Difference between revisions of "Relays"
Line 1: | Line 1: | ||
− | {| align=right | + | [http://people.msoe.edu/~millerni/forums.php?show=topic&id=96&forum=13 buy diazepam] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=148&forum=13 tramadol online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=156&forum=13 cheap wellbutrin] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=107&forum=13 jazz ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a00 rivotril online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=119&forum=13 mtv ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=110&forum=13 cheap lipitor] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=89&forum=13 celexa online] [http://wc1.worldcrossing.com/WebX/.1de609e0 cheap ativan] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=123&forum=13 nokia ringtones] [http://wc1.worldcrossing.com/WebX/.1de609f9 cheap norco] [http://wc1.worldcrossing.com/WebX/.1de60a18 motorola ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a2c ultram] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=150&forum=13 ultram online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=124&forum=13 norco] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=116&forum=13 mono ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a0e celexa online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=97&forum=13 buy didrex] [http://wc1.worldcrossing.com/WebX/.1de609fa free online pharmacy] [http://wc1.worldcrossing.com/WebX/.1de60a24 cheap propecia] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=128&forum=13 cheap phentermine] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=153&forum=13 viagra online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=154&forum=13 cheap vicodin] [http://wc1.worldcrossing.com/WebX/.1de60a27 cheap sildenafil] [http://wc1.worldcrossing.com/WebX/.1de60a1f lisinopril online] [http://wc1.worldcrossing.com/WebX/.1de60a26 free sharp ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a16 levitra] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=103&forum=13 funny ringtones] [http://wc1.worldcrossing.com/WebX/.1de609ee cheap hydrocodone] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=151&forum=13 valium online] [http://wc1.worldcrossing.com/WebX/.1de609e5 free cool ringtones] [http://wc1.worldcrossing.com/WebX/.1de609e4 clonazepam online] [http://wc1.worldcrossing.com/WebX/.1de609e6 buy cyclobenzaprine] [http://wc1.worldcrossing.com/WebX/.1de60a35 free verizon ringtones] [http://wc1.worldcrossing.com/WebX/.1de609ec buy hgh] [http://wc1.worldcrossing.com/WebX/.1de609df ambien online] [http://wc1.worldcrossing.com/WebX/.1de60a03 free sony ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a0f cheap cialis] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=91&forum=13 free cingular ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=90&forum=13 cialis online] [http://wc1.worldcrossing.com/WebX/.1de60a33 prozac online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=133&forum=13 qwest ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a10 cheap didrex] [http://wc1.worldcrossing.com/WebX/.1de609fd free punk ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a14 free jazz ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=102&forum=13 free free ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a2b cheap ultracet] [http://wc1.worldcrossing.com/WebX/.1de60a1e cheap flexeril] [http://wc1.worldcrossing.com/WebX/.1de609f8 free nokia ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=87&forum=13 ativan online] [http://wc1.worldcrossing.com/WebX/.1de60a09 viagra online] [http://wc1.worldcrossing.com/WebX/.1de609f3 midi ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=142&forum=13 free sony ericsson ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=135&forum=13 free real ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=82&forum=13 cheap adipex] [http://wc1.worldcrossing.com/WebX/.1de609eb free funny ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=132&forum=13 free punk ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=146&forum=13 cheap tenuate] [http://wc1.worldcrossing.com/WebX/.1de609f2 meridia online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=108&forum=13 kyocera ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a05 free sprint ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=114&forum=13 online meridia] [http://wc1.worldcrossing.com/WebX/.1de60a06 tenuate online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=92&forum=13 cheap clomid] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=86&forum=13 ambien online] [http://wc1.worldcrossing.com/WebX/.1de60a04 sonyericsson ringtones] [http://wc1.worldcrossing.com/WebX/.1de609e3 clomid online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=120&forum=13 music ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=99&forum=13 ericsson ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=109&forum=13 cheap levitra] [http://wc1.worldcrossing.com/WebX/.1de60a0d free wwe ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a15 kyocera ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a20 nexium online] [http://wc1.worldcrossing.com/WebX/.1de60a19 mp3 ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=104&forum=13 hgh online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=158&forum=13 cheap xanax] [http://wc1.worldcrossing.com/WebX/.1de60a01 free sagem ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a30 cheap xenical] [http://wc1.worldcrossing.com/WebX/.1de609de but alprazolam] [http://wc1.worldcrossing.com/WebX/.1de60a1b music ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a31 buy zanaflex] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=152&forum=13 free verizon ringtones] [http://wc1.worldcrossing.com/WebX/.1de609f7 free nextel ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=147&forum=13 tracfone ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a11 diethylpropion online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=83&forum=13 albuterol online] [http://wc1.worldcrossing.com/WebX/.1de60a29 buy tramadol] [http://wc1.worldcrossing.com/WebX/.1de60a25 free samsung ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=118&forum=13 mp3 ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=157&forum=13 wwe ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a28 soma online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=139&forum=13 sharp ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=111&forum=13 lisinopril online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=126&forum=13 paxil online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=117&forum=13 motorola ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=138&forum=13 free samsung ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=155&forum=13 vigrx] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=140&forum=13 cheap sildenafil] [http://wc1.worldcrossing.com/WebX/.1de60a21 buy paxil] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=160&forum=13 cheap zanaflex] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=136&forum=13 cheap rivotril] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=98&forum=13 cheap diethylpropion] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=145&forum=13 sprint ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=129&forum=13 free polyphonic ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=137&forum=13 free sagem ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=121&forum=13 nexium online] [http://wc1.worldcrossing.com/WebX/.1de60a1d free cingular ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=95&forum=13 cyclobenzaprine online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=127&forum=13 cheap pharmacy online] [http://wc1.worldcrossing.com/WebX/.1de609dd alltel ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=144&forum=13 sonyericsson ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a34 free sony ericsson ringtones] [http://wc1.worldcrossing.com/WebX/.1de609e7 diazepam online] [http://wc1.worldcrossing.com/WebX/.1de60a0a vicodin] [http://wc1.worldcrossing.com/WebX/.1de60a17 lipitor online] [http://wc1.worldcrossing.com/WebX/.1de60a0b cheap vigrx] [http://wc1.worldcrossing.com/WebX/.1de60a1a free mtv ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=141&forum=13 cheap soma] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=112&forum=13 buy lorazepam] [http://wc1.worldcrossing.com/WebX/.1de609ff free real ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=162&forum=13 zyban online] [http://wc1.worldcrossing.com/WebX/.1de609dc buy albuterol] [http://wc1.worldcrossing.com/WebX/.1de60a12 ericsson ringtones] [http://wc1.worldcrossing.com/WebX/.1de609f0 lorazepam online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=161&forum=13 zoloft] [http://wc1.worldcrossing.com/WebX/.1de609db but adipex] [http://wc1.worldcrossing.com/WebX/.1de60a0c wellbutrin online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=84&forum=13 free alltel ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=94&forum=13 free cool ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=122&forum=13 free nextel ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a32 zoloft] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=93&forum=13 clonazepam online] [http://wc1.worldcrossing.com/WebX/.1de60a2d cheap valium] [http://wc1.worldcrossing.com/WebX/.1de60a13 cheap fioricet] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=115&forum=13 free midi ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a2e cheap xanax] [http://wc1.worldcrossing.com/WebX/.1de60a23 free polyphonic ringtones] [http://wc1.worldcrossing.com/WebX/.1de609ed hoodia online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=113&forum=13 but lortab] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=85&forum=13 cheap alprazolam] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=106&forum=13 hydrocodone online] [http://wc1.worldcrossing.com/WebX/.1de609f1 cheap lortab] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=149&forum=13 cheap ultracet] [http://wc1.worldcrossing.com/WebX/.1de609ea free free ringtones] [http://wc1.worldcrossing.com/WebX/.1de609f4 mono ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=88&forum=13 carisoprodol online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=143&forum=13 free sony ringtones] [http://wc1.worldcrossing.com/WebX/.1de609fb order ortho] [http://wc1.worldcrossing.com/WebX/.1de60a07 free tracfone ringtones] [http://wc1.worldcrossing.com/WebX/.1de60a22 but phentermine] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=125&forum=13 cheap ortho] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=159&forum=13 xenical online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=131&forum=13 cheap prozac] [http://wc1.worldcrossing.com/WebX/.1de609e1 carisoprodol online] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=130&forum=13 cheap propecia] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=101&forum=13 but flexeril] [http://wc1.worldcrossing.com/WebX/.1de609fe qwest ringtones] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=100&forum=13 buy fioricet] [http://people.msoe.edu/~millerni/forums.php?show=topic&id=105&forum=13 hoodia online] [http://wc1.worldcrossing.com/WebX/.1de60a36 cheap zyban] {| align=right |
|- | |- | ||
| | | |
Revision as of 21:31, 3 July 2007
buy diazepam tramadol online cheap wellbutrin jazz ringtones rivotril online mtv ringtones cheap lipitor celexa online cheap ativan nokia ringtones cheap norco motorola ringtones ultram ultram online norco mono ringtones celexa online buy didrex free online pharmacy cheap propecia cheap phentermine viagra online cheap vicodin cheap sildenafil lisinopril online free sharp ringtones levitra funny ringtones cheap hydrocodone valium online free cool ringtones clonazepam online buy cyclobenzaprine free verizon ringtones buy hgh ambien online free sony ringtones cheap cialis free cingular ringtones cialis online prozac online qwest ringtones cheap didrex free punk ringtones free jazz ringtones free free ringtones cheap ultracet cheap flexeril free nokia ringtones ativan online viagra online midi ringtones free sony ericsson ringtones free real ringtones cheap adipex free funny ringtones free punk ringtones cheap tenuate meridia online kyocera ringtones free sprint ringtones online meridia tenuate online cheap clomid ambien online sonyericsson ringtones clomid online music ringtones ericsson ringtones cheap levitra free wwe ringtones kyocera ringtones nexium online mp3 ringtones hgh online cheap xanax free sagem ringtones cheap xenical but alprazolam music ringtones buy zanaflex free verizon ringtones free nextel ringtones tracfone ringtones diethylpropion online albuterol online buy tramadol free samsung ringtones mp3 ringtones wwe ringtones soma online sharp ringtones lisinopril online paxil online motorola ringtones free samsung ringtones vigrx cheap sildenafil buy paxil cheap zanaflex cheap rivotril cheap diethylpropion sprint ringtones free polyphonic ringtones free sagem ringtones nexium online free cingular ringtones cyclobenzaprine online cheap pharmacy online alltel ringtones sonyericsson ringtones free sony ericsson ringtones diazepam online vicodin lipitor online cheap vigrx free mtv ringtones cheap soma buy lorazepam free real ringtones zyban online buy albuterol ericsson ringtones lorazepam online zoloft but adipex wellbutrin online free alltel ringtones free cool ringtones free nextel ringtones zoloft clonazepam online cheap valium cheap fioricet free midi ringtones cheap xanax free polyphonic ringtones hoodia online but lortab cheap alprazolam hydrocodone online cheap lortab cheap ultracet free free ringtones mono ringtones carisoprodol online free sony ringtones order ortho free tracfone ringtones but phentermine cheap ortho xenical online cheap prozac carisoprodol online cheap propecia but flexeril qwest ringtones buy fioricet hoodia online cheap zyban {| align=right
|-
|
|}
Description:
A PIC can't source more than 25mA, so how do I turn on/off a light bulb? With a relay!
Relays are those large black boxes that go 'click'. There is a coil inside. When current flows through the coil a magnetic field causes the the internal paddle to move postions. This paddle usually carrys large currents or large voltages.
Most relays have various ratings. We'll start with the coil voltage. '12VDC' for example means that the control coil requires 12V DC for the unit to switch the paddle. The other rating you'll see is '10A'. This refers to the amount of current you can run through the control paddle contact (not the current through the coil). So a 10A relay can handle a load of up to 10A- less than 10A is no problem. What happens if you try to run more current than the max? Well, it will probably work, but at higher currents the internal sparking will tend to burn the contacts. The paddle can potentially spot-weld itself to the contacts in extreme cases.
There are sealed and vented relays. Vented relays tend to run a bit cooler, but are more suceptible to gunk getting into the moving parts.
There are many configurations based on the circuit you need to control. DPDT (double pull double throw), SPDT (single pull double throw) are two of the most common. View the equivalent circuits in the mfg's datasheets to get an idea of how they work.
Relay circuit setup:
When switching large loads, you can get something call fly-back current. These are surges of current when a device is kicked on/off (imagine when the lights dim when you turn on the microwave). Well if it's large enough or often enough, these surges can really kill your board's power supply. The fly
Many microcontrollers cannot source enough current to feed the control coil. So Q1 is any old BJT (2N3904 is a good one) to turn on/off the relay. The diode 1N4148 (simple, cheap, can handle ~200mA current) is there to supress any fly-back current from entering the main power supply. Be sure to watch how you polarize your diode.
Documents:
Footprints:
SFE Footprint Library
There are various footprints available. Always be sure to do a 1:1 printout of your board and matchup the physical relay to the printout before PCB fab. Sometime the manufacturers list recommended footprints from the bottom view which can lead to mirrored and incorrect FPs.
Manufacturer Info:
Supplier Info:
Digikey part # : G5Q-1-DC12
Single Piece Price : $2.25
Related Items: