OpenCircuits - User contributions [en]

Oscillator

2008-01-04T11:28:45Z

200.51.208.38: /* for further reading */

The vast majority of electronic systems operate at some fixed frequency.
Usually the component that fixes that frequency is a quartz crystal, sealed in a metal can.
(Some very-low-cost devices might use a "ceramic resonator" (made of high-stability piezoelectric ceramics, generally lead zirconium titanate)or a resistor and a capacitor to fix the frequency. ).

The entire circuit that generates the frequency is called an "oscillator", includes the resonant part (crystal, resonator, or RC), some capacitors, and a silicon chip and therefore is called a hybrid device.
(An oscillator that uses a resistor and a capacitor to fix the frequency is called a "RC oscillator".
An oscillator that uses a crystal to fix the frequency is called a "crystal oscillator".)

The oscillator includes, in addition to the frequency-fixing component just mentioned, an amplifier and capacitors.

Oscillators usually come in a metal can, but Epson also encapsulates them in plastic. Typically an oscillator can has 4 pins. Inside the can is all the components of the oscillator. One applies DC power on 2 of the pins, and the oscillating signal (the "CLK OUT") appears on another pin. (The remaining pin is unused).

An oscillator can also be made from scratch using crystal in a (2-pin) metal can, a couple of capacitors, an resitor and an inverter.
In either case, the frequency is printed on the top of the crystal or oscillator.

Many microcontrollers have 2 pins (typically labeled "XTAL1" and "XTAL2", or "OSC1" and "OSC2", or something similar)
that are designed to be directly connected to the 2 pins of a crystal.
(Capacitors from those pins to VCC and GND are also part of the recommended circuit).
An inverter inside the microcontroller acts as the amplifier, and the crystal and capacitors make up the rest of the oscillator. Microcontrollers when connected directly to a crystal need to have capacitors attached that need to be percisely matched with other circuit components on the board. Resonators tend to have the capacitor buildin reducing the amount of trial and error of capacitor selection.

In systems with multiple CPUs, it is often simpler, cheaper, and more reliable (avoiding metastability problems) to use a single crystal (rather than a dedicated crystal for each CPU).
CPUs (and many other components) often have a single "CLK" pin designed to be connected to the wire used to send that "clock signal" (a fixed frequency) everywhere.

Unfortunately, many people confuse the "clock signal" generated by an oscillator (a simple metronome beat, tone, at constant frequency) with far more complicated "clock system"s that keep track of seconds, minutes, hours, and sometimes days, weeks, months, and years.

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2008-01-04T06:20:04Z

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This project is the building of an external USB amiga floppy drive controller. It sits between the USB port on a Windows PC, and a regular PC floppy drive. It will allow the PC to create .ADF images from an amiga floppy disk. This device is based on a Parallax SX28 microcontroller, uses Ramtron FRAM memory for temporary track storage, and uses another Parallax component for the USB interface.

[[Image:AFPimage.jpg]]

== related projects ==

* [[Minimig]], an open source exact FPGA re-implementation of an Amiga 500.

== External links ==

[http://www.techtravels.org/amiga/amigablog Amiga Floppy Project Blog]

[http://www.parallax.com/sx/index.asp Parallax SX Microcontroller]

[http://www.ramtron.com/doc/Products/Nonvolatile/Detail.asp?ID=30

LT1114

2008-01-04T06:18:13Z

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LT1114 - Dual/Quad Low Power Precision, Picoamp Input Op Amps

http://www.linear.com/pc/images/products/thumbnails/1365.jpg

Datasheet: http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1154,C1009,C1100,P1365,D1714

Availability:
* Free samples: http://www.linear.com/samples/orderSamples.do?navId=H0,C1,C1154,C1009,C1100,P1365
* Digikey: http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=9250

File:Dang symbol.png

2008-01-04T04:28:36Z

200.51.208.38: acelpa

lidelere
Danger symbol. Used as a symbol for punctuation of layouts.

OpenCircuits:Community portal

2008-01-04T04:27:28Z

200.51.208.38: eltrogetsitz

getacel
Welcome to Open Circuits.
This is a good place to talk about Open Circuits, as a whole.

We have {{NUMBEROFARTICLES}} articles now. Yay!

== Anti-Vandalism Bot ==
It is my opinion that this should be the top goal for this site to accomplish.

: ''We recently updated the $wgSpamRegex ( http://www.mediawiki.org/wiki/Manual:%24wgSpamRegex ). It should block nearly all of the kinds of spam we've been seeing in the past. (Use [[Meta:Sandbox]] for testing). --[[User:DavidCary|DavidCary]] 08:46, 6 June 2007 (PDT)''
::The problem is, that this is not a one time thing. It must be updated regulary, so it also works for new kinds of spam --SebDE

Seeing a lot of stubborn spammers. Can we implement some kind of ip blocking mechanism?, that blocks repeated spam ip's for a week or so. Here's a list of known [[spammer ip]].
:Blocking based on IPs might be usefull if it uses a maintained black or gray list, but the kind of IP blocking is used around here doesn't help much. --SebDE

Disabling edits from users that aren't logged in might help a lot: http://www.mediawiki.org/wiki/Manual:Faq#How_can_I_prevent_editing_by_anonymous_users.3F --[[User:Mzandrew|Mzandrew]] 14:16, 8 September 2007 (PDT)
:[[User:DavidCary|DavidCary]] wrote: "We want a system in a way that makes it very easy for anyone to help us." on his User Discussion page.
:But it wouldn't hurt if the creation of new sites would be logged in users only. (Would reduce the need to delete certain articles over and over again) --SebDE

Or if someone's not logged in, could we enable a captcha so that the spammers would at least have to do it manually?
Here's the ReCAPTCHA extension for mediawiki sites: http://www.mediawiki.org/wiki/Extension:ReCAPTCHA
There's also the ConfirmEdit extension. http://www.mediawiki.org/wiki/Extension:ConfirmEdit
--[[User:Mzandrew|Mzandrew]] 13:38, 9 September 2007 (PDT)
:That is way to overdesigned if you know what I mean. And just btw it is hell for accessibility. I would rather see the use other techniques like wgSpamRegex and the use of a maintained IP black list first before using such ugly things... --SebDE

::Obviously other methods are not working, I think captcha could be a hell for accessibility, but it is only when editing. I think is much worst for accesibility the incredible amount of spam that is attacking the wiki than captcha (think seriously about it)[[User:Garrocha|Garrocha]] 10:43, 27 December 2007 (PST)

I have a whole bunch of PIC projects and things I think I can do to contribute to this Wiki, but the spam here is way way out of control. I'm looking at the change logs and I'm seeing 20+ spam edits per day. I'm not so sure I want to contribute if my contributions are going to be destroyed in a matter or days. I think requiring a logon to make changes would cut out most of the spam. At this point, the problem is so bad that making things alittle harder for people to make changes is probably worth the benefits.

Also, this isn't directly related to spam, but it would be nice if the site didn't put nofollow on all the URLs. I think more people would be willing to add project info pages to the wiki if they new it would make them more visable in search engines. The wiki is small enough at this point that if people start abusing this it would be easy to ban or delete their account( assuming the change is made to require a login to make edits)
[[User:Mzoran|Mzoran]] 21:42, 14 October 2007 (PDT)

== electrical mailing lists ==
Yahoo claims they have
[http://dir.groups.yahoo.com/dir/Science/Engineering/Electrical 1,831 electrical engineering mailing lists].
What would be a good way of letting the people on those lists know about the Open Circuits wiki, without spamming them?
--[[User:DavidCary|DavidCary]] 13:30, 31 May 2006 (PDT)

* Publish cold fusion howto :-)
* Send one email/week and only once per list. And be on topic, listen carefully for responses.
[[User:Freqmax|Freqmax]] 16:24, 30 July 2007 (PDT)

== about Open Circuits ==
So, is there any connection between http://OpenCircuits.org/ , http://OpenCircuits.net/ , and this http://OpenCircuits.com/ wiki?
--[[User:DavidCary|DavidCary]] 23:47, 13 June 2006 (PDT)

No. There is no connection between any of http://opencircuits.com and the other websites listed.
[[User:Chazegh|Chazegh]] 02:55, 18 June 2006 (PDT)
== web rings ==
Document an original microcontroller project and join a PIC webring, or AVR webring. 20 June 2006

== audio electronics ==

Is there some other wiki for people to talk about audio electronics?
Or is this Open Circuits the best wiki for talking about things like
''"[http://analog.com/ Analog Devices] AN-221: The Alexander current-feedback audio power amplifier"'' by Mark Alexander
?

I think I would prefer to offload all the audio electronics controversies to some other wiki
(but which one?).
Still, it would be nice to have some "tips for high-power electronics" here.
I imagine that tips page would list the various quirks of high-power MOSFETs, BJTs, TRIACs, and IGBTs,
and (given a particular motor or speaker or other load)
how to select one over the others,
and various ways of working around those quirks.
--[[User:65.70.89.241|65.70.89.241]] 07:17, 10 August 2006 (PDT)

I just joined Open Circuits. I have been servicing and designing audio equipment for several years (Recording consoles a specialty) I hope you will have a section for audio electronics. I also work with video projection systems and theatrical lighting (stage struck at an early age) I play electric rock-blues guitar, so I also am interested in tube guitar amps (Marshall and Boogie). And there is a big difference in what a guitar player thinks an amp should do, and what a recording engineer wants an amp for. I think these are valid points for discussion.
I've also got an interest in power supplies (my experience is mostly with linear, but I've started learning about switching designs). In fact that brings me to my question, I have some regulator designs based on the 723 that I'd like to share. How do I go about doing that? I built a replacement for a console /- 18V @6A supply when I couldn't find the original regulator devices. I used 723s with external series pass devices. The unit has been working for close to 10 years now, so I think the design is worth sharing. Is anyone interested?

I also research discrete op amps like the Jensen 990. I've been working (on and off for years) on a clone of that using more modern, easily available parts and devices. Anyone else?
Finally, in response to the first entry in this section, I too read that application note in Analog Devices Audio/Video Reference Manual. My copy is dated 1992. I've repaired a lot of amplifiers, but haven't built any. If anyone else is hip to this amp I'd like to hear about it. It is a very unique design. I also like the A75 amp design from Nelson Pass and Norman Thagard, and the Leach Amp by Marshall Leach. The last two are pretty normal as far as design goes, not as adventurous as the Alexander with its current-feedback approach.
Aloha, RAF--[[User:66.8.194.185|66.8.194.185]] 14:04, 18 May 2007 (PDT)

== automotive electronics ==

Is there some other wiki for people to talk about automobile electronics?
Or is this Open Circuits the best wiki for talking about things like
[http://megamanual.com/ "experimental Do-It-Yourself programmable electronic fuel injection controller"]?
Or should we just point people who want to talk ECUs (engine control units) to the
[http://msefi.com/ MSEFI discussion forum],
even though it sadly lacks a wiki?
--[[User:DavidCary|DavidCary]] 22:36, 2 July 2007 (PDT)

== inviting bloggers to open circuits ==

=== how to connect a JTAG probe to a Nokia phone ===

I'd like to invite bloggers such as GyrosGeier to edit OpenCircuits.
Rather than just spamming him, I think he would be more inclined to help out
if we answered one of his questions first -- such as
[http://hogyros.de/?q=node/167 "If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."]
Maybe I should start a page on [[JTAG]]...
--[[User:DavidCary|DavidCary]] 09:37, 22 September 2006 (PDT)

The [http://hackedgadgets.com/ Hacked Gadgets blog also has a bunch of cool electronics].
--[[User:DavidCary|DavidCary]] 11:58, 5 January 2007 (PST)

== red links ==

The default skin at OpenCircuits currently has "red links" = page exists, "dark red links" = page does not exist.

I find that confusing. (But not as bad as the wiki that has some links black-on-white, indistinguishable from normal text).

'''work-around''': Register (it's free, and you don't have to give any personal information), then choose the "preferences" link in the far upper-right corner and then pick any other skin.

The other skins have coloring that you may be more used to from other wiki: "blue links" = page exists, "red links" = page does not exist.

--[[User:DavidCary|DavidCary]] 08:58, 18 December 2006 (PST)

*** Guys, the red color on links is AwuFul, it brings ppl headaches.
That's the only reason I cant participate ***

--[[User:Takeda|Takeda]] 16:38, 29 September 2007 (PDT)

== inviting people from other forums to open circuits ==

Lots of people talk about circuits for LED lighting at
http://candlepowerforums.com/
.
Perhaps we can talk some of them into contributing here -- perhaps using a page or two of Open Circuits as a FAQ for LEDs and drive circuits.

== tool lists ==

Should we have an entire page on "tools", and mention it on the main page?
That risks listing *every* tool anyone has ever heard about,
like the page at
http://massmind.org/techref/tools.htm
.
Yes, I'm responsible for uglier bits on that page;
I think the wide variety of oscilloscopes are particularly confusing.
How could we cut through the confusion?

I see the "techniques" page already has a list of software tools.
Perhaps it would be nifty to have a short list of all the tools necessary for each technique?
Then a beginner would have a better idea of what tools he really needs to get (rather than looking at a huge list of every tool, and wondering for each one, ''"Am I going to regret buying it when I see it gathering dust? Or am I going to regret not buying it when I need it during a midnight debug session?"'').

--[[User:DavidCary|DavidCary]] 08:37, 24 January 2007 (PST)

== Requests For Help ==
Thanks for your help with the camcorder mic.

== sample component ==

What is the purpose of the [[Sample Component]] ?
--[[User:DavidCary|DavidCary]] 16:27, 7 May 2007 (PDT)

----

== current surge and battery life ==

Hi,

currently my board is using a 3V battery, in every 40msec it will turn on its RF to communicate with the base station. I face a problem here is that my battery life is badly affected. Turning on the RF with cause a current surge.

Will this surge affect my battery life? If I use a supercapacitor does it helps?

-- [[User:203.120.164.208]] 04:14, 30 April 2007

== MIDI electrical interface ==

In my opinion, the MIDI interface got a lot of things right that too many later interfaces still trip over.

* http://www.repairfaq.org/filipg/LINK/F_MIDI.html -- ASCII schematics
* http://www.engadget.com/2005/08/30/how-to-control-csound-with-a-custom-midi-controller-hardware/ -- hand-sketched schematics
* http://www.midi.org/about-midi/electrical.shtml "MIDI Electrical Specification Diagram & Proper Design of Joystick/MIDI Adapters" -- well-drawn schematics
* [http://en.wikipedia.org/wiki/The_MIDI_1.0_Protocol Wikipedia: The MIDI 1.0 Protocol]
* http://en.wikibooks.org/wiki/Behringer_FCB1010_MIDI_Pedal

It may look simple, but too often people try to "improve" it by adding or removing things without understanding, ending up with a worse system.

Is there any other wiki that is more appropriate for explaining the low-level details of the MIDI electrical interface, and *why* it was done that way?

I would be most interested in discussing new communication interfaces -- but is this really the right wiki?
Or would http://en.wikibooks.org/wiki/Serial_Programming or the [http://interwiki.sourceforge.net/cgi-bin/picawiki.pl/StartingPoint PICA wiki] be better for discussing improvements?
--[[User:DavidCary|DavidCary]] 13:21, 21 June 2007 (PDT)

== IC design ==

What do you think about
http://makeyourownchip.com/
?
Should we talk about VLSI design ([http://david.carybros.com/html/vlsi.html "VLSI: designing electronic chips"])
here at Open Circuits?
Or is there a more appropriate wiki somewhere else?
--[[User:DavidCary|DavidCary]] 15:59, 26 June 2007 (PDT)

== electronics infoline ==

So have you seen
"Free electronics projects"
http://electronicsinfoline.com/
"with Photo Preview"
?
--[[User:DavidCary|DavidCary]] 00:28, 1 July 2007 (PDT)

== generating a netlist with a "C++" program ==

The [http://positron.ps.uci.edu/~pier/csc/sup/Support.html "Support Electronics for ATLAS Muon CSC"] documentation claims that [http://positron.ps.uci.edu/~pier/csc/sup/CRB_LayoutNotes0.pdf "The design was captured with C++. There are no schematics."] and lists [http://positron.ps.uci.edu/~pier/csc/sup/crb_srce the C++ source code].

How did they do that?
--[[User:DavidCary|DavidCary]] 01:15, 3 July 2007 (PDT)

== rocket electronics ==

Is there another wiki that talks about rocket electronics?
Or is this Open Circuits the best place to talk about
ground support electronics
(such as [http://www.ukrocketman.com/rocketry/controller.shtml Launch Controller]s)
and
onboard electronics
(such as one
[http://www.ukrocketman.com/rocketry/compactrdasguide.shtml flight computer]
or another
[http://david.carybros.com/html/schematic.html#flight_computer flight computer]
)?
--[[User:DavidCary|DavidCary]] 14:21, 15 July 2007 (PDT)

== Minimig ==
I have created pages about the [[Minimig]] project which is running an Amiga 500 in a Xilinx FPGA. It's rather a work in progress, than a static documentation. I hope nobody minds. [[User:Freqmax|Freqmax]] 18:35, 27 July 2007 (PDT)

== Open Science ==

So does/should Open Science ( http://openscience.org/ ) have any relation to Open Circuits ?
--[[User:68.0.120.35|68.0.120.35]] 00:13, 5 August 2007 (PDT)

== LaTEX math markup ==

I wrote a quick howto on figuring out resistor values, but it looks bad without latex math markup enabled.
Here's what I wrote as it appears on open circuits: http://www.opencircuits.com/Talk:Relays
Here's how it appears on wikipedia (with math markup enabled): http://en.wikipedia.org/wiki/User:Mzandrew/Sandbox

Anyone know if this is a quick thing to enable for open circuits or if it's involved?

[[User:Mzandrew|Mzandrew]] 14:16, 8 September 2007 (PDT)

----

'''SPAM DELETED!'''

I deleted a whole bunch of links that had been placed at the top of this page, probably by the same AH that did it to my page. I think the best solution would be to make it so no edits are possible without being logged in. Then there will be a record of who does this kind of thing. Then they can be banned from the site. I don't think that defeats the purpose of an open wiki environment, it simply means you have to register to contribute.

--[[User:RogerAF|RAF]] 10:30, 21 December 2007 (PST)

At least this page is still OK. The Spam AHole hit my user talk page again today. This is very aggravating.

--[[User:RogerAF|RAF]] 06:54, 22 December 2007 (PST)

: ''I agree. Annoying. I'm starting to "semi-protect" most pages so they can only be edited by logged-in users. I'm leaving a couple of pages wide open as a honeypot and/or test pages, so I can make tests and ban spammers without touching good pages. I think the $wgSpamRegex and/or ReCAPTCHA would be a better way to deal with spam. But my attempt to set them up isn't working yet. Sorry. --[[User:DavidCary|DavidCary]] 10:28, 3 January 2008 (PST)''

Toaster oven

2008-01-04T04:26:12Z

200.51.208.38: monoutrcadar

oloorcac
{{stub}}

Toaster oven reflowing:

Using The Silicon Horizon Inc's techFX reflow controller, you can have a standalone setup (with lcd and keypad) or use it through your USB port with windows software. The LCD and keypad are optional items.

It uses a K-type thermocouple and amplifier to take readings from a hacked toaster oven. It controls the toaster oven using a modified PID algorithm with software adjustable PID gains through the windows application.

The windows application can program PID gains, setup a keypad, and store profiles on the controller for later use or keypad use. The windows software also shows realtime graphing of the temperature curve.

The manual is pretty decent, it has pictures detailing the entire test setup and hacking a black and decker lightwave oven. IR ovens are recommended as is the lightwave oven (~1300 watts).

It is strongly suggested that you use a solid state relay, and an extra breaker on the plug in the back to plug the oven into the controller (available at home depot). that way if something goes wrong with the oven, then the breaker will trip and hopefully nothing catches fire :)

----

Some people claim that [[skillet reflow | electric skillets ]] are better than toaster ovens for reflowing PCBs full of electronic components.

== External links ==

* [http://thesiliconhorizon.com/ "techFX reflow controller" ] designed to convert a toaster oven into an SMD reflow oven. Based on a Microchip 18f4550 MCU.
* [http://ArticulationLLC.home.comcast.net/sm0402.htm "You, too, can do 0402!"] by Bill Shaw ( http://ArticulationLLC.home.comcast.net/sm0402.htm ). The title is kind of toungue-in-cheek. While you can do 0402 SMT work at home, it takes much patience and a steady hand. 0805's on the other hand are pretty easy once you get used to them. Email if you have any questions. hth, Bill (bill (at) ArticulationLLC.com) http://www.ArticulationLLC.com .
* [http://openhardware.net/Misc_Stuff/ToasterSMD/ Toaster Oven SMD] -- illustrated step-by-step details. Claims that toaster ovens are better than [[hotplate]]s.

[[Category:Techniques]]

OpenCircuits:Community portal

2008-01-04T00:50:57Z

200.51.208.38: varbasv

monlabasr
Welcome to Open Circuits.
This is a good place to talk about Open Circuits, as a whole.

We have {{NUMBEROFARTICLES}} articles now. Yay!

== Anti-Vandalism Bot ==
It is my opinion that this should be the top goal for this site to accomplish.

: ''We recently updated the $wgSpamRegex ( http://www.mediawiki.org/wiki/Manual:%24wgSpamRegex ). It should block nearly all of the kinds of spam we've been seeing in the past. (Use [[Meta:Sandbox]] for testing). --[[User:DavidCary|DavidCary]] 08:46, 6 June 2007 (PDT)''
::The problem is, that this is not a one time thing. It must be updated regulary, so it also works for new kinds of spam --SebDE

Seeing a lot of stubborn spammers. Can we implement some kind of ip blocking mechanism?, that blocks repeated spam ip's for a week or so. Here's a list of known [[spammer ip]].
:Blocking based on IPs might be usefull if it uses a maintained black or gray list, but the kind of IP blocking is used around here doesn't help much. --SebDE

Disabling edits from users that aren't logged in might help a lot: http://www.mediawiki.org/wiki/Manual:Faq#How_can_I_prevent_editing_by_anonymous_users.3F --[[User:Mzandrew|Mzandrew]] 14:16, 8 September 2007 (PDT)
:[[User:DavidCary|DavidCary]] wrote: "We want a system in a way that makes it very easy for anyone to help us." on his User Discussion page.
:But it wouldn't hurt if the creation of new sites would be logged in users only. (Would reduce the need to delete certain articles over and over again) --SebDE

Or if someone's not logged in, could we enable a captcha so that the spammers would at least have to do it manually?
Here's the ReCAPTCHA extension for mediawiki sites: http://www.mediawiki.org/wiki/Extension:ReCAPTCHA
There's also the ConfirmEdit extension. http://www.mediawiki.org/wiki/Extension:ConfirmEdit
--[[User:Mzandrew|Mzandrew]] 13:38, 9 September 2007 (PDT)
:That is way to overdesigned if you know what I mean. And just btw it is hell for accessibility. I would rather see the use other techniques like wgSpamRegex and the use of a maintained IP black list first before using such ugly things... --SebDE

::Obviously other methods are not working, I think captcha could be a hell for accessibility, but it is only when editing. I think is much worst for accesibility the incredible amount of spam that is attacking the wiki than captcha (think seriously about it)[[User:Garrocha|Garrocha]] 10:43, 27 December 2007 (PST)

I have a whole bunch of PIC projects and things I think I can do to contribute to this Wiki, but the spam here is way way out of control. I'm looking at the change logs and I'm seeing 20+ spam edits per day. I'm not so sure I want to contribute if my contributions are going to be destroyed in a matter or days. I think requiring a logon to make changes would cut out most of the spam. At this point, the problem is so bad that making things alittle harder for people to make changes is probably worth the benefits.

Also, this isn't directly related to spam, but it would be nice if the site didn't put nofollow on all the URLs. I think more people would be willing to add project info pages to the wiki if they new it would make them more visable in search engines. The wiki is small enough at this point that if people start abusing this it would be easy to ban or delete their account( assuming the change is made to require a login to make edits)
[[User:Mzoran|Mzoran]] 21:42, 14 October 2007 (PDT)

== electrical mailing lists ==
Yahoo claims they have
[http://dir.groups.yahoo.com/dir/Science/Engineering/Electrical 1,831 electrical engineering mailing lists].
What would be a good way of letting the people on those lists know about the Open Circuits wiki, without spamming them?
--[[User:DavidCary|DavidCary]] 13:30, 31 May 2006 (PDT)

* Publish cold fusion howto :-)
* Send one email/week and only once per list. And be on topic, listen carefully for responses.
[[User:Freqmax|Freqmax]] 16:24, 30 July 2007 (PDT)

== about Open Circuits ==
So, is there any connection between http://OpenCircuits.org/ , http://OpenCircuits.net/ , and this http://OpenCircuits.com/ wiki?
--[[User:DavidCary|DavidCary]] 23:47, 13 June 2006 (PDT)

No. There is no connection between any of http://opencircuits.com and the other websites listed.
[[User:Chazegh|Chazegh]] 02:55, 18 June 2006 (PDT)
== web rings ==
Document an original microcontroller project and join a PIC webring, or AVR webring. 20 June 2006

== audio electronics ==

Is there some other wiki for people to talk about audio electronics?
Or is this Open Circuits the best wiki for talking about things like
''"[http://analog.com/ Analog Devices] AN-221: The Alexander current-feedback audio power amplifier"'' by Mark Alexander
?

I think I would prefer to offload all the audio electronics controversies to some other wiki
(but which one?).
Still, it would be nice to have some "tips for high-power electronics" here.
I imagine that tips page would list the various quirks of high-power MOSFETs, BJTs, TRIACs, and IGBTs,
and (given a particular motor or speaker or other load)
how to select one over the others,
and various ways of working around those quirks.
--[[User:65.70.89.241|65.70.89.241]] 07:17, 10 August 2006 (PDT)

I just joined Open Circuits. I have been servicing and designing audio equipment for several years (Recording consoles a specialty) I hope you will have a section for audio electronics. I also work with video projection systems and theatrical lighting (stage struck at an early age) I play electric rock-blues guitar, so I also am interested in tube guitar amps (Marshall and Boogie). And there is a big difference in what a guitar player thinks an amp should do, and what a recording engineer wants an amp for. I think these are valid points for discussion.
I've also got an interest in power supplies (my experience is mostly with linear, but I've started learning about switching designs). In fact that brings me to my question, I have some regulator designs based on the 723 that I'd like to share. How do I go about doing that? I built a replacement for a console /- 18V @6A supply when I couldn't find the original regulator devices. I used 723s with external series pass devices. The unit has been working for close to 10 years now, so I think the design is worth sharing. Is anyone interested?

I also research discrete op amps like the Jensen 990. I've been working (on and off for years) on a clone of that using more modern, easily available parts and devices. Anyone else?
Finally, in response to the first entry in this section, I too read that application note in Analog Devices Audio/Video Reference Manual. My copy is dated 1992. I've repaired a lot of amplifiers, but haven't built any. If anyone else is hip to this amp I'd like to hear about it. It is a very unique design. I also like the A75 amp design from Nelson Pass and Norman Thagard, and the Leach Amp by Marshall Leach. The last two are pretty normal as far as design goes, not as adventurous as the Alexander with its current-feedback approach.
Aloha, RAF--[[User:66.8.194.185|66.8.194.185]] 14:04, 18 May 2007 (PDT)

== automotive electronics ==

Is there some other wiki for people to talk about automobile electronics?
Or is this Open Circuits the best wiki for talking about things like
[http://megamanual.com/ "experimental Do-It-Yourself programmable electronic fuel injection controller"]?
Or should we just point people who want to talk ECUs (engine control units) to the
[http://msefi.com/ MSEFI discussion forum],
even though it sadly lacks a wiki?
--[[User:DavidCary|DavidCary]] 22:36, 2 July 2007 (PDT)

== inviting bloggers to open circuits ==

=== how to connect a JTAG probe to a Nokia phone ===

I'd like to invite bloggers such as GyrosGeier to edit OpenCircuits.
Rather than just spamming him, I think he would be more inclined to help out
if we answered one of his questions first -- such as
[http://hogyros.de/?q=node/167 "If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."]
Maybe I should start a page on [[JTAG]]...
--[[User:DavidCary|DavidCary]] 09:37, 22 September 2006 (PDT)

The [http://hackedgadgets.com/ Hacked Gadgets blog also has a bunch of cool electronics].
--[[User:DavidCary|DavidCary]] 11:58, 5 January 2007 (PST)

== red links ==

The default skin at OpenCircuits currently has "red links" = page exists, "dark red links" = page does not exist.

I find that confusing. (But not as bad as the wiki that has some links black-on-white, indistinguishable from normal text).

'''work-around''': Register (it's free, and you don't have to give any personal information), then choose the "preferences" link in the far upper-right corner and then pick any other skin.

The other skins have coloring that you may be more used to from other wiki: "blue links" = page exists, "red links" = page does not exist.

--[[User:DavidCary|DavidCary]] 08:58, 18 December 2006 (PST)

*** Guys, the red color on links is AwuFul, it brings ppl headaches.
That's the only reason I cant participate ***

--[[User:Takeda|Takeda]] 16:38, 29 September 2007 (PDT)

== inviting people from other forums to open circuits ==

Lots of people talk about circuits for LED lighting at
http://candlepowerforums.com/
.
Perhaps we can talk some of them into contributing here -- perhaps using a page or two of Open Circuits as a FAQ for LEDs and drive circuits.

== tool lists ==

Should we have an entire page on "tools", and mention it on the main page?
That risks listing *every* tool anyone has ever heard about,
like the page at
http://massmind.org/techref/tools.htm
.
Yes, I'm responsible for uglier bits on that page;
I think the wide variety of oscilloscopes are particularly confusing.
How could we cut through the confusion?

I see the "techniques" page already has a list of software tools.
Perhaps it would be nifty to have a short list of all the tools necessary for each technique?
Then a beginner would have a better idea of what tools he really needs to get (rather than looking at a huge list of every tool, and wondering for each one, ''"Am I going to regret buying it when I see it gathering dust? Or am I going to regret not buying it when I need it during a midnight debug session?"'').

--[[User:DavidCary|DavidCary]] 08:37, 24 January 2007 (PST)

== Requests For Help ==
Thanks for your help with the camcorder mic.

== sample component ==

What is the purpose of the [[Sample Component]] ?
--[[User:DavidCary|DavidCary]] 16:27, 7 May 2007 (PDT)

----

== current surge and battery life ==

Hi,

currently my board is using a 3V battery, in every 40msec it will turn on its RF to communicate with the base station. I face a problem here is that my battery life is badly affected. Turning on the RF with cause a current surge.

Will this surge affect my battery life? If I use a supercapacitor does it helps?

-- [[User:203.120.164.208]] 04:14, 30 April 2007

== MIDI electrical interface ==

In my opinion, the MIDI interface got a lot of things right that too many later interfaces still trip over.

* http://www.repairfaq.org/filipg/LINK/F_MIDI.html -- ASCII schematics
* http://www.engadget.com/2005/08/30/how-to-control-csound-with-a-custom-midi-controller-hardware/ -- hand-sketched schematics
* http://www.midi.org/about-midi/electrical.shtml "MIDI Electrical Specification Diagram & Proper Design of Joystick/MIDI Adapters" -- well-drawn schematics
* [http://en.wikipedia.org/wiki/The_MIDI_1.0_Protocol Wikipedia: The MIDI 1.0 Protocol]
* http://en.wikibooks.org/wiki/Behringer_FCB1010_MIDI_Pedal

It may look simple, but too often people try to "improve" it by adding or removing things without understanding, ending up with a worse system.

Is there any other wiki that is more appropriate for explaining the low-level details of the MIDI electrical interface, and *why* it was done that way?

I would be most interested in discussing new communication interfaces -- but is this really the right wiki?
Or would http://en.wikibooks.org/wiki/Serial_Programming or the [http://interwiki.sourceforge.net/cgi-bin/picawiki.pl/StartingPoint PICA wiki] be better for discussing improvements?
--[[User:DavidCary|DavidCary]] 13:21, 21 June 2007 (PDT)

== IC design ==

What do you think about
http://makeyourownchip.com/
?
Should we talk about VLSI design ([http://david.carybros.com/html/vlsi.html "VLSI: designing electronic chips"])
here at Open Circuits?
Or is there a more appropriate wiki somewhere else?
--[[User:DavidCary|DavidCary]] 15:59, 26 June 2007 (PDT)

== electronics infoline ==

So have you seen
"Free electronics projects"
http://electronicsinfoline.com/
"with Photo Preview"
?
--[[User:DavidCary|DavidCary]] 00:28, 1 July 2007 (PDT)

== generating a netlist with a "C++" program ==

The [http://positron.ps.uci.edu/~pier/csc/sup/Support.html "Support Electronics for ATLAS Muon CSC"] documentation claims that [http://positron.ps.uci.edu/~pier/csc/sup/CRB_LayoutNotes0.pdf "The design was captured with C++. There are no schematics."] and lists [http://positron.ps.uci.edu/~pier/csc/sup/crb_srce the C++ source code].

How did they do that?
--[[User:DavidCary|DavidCary]] 01:15, 3 July 2007 (PDT)

== rocket electronics ==

Is there another wiki that talks about rocket electronics?
Or is this Open Circuits the best place to talk about
ground support electronics
(such as [http://www.ukrocketman.com/rocketry/controller.shtml Launch Controller]s)
and
onboard electronics
(such as one
[http://www.ukrocketman.com/rocketry/compactrdasguide.shtml flight computer]
or another
[http://david.carybros.com/html/schematic.html#flight_computer flight computer]
)?
--[[User:DavidCary|DavidCary]] 14:21, 15 July 2007 (PDT)

== Minimig ==
I have created pages about the [[Minimig]] project which is running an Amiga 500 in a Xilinx FPGA. It's rather a work in progress, than a static documentation. I hope nobody minds. [[User:Freqmax|Freqmax]] 18:35, 27 July 2007 (PDT)

== Open Science ==

So does/should Open Science ( http://openscience.org/ ) have any relation to Open Circuits ?
--[[User:68.0.120.35|68.0.120.35]] 00:13, 5 August 2007 (PDT)

== LaTEX math markup ==

I wrote a quick howto on figuring out resistor values, but it looks bad without latex math markup enabled.
Here's what I wrote as it appears on open circuits: http://www.opencircuits.com/Talk:Relays
Here's how it appears on wikipedia (with math markup enabled): http://en.wikipedia.org/wiki/User:Mzandrew/Sandbox

Anyone know if this is a quick thing to enable for open circuits or if it's involved?

[[User:Mzandrew|Mzandrew]] 14:16, 8 September 2007 (PDT)

----

'''SPAM DELETED!'''

I deleted a whole bunch of links that had been placed at the top of this page, probably by the same AH that did it to my page. I think the best solution would be to make it so no edits are possible without being logged in. Then there will be a record of who does this kind of thing. Then they can be banned from the site. I don't think that defeats the purpose of an open wiki environment, it simply means you have to register to contribute.

--[[User:RogerAF|RAF]] 10:30, 21 December 2007 (PST)

At least this page is still OK. The Spam AHole hit my user talk page again today. This is very aggravating.

--[[User:RogerAF|RAF]] 06:54, 22 December 2007 (PST)

: ''I agree. Annoying. I'm starting to "semi-protect" most pages so they can only be edited by logged-in users. I'm leaving a couple of pages wide open as a honeypot and/or test pages, so I can make tests and ban spammers without touching good pages. I think the $wgSpamRegex and/or ReCAPTCHA would be a better way to deal with spam. But my attempt to set them up isn't working yet. Sorry. --[[User:DavidCary|DavidCary]] 10:28, 3 January 2008 (PST)''

Supplier

2008-01-03T22:24:00Z

200.51.208.38: aczelrol

sittabassit
Even if you can find the perfect part, sometimes you can't find anyone who is willing to sell you one. Here is some information on [[components|component]] suppliers.

== Giant Catalogs ==

[[Image:Digikey-Logo.gif|150px|Digikey]] [[Digikey]]
[[Image:Mouser-Logo.png|150px|Mouser]] [[Mouser]]
[[Image:Farnell_logo.gif|150px|Farnell]] [[Farnell]]

These guys have huge catalogs and an immense selection of parts, yet are still willing to sell things in onseies-and-twosies to hobbyists who can't claim to be prototyping something that'll sell a million units next year. Digi-Key actually got its start in the ham radio market, selling digital keyers.

I ([[Wiml]]) find that Digi-Key is the place to go for digital stuff, microcontrollers, and the like. For discretes and analog parts, Mouser is usually cheaper and has a better selection. Neither company has a minimum order, but of course they do have shipping and handling fees which make small orders impractical.

I, myself (who?) appear to have found that [[Jameco]] is good for small quantities of a fairly common part. They don't have anything surface mount, though. For that stuff, I had to go to Digi-Key. I called up Digi-Key to see if I could alter an order I had just placed before it got fulfilled. My order was already far enough along that they couldn't stop it. I believe the phrase was "too far gone". That speaks well of their order fulfillment process. I hear Mouser should be in there too, but I've never had a compelling reason to use them.

== Mid-size Suppliers ==

http://www.alliedelec.com/Images/logo_allied.png
[http://www.alliedelec.com/ Allied Electronics]
Honestly I'm not sure if this is a mid-size or large distributor (how are we to tell, anyway?) Allied tends to deal more with "heavy duty" electrical parts (wiring, relays, electromechanical, etc. . .) rather than electronics. However, I've noticed that they do have some suppliers that Mouser/DigiKey don't have in terms of electronics components.

http://www.newark.com/images/en_US/logo_nio.gif
[http://newark.com/ Newark]
My most recent "Newark in one" catalog is even thicker than my most recent Digikey catalog. ''(The "in one" motto and the swirly logo look identical to the Farnell logo. Is there some kind of connection?)''

Newark usually has just about every odd semiconductor you might need in stock. Their shipping tends to be rather expensive, however (be prepared, as they won't give you a shipping quote until after you order, just like every other distributor), and they seem to really not like small orders, in my experience.

Newark InOne, Farnell InOne, and MCM InOne are all electronics distributors owned by the InOne Company.

http://www.jameco.com/wcsstore/Jameco/images/jamecoLogo.gif
[http://jameco.com/ Jameco]
[[Jameco]]'s catalogs have been getting fatter recently and their prices are good for common parts. Their Jameco ValueBrand parts are often much cheaper than the competition. (I have yet to notice the difference, personally -mdwebster) Jameco tends to focus on generic and older parts, where the giant supplier tend to focus on newer brand name parts. Jameco has a decent selection of cheap tools.

Radio Shack is OK if you need a common part NOW, but expect to pay probably 10 times the mail order price. In the past couple of years (2005-2006), I've noticed many Radio Shacks have ceased carrying ANY electronics parts. You're most likely to find solder, wire, switches, led's, and project boxes. The selection of transistors or IC's are poor to nonexistent.
If you have a Fry's in your area, they have a much better selection, but their component prices are not much better then RS. Unless you need a part immediately, you'll be much better off getting it mail order.

Pricewatch is good for locating certain computer gear at its version of the best price. Froogle is sort of the same thing, but without the seedy side filtered out.

== Smaller and niche suppliers ==
[[Action Electronics]] (http://www.action-electronics.com/) Good place for soldering suppies, hand tools, small components.

[[All Electronics]] (http://www.allelectronics.com) Corp. needs to even out their stuff a bit. Either specialize in a few types of parts or be more even across the board. Spark Fun Electronics appears to be trying to do it right. It is still weird that I can't just order a bunch of 0603 resistors from them. Seems like a no-brainer.

[[Alltronics]] (http://www.alltronics.com/) is similar to All Electronics in what they carry. Fairly sure they're different companies with annoyingly similar names.

[[American Science and Surplus]] (http://www.sciplus.com/) has a little bit of everything. Rubber spiders, speakers, prisms, lab equipment, electromechanical timers, Slinkies, motors, switches, fake vomit, glow-in-the-dark pencils, radio-controlled toy rats... Good selection of fans and motors, and an oddball attitude to boot. If you're near Chicago, their retail store is even weirder.

American Science & Surplus
[http://www.sciplus.com/recommend.cfm?recommendid=11013&jump=index%2Ecfm%3Fstart%3D1 seems to have good prices on breadboards].

[[Electronics Goldmine]] (http://www.goldmine-elec.com/) is another surplus warehouse. Don't expect to find any particular part, but they have good prices on what they do carry.

[[Futurlec.com]] (http://www.futurlec.com) I've been very happy with Futurlec. Their prices are outstanding, especially on value packs. Their customer service isn't stellar, but in the end they've always resolved any problems that I've had. They ship from Australia/Thailand, but their shipping prices are reasonable & the shipping is quick enough.

[[Logical Systems]] (http://www.logicalsys.com/) IC Programming addapters. Surface Mount to DIP, many more than I thought there were.

[[microcontrollershop.com]] (http://microcontrollershop.com) - Large selection of development boards, programmers, debuggers for microcontroller projects. All major architectures ARM, 8051, PIC, Atmel AVR, TI MSP430, Freescale HC08, HC12, etc.

[[MPJA.com]] (http://www.mpja.com) - prototyping tools, components. Not a huge selection, but prices are low. If you order something that comes with an instruction sheet that was translated into English, the directions may be hard to decipher due to poor translation, possibly from Chinese. They ship from Florida.

[[Surplus Sales]] (http://www.surplussales.com/) more exotic surplus parts.

[[Surplus Shed]] (http://www.surplusshed.com/) carries a some electronics and lots of optics. (Prisms, microscopes, etc)

[[Adafruit Industries]] (http://www.adafruit.com/) DIY kits and AVR programmers. Their open source AVR programmer usbtinyusb is especially recommended. Ok service and shipping.

[[Fastcomponents]] (http://www.fastcomponents.co.uk/) They only have packs, but the packs are good value.

[[Sparkfun]] (http://www.sparkfun.com) Specializes in microcontrollers and robotics. They also have nice AVR tutorials.

[[TVI Electronics]] (http://www.tvielectronics.com) Manufacturer of intelligent LCD controllers for Optrex F-51320, F-51553, F-51852 and F-51854 displays, worldwide supplier of touch screens and touchscreen controllers.

== PCB manufacturers ==

For companies that supply a PCB customized to your design, see [[PCB Manufacturers]].

== Comments ==

I want to see some competition in the micro dev/app board market. I just paid approximately 34.95 + its share of the shipping for a 32 bit ARM microcontroller on a PCB and with a USB device port on one end and a series of header sockets on the other. If that is considered cheap, then this is never going to take off.

I realize that other authors will have different opinions than I, and that this entry is probably not going to remain as it is for long. Come on, everybody. These comments do not reflect the opinions of Open Circuits. They are only my own. Add yours.

I personally stay away from app boards unless I absolutely need to use them because of the price. Also the components tend to not be in sockets, so if you blow a pin or two on that $100 app board, you need to replace the entire board as opposed to a $5 microcontroller. Unfortunatly, many of the better parts are only available in SMT packages. [[User:Mzoran|Mzoran]] 15:30, 16 December 2007 (PST)

Competition?
I see that there is a different [http://parallax.com/Store/Microcontrollers/PropellerDevelopmentBoards/tabid/514/CategoryID/73/List/0/Level/a/ProductID/423/Default.aspx?SortField=ProductName%2cProductName 32 bit microcontroller on a PCB for $20 + shipping]. It has a SMT microcontroller, but I see the same microcontroller is also available in a DIP package for easy solderless-breadboard prototyping.
--[[User:DavidCary|DavidCary]] 22:51, 30 December 2007 (PST)

----

I've had great experiences with [[Mouser]] and [[Jameco]] for smallish orders (<$200). I've also had several good experiences with [[SparkFun]]. I now avoid Fry's. In addition to their horrible return policies, their stock is very random and prices aren't very good.

----

My personal experiance with Surplus Sales was very good. I would highly recommend them for anyone that needs a blower motor, hydraulic pump, etc. Good prices, good service.

----

IguanaLabs ( http://www.iguanalabs.com/ ) seems to be very hobbyist-friendly. They have a very small selection of parts, but it includes the lowest-cost [[breadboard]]s I've seen.

Please note that IguanaLabs will be closing its doors for good on August 11th, 2007.

----

See also the list at http://techref.massmind.org/techref/supplies.htm .

----

Don't forget to check [http://www.ebay.com ebay] if you're looking for fairly generic items. There are a number of suppliers that ship cheap components from China, plus a few who ship from within the US. I've gotten great prices on character LCD displays, pin headers, SMD LEDs, and PIC microcontrollers, among others.

[http://ledshoppe.com/ ledshoppe] has good prices on LEDs (all pin-through-hole). They don't have any other components, but they do have dirt cheap bluetooth dongles and SD card readers that may be of interest. Shipped from China, shipping is free. Usually arrives in the US in about a week, never had a problem with them.

----

Should comments be moved to discussion and a consensus formed around factual information regarding suppliers?

== other supplier reviews ==

* [http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Suppliers LinuxCNC: Suppliers]

[[category:suppliers]]

User:DavidCary

2008-01-03T22:22:09Z

200.51.208.38: cnanolanov

roltach
Welcome to my little corner of Open Circuits.

I think I first stumbled across Open Circuits on 2006-03-01.
I had been starting to set up a electronics-related wiki,
but since this one was already here, why bother?

Feel free to leave a note on [[User_talk:DavidCary|my talk page]].

I created the [[WikiNode]].

Electronic projects:
''(Should I move these to dedicated pages such as [[electronics workbench]], etc.?)''

== electronics workbench ==

What exactly do I need for "normal" electronics development?
I have a pile of stuff, and I have a wishlist of more stuff ...
I hope to document which things are important to have, which things are useful but not immediately necessary, and which things ended up just gathering dust.

I wish there were a place like [http://blog.guykawasaki.com/2007/09/techshop-geek-h.html TechShop] somewhere local.

* filing cabinet for all the miscellaneous bits of paper. If at all possible, I attach instruction manuals to the actual tool -- but if that is awkward, I stick the instruction manual in this filing cabinet.

== data collection network ==

I'm building a "data collection network" that may end up with hundred of microcontroller sensor nodes,
piping data into a PC.
This may turn into a serious medical diagnosis tool.

== POV display ==

''(moved to [[POV display]])''

== Full-color LED lighting ==

I'm planning to build a silly little toy with 3 LEDs -- one for red, green, and blue --
to show how "additive colors" work (a "color wheel").
(I might just extend it to have a whole spectrum of visible and infrared LEDs, and a prism to show the little spikes in the spectrum that LEDs generate).

"Red, Green, and Blue LED based white light generation"
by Muthu, Schuurmans, and Pashley (2002)
http://www.advancetransformer.com/uploads/resources/LED_White_Light_Issues&Control_-_White_paper.pdf

LED illumination applications
http://en.wikipedia.org/wiki/Light-emitting_diode#Illumination_applications

"How Many Red, Green, and Blue LEDs to make White"
by Don Klipstein 2001
http://members.misty.com/don/ledrgb2w.html

LED Color Shifting
http://hackedgadgets.com/2006/02/14/wireless-led-color-shifting/

== "PC Card" PCMCIA ==

I maintain the
[http://david.carybros.com/html/pc_card_faq.html unofficial PC Card FAQ].

I'd like to move it to a wiki.
What would be the best wiki to put it on?
Open Circuits?

--
DavidCary

== Open Circuits Sysop ==

Whee! I'm a sysop at Open Circuits!
The power -- it's rushing to my head!
--[[User:DavidCary|DavidCary]] 15:20, 23 February 2007 (PST)

Hi David, will be nice to have antispam measures :).

--[[User:RafaelOrtiz|RafaelOrtiz]] 18:00, 28 October 2007 (PDT)

Hi David can you give me some block IP rights ?

--[[User:RafaelOrtiz|RafaelOrtiz]] 13:17, 18 November 2007 (PST)

Hi David, I noticed that a bunch of open circuits is just a placeholder. I'm effectively retired so I can probably help contribute to this Wiki by expanding a bunch of the sections, but the spam here is really way out of control. I look at the revision history and I see a good 10+ spam edits per day. Don't you think it's time to try requiring a logon to make edits? I thank that would really reduce the spam. Asking people to use a human controlled e-mail address is not that much. It's not like people need to give their real name and address or anything. I think you will find that more people will be willing to contribute if the spam problem is handled. Eliminating the spam is more of a problem at this point then getting people to contribute. It would also free up your time to focus more on real editing.
[[User:Mzoran|Mzoran]] 19:38, 12 December 2007 (PST)

Manufacturers

2008-01-03T22:20:44Z

200.51.208.38: getvir

rolleto
[[Analog Devices Inc.]] - Amplifiers, Converters, RF/IF Components, MEMS, DSP

[[CUI]] - Power supplies, power connectors, etc

[[Molex]] - The great connector company

[[Nordic Semiconductors]] - ISM Band(s) Transmitters and Transceivers

[[Samtec]] - USA based mfg of connectors and cables. They have the wacky stuff for reasonable prices.

[[Microchip]] - Microcontrollers - the great PIC family of microcontrollers
* [http://massmind.org/techref/piclis unofficial PICList discussion forums]
* [http://forum.microchip.com/ official Microchip discussion forums]

[[Atmel]] - Flash memory, ARM microcontrollers, - and the famous AVR microcontrollers
* [http://avrfreaks.net/wiki/index.php/ unofficial Atmel AVR discussion forums]

[[STMicroelectronics]] - http://www.st.com/

Cypress
* [http://psocdeveloper.com/ unofficial Cypress discussion forums]
* official Cypress discussion forums: start at http://cypress.com/ , then choose "Design", "Discussion".

Philips -- many things, including [[Integrated Circuits | ARM microcontroller]]s
* [http://www.embeddedrelated.com/groups/lpc2000/1.php lpc2000 Discussion Group]
* [http://forum.sparkfun.com/viewforum.php?f=11 Spark Fun Electronics Forum -> Everything ARM and LPC]

----

If you want information *about* a particular part, the best place is the datasheet -- usually on the manufacturer's web site.

If you want the actual part itself, though -- sometimes you can get samples directly from the manufacturer. But that's pretty hit-or-miss.
Your best bet is through some [[distributor]] or [[supplier]].

''(A "distributor" and a "supplier" are the same thing, right?)''

[[Category:Manufacturers]]

OpenCircuits:Copyrights

2008-01-03T21:52:57Z

200.51.208.38: domcaol

linoacelera
Too often copyrights are now used as an offensive weapon, rather than simply to afford protection.

The Open Circuits copyright is not like that.
Content is available under [http://creativecommons.org/licenses/by-sa/2.5/ Attribution-ShareAlike 2.5]. Share and enjoy.

OpenCircuits:Community portal

2008-01-03T21:49:07Z

200.51.208.38: tacdomric

relrelortroc
Welcome to Open Circuits.
This is a good place to talk about Open Circuits, as a whole.

We have {{NUMBEROFARTICLES}} articles now. Yay!

== Anti-Vandalism Bot ==
It is my opinion that this should be the top goal for this site to accomplish.

: ''We recently updated the $wgSpamRegex ( http://www.mediawiki.org/wiki/Manual:%24wgSpamRegex ). It should block nearly all of the kinds of spam we've been seeing in the past. (Use [[Meta:Sandbox]] for testing). --[[User:DavidCary|DavidCary]] 08:46, 6 June 2007 (PDT)''
::The problem is, that this is not a one time thing. It must be updated regulary, so it also works for new kinds of spam --SebDE

Seeing a lot of stubborn spammers. Can we implement some kind of ip blocking mechanism?, that blocks repeated spam ip's for a week or so. Here's a list of known [[spammer ip]].
:Blocking based on IPs might be usefull if it uses a maintained black or gray list, but the kind of IP blocking is used around here doesn't help much. --SebDE

Disabling edits from users that aren't logged in might help a lot: http://www.mediawiki.org/wiki/Manual:Faq#How_can_I_prevent_editing_by_anonymous_users.3F --[[User:Mzandrew|Mzandrew]] 14:16, 8 September 2007 (PDT)
:[[User:DavidCary|DavidCary]] wrote: "We want a system in a way that makes it very easy for anyone to help us." on his User Discussion page.
:But it wouldn't hurt if the creation of new sites would be logged in users only. (Would reduce the need to delete certain articles over and over again) --SebDE

Or if someone's not logged in, could we enable a captcha so that the spammers would at least have to do it manually?
Here's the ReCAPTCHA extension for mediawiki sites: http://www.mediawiki.org/wiki/Extension:ReCAPTCHA
There's also the ConfirmEdit extension. http://www.mediawiki.org/wiki/Extension:ConfirmEdit
--[[User:Mzandrew|Mzandrew]] 13:38, 9 September 2007 (PDT)
:That is way to overdesigned if you know what I mean. And just btw it is hell for accessibility. I would rather see the use other techniques like wgSpamRegex and the use of a maintained IP black list first before using such ugly things... --SebDE

::Obviously other methods are not working, I think captcha could be a hell for accessibility, but it is only when editing. I think is much worst for accesibility the incredible amount of spam that is attacking the wiki than captcha (think seriously about it)[[User:Garrocha|Garrocha]] 10:43, 27 December 2007 (PST)

I have a whole bunch of PIC projects and things I think I can do to contribute to this Wiki, but the spam here is way way out of control. I'm looking at the change logs and I'm seeing 20+ spam edits per day. I'm not so sure I want to contribute if my contributions are going to be destroyed in a matter or days. I think requiring a logon to make changes would cut out most of the spam. At this point, the problem is so bad that making things alittle harder for people to make changes is probably worth the benefits.

Also, this isn't directly related to spam, but it would be nice if the site didn't put nofollow on all the URLs. I think more people would be willing to add project info pages to the wiki if they new it would make them more visable in search engines. The wiki is small enough at this point that if people start abusing this it would be easy to ban or delete their account( assuming the change is made to require a login to make edits)
[[User:Mzoran|Mzoran]] 21:42, 14 October 2007 (PDT)

== electrical mailing lists ==
Yahoo claims they have
[http://dir.groups.yahoo.com/dir/Science/Engineering/Electrical 1,831 electrical engineering mailing lists].
What would be a good way of letting the people on those lists know about the Open Circuits wiki, without spamming them?
--[[User:DavidCary|DavidCary]] 13:30, 31 May 2006 (PDT)

* Publish cold fusion howto :-)
* Send one email/week and only once per list. And be on topic, listen carefully for responses.
[[User:Freqmax|Freqmax]] 16:24, 30 July 2007 (PDT)

== about Open Circuits ==
So, is there any connection between http://OpenCircuits.org/ , http://OpenCircuits.net/ , and this http://OpenCircuits.com/ wiki?
--[[User:DavidCary|DavidCary]] 23:47, 13 June 2006 (PDT)

No. There is no connection between any of http://opencircuits.com and the other websites listed.
[[User:Chazegh|Chazegh]] 02:55, 18 June 2006 (PDT)
== web rings ==
Document an original microcontroller project and join a PIC webring, or AVR webring. 20 June 2006

== audio electronics ==

Is there some other wiki for people to talk about audio electronics?
Or is this Open Circuits the best wiki for talking about things like
''"[http://analog.com/ Analog Devices] AN-221: The Alexander current-feedback audio power amplifier"'' by Mark Alexander
?

I think I would prefer to offload all the audio electronics controversies to some other wiki
(but which one?).
Still, it would be nice to have some "tips for high-power electronics" here.
I imagine that tips page would list the various quirks of high-power MOSFETs, BJTs, TRIACs, and IGBTs,
and (given a particular motor or speaker or other load)
how to select one over the others,
and various ways of working around those quirks.
--[[User:65.70.89.241|65.70.89.241]] 07:17, 10 August 2006 (PDT)

I just joined Open Circuits. I have been servicing and designing audio equipment for several years (Recording consoles a specialty) I hope you will have a section for audio electronics. I also work with video projection systems and theatrical lighting (stage struck at an early age) I play electric rock-blues guitar, so I also am interested in tube guitar amps (Marshall and Boogie). And there is a big difference in what a guitar player thinks an amp should do, and what a recording engineer wants an amp for. I think these are valid points for discussion.
I've also got an interest in power supplies (my experience is mostly with linear, but I've started learning about switching designs). In fact that brings me to my question, I have some regulator designs based on the 723 that I'd like to share. How do I go about doing that? I built a replacement for a console /- 18V @6A supply when I couldn't find the original regulator devices. I used 723s with external series pass devices. The unit has been working for close to 10 years now, so I think the design is worth sharing. Is anyone interested?

I also research discrete op amps like the Jensen 990. I've been working (on and off for years) on a clone of that using more modern, easily available parts and devices. Anyone else?
Finally, in response to the first entry in this section, I too read that application note in Analog Devices Audio/Video Reference Manual. My copy is dated 1992. I've repaired a lot of amplifiers, but haven't built any. If anyone else is hip to this amp I'd like to hear about it. It is a very unique design. I also like the A75 amp design from Nelson Pass and Norman Thagard, and the Leach Amp by Marshall Leach. The last two are pretty normal as far as design goes, not as adventurous as the Alexander with its current-feedback approach.
Aloha, RAF--[[User:66.8.194.185|66.8.194.185]] 14:04, 18 May 2007 (PDT)

== automotive electronics ==

Is there some other wiki for people to talk about automobile electronics?
Or is this Open Circuits the best wiki for talking about things like
[http://megamanual.com/ "experimental Do-It-Yourself programmable electronic fuel injection controller"]?
Or should we just point people who want to talk ECUs (engine control units) to the
[http://msefi.com/ MSEFI discussion forum],
even though it sadly lacks a wiki?
--[[User:DavidCary|DavidCary]] 22:36, 2 July 2007 (PDT)

== inviting bloggers to open circuits ==

=== how to connect a JTAG probe to a Nokia phone ===

I'd like to invite bloggers such as GyrosGeier to edit OpenCircuits.
Rather than just spamming him, I think he would be more inclined to help out
if we answered one of his questions first -- such as
[http://hogyros.de/?q=node/167 "If you have information on how to connect a JTAG probe to a Nokia phone, please let me know."]
Maybe I should start a page on [[JTAG]]...
--[[User:DavidCary|DavidCary]] 09:37, 22 September 2006 (PDT)

The [http://hackedgadgets.com/ Hacked Gadgets blog also has a bunch of cool electronics].
--[[User:DavidCary|DavidCary]] 11:58, 5 January 2007 (PST)

== red links ==

The default skin at OpenCircuits currently has "red links" = page exists, "dark red links" = page does not exist.

I find that confusing. (But not as bad as the wiki that has some links black-on-white, indistinguishable from normal text).

'''work-around''': Register (it's free, and you don't have to give any personal information), then choose the "preferences" link in the far upper-right corner and then pick any other skin.

The other skins have coloring that you may be more used to from other wiki: "blue links" = page exists, "red links" = page does not exist.

--[[User:DavidCary|DavidCary]] 08:58, 18 December 2006 (PST)

*** Guys, the red color on links is AwuFul, it brings ppl headaches.
That's the only reason I cant participate ***

--[[User:Takeda|Takeda]] 16:38, 29 September 2007 (PDT)

== inviting people from other forums to open circuits ==

Lots of people talk about circuits for LED lighting at
http://candlepowerforums.com/
.
Perhaps we can talk some of them into contributing here -- perhaps using a page or two of Open Circuits as a FAQ for LEDs and drive circuits.

== tool lists ==

Should we have an entire page on "tools", and mention it on the main page?
That risks listing *every* tool anyone has ever heard about,
like the page at
http://massmind.org/techref/tools.htm
.
Yes, I'm responsible for uglier bits on that page;
I think the wide variety of oscilloscopes are particularly confusing.
How could we cut through the confusion?

I see the "techniques" page already has a list of software tools.
Perhaps it would be nifty to have a short list of all the tools necessary for each technique?
Then a beginner would have a better idea of what tools he really needs to get (rather than looking at a huge list of every tool, and wondering for each one, ''"Am I going to regret buying it when I see it gathering dust? Or am I going to regret not buying it when I need it during a midnight debug session?"'').

--[[User:DavidCary|DavidCary]] 08:37, 24 January 2007 (PST)

== Requests For Help ==
Thanks for your help with the camcorder mic.

== sample component ==

What is the purpose of the [[Sample Component]] ?
--[[User:DavidCary|DavidCary]] 16:27, 7 May 2007 (PDT)

----

== current surge and battery life ==

Hi,

currently my board is using a 3V battery, in every 40msec it will turn on its RF to communicate with the base station. I face a problem here is that my battery life is badly affected. Turning on the RF with cause a current surge.

Will this surge affect my battery life? If I use a supercapacitor does it helps?

-- [[User:203.120.164.208]] 04:14, 30 April 2007

== MIDI electrical interface ==

In my opinion, the MIDI interface got a lot of things right that too many later interfaces still trip over.

* http://www.repairfaq.org/filipg/LINK/F_MIDI.html -- ASCII schematics
* http://www.engadget.com/2005/08/30/how-to-control-csound-with-a-custom-midi-controller-hardware/ -- hand-sketched schematics
* http://www.midi.org/about-midi/electrical.shtml "MIDI Electrical Specification Diagram & Proper Design of Joystick/MIDI Adapters" -- well-drawn schematics
* [http://en.wikipedia.org/wiki/The_MIDI_1.0_Protocol Wikipedia: The MIDI 1.0 Protocol]
* http://en.wikibooks.org/wiki/Behringer_FCB1010_MIDI_Pedal

It may look simple, but too often people try to "improve" it by adding or removing things without understanding, ending up with a worse system.

Is there any other wiki that is more appropriate for explaining the low-level details of the MIDI electrical interface, and *why* it was done that way?

I would be most interested in discussing new communication interfaces -- but is this really the right wiki?
Or would http://en.wikibooks.org/wiki/Serial_Programming or the [http://interwiki.sourceforge.net/cgi-bin/picawiki.pl/StartingPoint PICA wiki] be better for discussing improvements?
--[[User:DavidCary|DavidCary]] 13:21, 21 June 2007 (PDT)

== IC design ==

What do you think about
http://makeyourownchip.com/
?
Should we talk about VLSI design ([http://david.carybros.com/html/vlsi.html "VLSI: designing electronic chips"])
here at Open Circuits?
Or is there a more appropriate wiki somewhere else?
--[[User:DavidCary|DavidCary]] 15:59, 26 June 2007 (PDT)

== electronics infoline ==

So have you seen
"Free electronics projects"
http://electronicsinfoline.com/
"with Photo Preview"
?
--[[User:DavidCary|DavidCary]] 00:28, 1 July 2007 (PDT)

== generating a netlist with a "C++" program ==

The [http://positron.ps.uci.edu/~pier/csc/sup/Support.html "Support Electronics for ATLAS Muon CSC"] documentation claims that [http://positron.ps.uci.edu/~pier/csc/sup/CRB_LayoutNotes0.pdf "The design was captured with C++. There are no schematics."] and lists [http://positron.ps.uci.edu/~pier/csc/sup/crb_srce the C++ source code].

How did they do that?
--[[User:DavidCary|DavidCary]] 01:15, 3 July 2007 (PDT)

== rocket electronics ==

Is there another wiki that talks about rocket electronics?
Or is this Open Circuits the best place to talk about
ground support electronics
(such as [http://www.ukrocketman.com/rocketry/controller.shtml Launch Controller]s)
and
onboard electronics
(such as one
[http://www.ukrocketman.com/rocketry/compactrdasguide.shtml flight computer]
or another
[http://david.carybros.com/html/schematic.html#flight_computer flight computer]
)?
--[[User:DavidCary|DavidCary]] 14:21, 15 July 2007 (PDT)

== Minimig ==
I have created pages about the [[Minimig]] project which is running an Amiga 500 in a Xilinx FPGA. It's rather a work in progress, than a static documentation. I hope nobody minds. [[User:Freqmax|Freqmax]] 18:35, 27 July 2007 (PDT)

== Open Science ==

So does/should Open Science ( http://openscience.org/ ) have any relation to Open Circuits ?
--[[User:68.0.120.35|68.0.120.35]] 00:13, 5 August 2007 (PDT)

== LaTEX math markup ==

I wrote a quick howto on figuring out resistor values, but it looks bad without latex math markup enabled.
Here's what I wrote as it appears on open circuits: http://www.opencircuits.com/Talk:Relays
Here's how it appears on wikipedia (with math markup enabled): http://en.wikipedia.org/wiki/User:Mzandrew/Sandbox

Anyone know if this is a quick thing to enable for open circuits or if it's involved?

[[User:Mzandrew|Mzandrew]] 14:16, 8 September 2007 (PDT)

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'''SPAM DELETED!'''

I deleted a whole bunch of links that had been placed at the top of this page, probably by the same AH that did it to my page. I think the best solution would be to make it so no edits are possible without being logged in. Then there will be a record of who does this kind of thing. Then they can be banned from the site. I don't think that defeats the purpose of an open wiki environment, it simply means you have to register to contribute.

--[[User:RogerAF|RAF]] 10:30, 21 December 2007 (PST)

At least this page is still OK. The Spam AHole hit my user talk page again today. This is very aggravating.

--[[User:RogerAF|RAF]] 06:54, 22 December 2007 (PST)

: ''I agree. Annoying. I'm starting to "semi-protect" most pages so they can only be edited by logged-in users. I'm leaving a couple of pages wide open as a honeypot and/or test pages, so I can make tests and ban spammers without touching good pages. I think the $wgSpamRegex and/or ReCAPTCHA would be a better way to deal with spam. But my attempt to set them up isn't working yet. Sorry. --[[User:DavidCary|DavidCary]] 10:28, 3 January 2008 (PST)''

Help:Editing

2008-01-03T21:48:20Z

200.51.208.38: orlialrel

boelpaslil

Farnell

2008-01-03T21:47:58Z

200.51.208.38: rolbolirel

viacel
'''Farnell'''

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farnell is a large uk based general electronics company with a wide range of components, tools and general electrical devices. they normally deal in small orders but will accept bulk buys.

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[http://www.farnell.com farnell]