OpenCircuits - User contributions [en]

OpenCircuits:Community portal

2007-09-06T15:02:33Z

218.9.138.116:

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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 $wgSpamRegex ( http://www.mediawiki.org/wiki/Manual:$wgSpamRegex ). 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)''

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]].

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

== 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)

== 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

POV display

2007-09-06T14:40:12Z

218.9.138.116:

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A "persistence of vision display" (POV display) has only a single line of LEDs blinking on and off.
The display mechanically sweeps it across a person's field of view,
giving the illusion of a 2D display.

''(Do I need a diagram or a picture here?)''

(Nearly all LED displays in microwave ovens and alarm clocks electrically sweep the digits across a person's field of view, giving the illusion that it's displaying all 4 digits of the time "12:55" when actually only one digit is illuminated at any one instant).

[[User:DavidCary]] is building yet another "POV display".

I plan on putting a few features into my display that I haven't seen in any other so far:

* bright blue LEDs (even though blue is usually the most expensive color ... although sometimes "true green" is even more expensive than blue).
* no slip rings -- just pumping energy across an air gap
* ... and a few other features that I'm keeping hush-hush.

I want lots of lumens.
Unfortunately, when I go to pick LEDs out of the catalogs, they're not
rated in lumens, they're rated in candelas.

Is it even possible to estimate "lumens" from the catalog information?

Do you know what the difference is? Does your flashlight really
produce 10 times the light ( in lumens)? Or does the flashlight merely
focus its light on a tiny spot, so that that spot gets 10 times as
many candelas ?

For example, check out these 2 LEDs:
$8.75 SSP-LX6144C7UC : 4000 mcd at 120 mA
$8.75 SSP-LX6144D7UC : 1800 mcd at 120 mA

From the mcd rating, it appears that the first one is more than 2wice
as bright -- and it is, if you're directly in front of it when you
look at it.
However, if you're even the tiniest bit off-center, the second one is
much brighter -- in fact, the total lumens that second LED puts out
(2500 mlm) is slightly more than the total lumens than the first one.
If you diffuse the light and try to light up a whole room with an
array of them, the second one will make the room brighter.

I'm currently planning on using these in my first POV display:
* $1.32 Telux TLWB7900 : blue : 330 mlm, 231 mcd at 50 mA. (price in ones from http://Newark.com/ )

Other LEDs I considered using in my POV display (and may re-consider for my next one):

* $18.89 "Lamina light engine" BL-22B1-0140 : 22000 mlm at 420 mA. (this price includes the required heat sink -- price in ones from http://Digikey.com/ ). This has the most lumens per dollar I've found so far (for blue LEDs).
* $8.750 Sunbrite LuxLEDs SSP-LX6144D7UC blue: 120 mA, 2500 mlm, 1800 mcd (Odd that the red Sunbrite LuxLEDs are cheaper at Newark, the other colors cheaper at Digikey.) cheapest $/lumen blue LED, except for the "light engine"
* $2.550 Lumex "DSP LED" 67-1876-ND: blue, 5 mm, 2500 mcd ( DigiKey ) apparently have some kind of internal chip. All colors run at 2.0 V nominal (1.5 V minimum) (rather than running on current like most LEDs. unfortunately, the data sheet doesn't suggest how much current they take -- I presume more than 20 mA).
* $1.600 Sunbrite "based LED" SSP-01TWB7UWB12 (441-1007-ND) blue 10 mm 20 mA 7000 mcd
* $5.980 GM5WA06270A SMT RGB (35 mA red, 35 mA green, 35 mA blue) 3000 mcd (full color range -- apparently used for digital camera flash ?) (Digikey)
* Mouser: hi-power LEDs ( http://www.mouser.com/search/refine.aspx?Ntt=LEDs hi-power ) shows "lumens" directly -- exactly what I wanted.

== further reading ==
Spoke-POV and propeller clocks links:

* An entire discussion forum devoted to POV displays http://www.ladyada.net.nyud.net:8090/forums/viewforum.php?f=11
** In particular, lots of nice pictures http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?p=4712
** 'no-microcontroller-programmer-needed' minipov http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?t=32
* LEDtoy on Sourceforge http://ledtoy.sourceforge.net/
* Ian’s Spoke POV http://www.ianpaterson.org/projects/spokepov20050704/index.htm
* "Propeller Clock" Mechanically Scanned LED Clock: by Bob Blick http://www.bobblick.com/techref/projects/propclock/propclock.html (I think this is the original POV display)
* micro POV display http://positron.org/projects/mpov/ small enough for "glueing it to my shaved head."

----

Is this http://led-display-and-design-swicki.eurekster.com/ relevant?

I think so--[[User:71.234.233.163|71.234.233.163]] 18:06, 22 June 2007 (PDT)

Chemical Etchants

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After masking off the parts of the copper-clad board you want to keep, you need to remove the parts you don't want to keep. This is usually done by chemically etching away the copper. There are a lot of different chemical techniques for doing this, each with its own advantages and drawbacks.

None of these chemicals is incredibly dangerous, but they can all be toxic or caustic, and should be treated with care. Eye protection and gloves are a very good idea. Before you start, make sure you know how dangerous each chemical is, and figure out what you will need to do if you spill it or get it on yourself. Washing with plenty of water is usually a good start. For some chemicals you may want to keep a neutralizing agent handy. An MSDS (Materials Safety Data Sheet) for the chemical will give you some basic information.

== Ferric Chloride ==
This is the most common hobbyist etchant. Ferric chloride, FeCl3, is a brownish substance. It's usually sold in a bottle (dissolved in water, perhaps with a little acid or peroxide) or as a powder (which you have to dissolve in water).

When in solution, ferric chloride is a ferric ion (Fe3 ) and a chloride ion (Cl-). The ferric ion reacts with the metallic copper on the circuit board in a redox reaction, producing a ferrous ion (Fe2 ) and cuprous or cupric (Cu1 or Cu2 ) copper. The chlorine is just along for the ride. The copper ion, unlike the metallic copper, is soluble, so it leaves the circuit board and goes into solution. The reaction products form a black sludge which settles to the bottom of the etching tank. After etching enough copper, all your Fe3 is used up and your solution is full of Cu1 , and you need to get more etchant.

== Ammonium Persulfate ==
Expensive