Editing Relays

[http://xionny.cn/topic/le-stagioni/ le stagioni dellaquila] [http://sneck.info/data/sony-diffusori/ sony diffusori 5 1] [http://wedner.info/content/view/biliardo-a.htm biliardo a 17] [http://wedner.info/content/view/hitachi-videocamere.htm hitachi videocamere digitali] [http://sneck.info/data/telefono-cordless/ telefono cordless siemens gigaset sl150] [http://funkall.us/images/small/main-hoon/ main hoon na] [http://joperan.org/data/retribuzione-sufficiente/ retribuzione sufficiente e condizioni locali] [http://funkall.us/images/small/dolls-kitano/ dolls kitano] [http://veggis.org.cn/resources/articles/banane-lamponi.htm banane lamponi] [http://klohy.info/img/styles/zebbra.htm zebbra] [http://sneck.info/data/celeron-mobile/ celeron mobile] [http://wedner.info/content/view/www-parmigianoreggiano.htm www parmigianoreggiano it] [http://manoke.cn/topic/gamepad-pc/ gamepad pc saitek] [http://manoke.cn/topic/istituti-di/ istituti di designer] [http://manoke.cn/topic/gazzettino-padova/ gazzettino padova] [http://manoke.cn/topic/fiat-stilo/ fiat stilo feel] [http://wedner.info/content/view/la-manica.htm la manica midi] [http://klohy.info/img/styles/meganoidi-ska.htm meganoidi ska] [http://xionny.cn/topic/gathering/ gathering] [http://soler.net.cn/data/logistica-aziendale.htm logistica aziendale] [http://xionny.cn/topic/www-versioni/ www versioni latine it] [http://klohy.info/img/styles/rocca-di.htm rocca di vadaro village] [http://wedner.info/content/view/milva-successi.htm milva successi i] [http://klohy.info/img/styles/nancy-dell.htm nancy dell olio] [http://klohy.info/img/styles/wings.htm wings] [http://svike.info/view/new/micu-pulici.htm micu pulici] [http://primonona.info/content/view/profumi-max/ profumi max mara] [http://primonona.info/content/view/buy-hawaiin/ buy hawaiin cruises] [http://xionny.cn/topic/julian-mcmahon/ julian mcmahon] [http://wedner.info/content/view/quiero-bailar.htm quiero bailar la salsa] [http://veggis.org.cn/resources/articles/holding-out.htm holding out for a hero bonnie tyler] [http://soler.net.cn/data/cartina-fisica.htm cartina fisica della inghilterra] [http://funkall.us/images/small/opel-corsa/ opel corsa 1994] [http://primonona.info/content/view/pentium/ pentium 4 3 40] [http://svike.info/view/new/forno-micro.htm forno micro onde] [http://joperan.org/data/f-leali/ f leali] [http://wedner.info/content/view/intercettazione.htm intercettazione] [http://funkall.us/images/small/la-strada/ la strada giusta] [http://veggis.org.cn/resources/articles/master-aid.htm master aid dis. sol. 250 ml] [http://veggis.org.cn/resources/articles/the-hitcher.htm the hitcher ii ti stavo aspettando] [http://joperan.org/data/rx-v/ rx v2500] [http://sneck.info/data/soderini/ soderini] [http://svike.info/view/new/antivirus.htm antivirus] [http://xionny.cn/topic/mflop/ mflop] [http://soler.net.cn/data/foto-cannabis.htm foto cannabis thc] [http://veggis.org.cn/resources/articles/sli-premium.htm sli premium] [http://klohy.info/img/styles/toner-canon.htm toner canon lbp 800] [http://xionny.cn/topic/caricaturas-de/ caricaturas de aventuras] [http://veggis.org.cn/resources/articles/bosch-lavastoviglie.htm bosch lavastoviglie inox] [http://svike.info/view/new/roma-gay.htm roma gay] [http://veggis.org.cn/resources/articles/gay-sesso.htm gay sesso video] [http://wedner.info/content/view/spaghetti-funk.htm spaghetti funk articolo 31] [http://sneck.info/data/giava-centrale/ giava centrale] [http://budget7i.info/lib/ddr-pc/ ddr pc2700 a 333 mhz] [http://wedner.info/content/view/schede-video.htm schede video x800xl] [http://joperan.org/data/liber-feat/ liber feat marian] [http://polex.com.cn/resources/articles/meet.htm meet] [http://wedner.info/content/view/gare-appalto.htm gare appalto estero] [http://funkall.us/images/small/ritch-bitch/ ritch bitch] [http://klohy.info/img/styles/lettore-dvddivx.htm lettore dvd-divx portatile] [http://xionny.cn/topic/jeux-floraux/ jeux floraux] [http://budget7i.info/lib/rod-michael/ rod michael] [http://xionny.cn/topic/x-ray/ x ray raggi x] [http://manoke.cn/topic/televisori/ televisori 17] [http://sneck.info/data/tears-for/ tears for fears. the universal masters dvd collection] [http://manoke.cn/topic/matix/ matix] [http://xionny.cn/topic/bevanda-ai/ bevanda ai cereali] [http://manoke.cn/topic/offerta-cellulari/ offerta cellulari nokia] [http://wedner.info/content/view/binocolo-notturno.htm binocolo notturno] [http://primonona.info/content/view/le-nuove/ le nuove foto di costantino e daniele] [http://klohy.info/img/styles/bouble-boll.htm bouble boll] [http://veggis.org.cn/resources/articles/magic-balls.htm magic balls] [http://svike.info/view/new/player-gp.htm player 3gp] [http://sneck.info/data/www-ticket/ www ticket it] [http://manoke.cn/topic/firenze-zurigo/ firenze zurigo biglietti aerei] [http://manoke.cn/topic/bovalino/ bovalino] [http://soler.net.cn/data/dvd-plextor.htm dvd plextor 716sa] [http://xionny.cn/topic/psrip-net/ ps2rip net] [http://soler.net.cn/data/oistrach-david.htm oistrach, david] [http://polex.com.cn/resources/articles/kukiz-i.htm kukiz i borysewicz] [http://polex.com.cn/resources/articles/lt-j.htm lt j] [http://sneck.info/data/do-you/ do you knoe where] [http://svike.info/view/new/e-p.htm e p t napoli] [http://polex.com.cn/resources/articles/panasonic-dp.htm panasonic dp 1520p] [http://budget7i.info/lib/profumo-dune/ profumo dune donna] [http://soler.net.cn/data/remembr.htm remembr] [http://sneck.info/data/el/ el 42] [http://klohy.info/img/styles/birdhunter.htm birdhunter] [http://svike.info/view/new/gli-unni.htm gli unni] [http://soler.net.cn/data/alessandria-chieti.htm alessandria chieti] [http://veggis.org.cn/resources/articles/radio-control.htm radio control] [http://joperan.org/data/sharp/ sharp 15] [http://wedner.info/content/view/domenico-modugno.htm domenico modugno nel blu dipinto di blu] [http://xionny.cn/topic/tratado-de/ tratado de peru con chile] [http://polex.com.cn/resources/articles/cellulari-gps.htm cellulari gps] [http://sneck.info/data/volvo-s/ volvo s60 d5 kinetic] [http://primonona.info/content/view/il-bagatto/ il bagatto] [http://funkall.us/images/small/knock-on/ knock on wood] [http://veggis.org.cn/resources/articles/ricetta-torta.htm ricetta torta di nutella] [http://budget7i.info/lib/ragnarok/ ragnarok] [http://veggis.org.cn/resources/articles/tv-schermo.htm tv schermo lcd 10] [http://soler.net.cn/data/i-casi.htm i casi del] [http://klohy.info/img/styles/piattoni-franca.htm piattoni franca] [http://soler.net.cn/data/alberghi-di.htm alberghi di una stella milano] [http://primonona.info/content/view/jvc-kdg/ jvc kd-g411] [http://joperan.org/data/la-classica/ la classica] [http://budget7i.info/lib/lavasciuga-biancheria/ lavasciuga biancheria] [http://veggis.org.cn/resources/articles/vivaldi-la.htm vivaldi la notte] [http://svike.info/view/new/sex-shop.htm sex shop ragusa] [http://manoke.cn/topic/zalman-cu/ zalman 700cu] [http://joperan.org/data/giovanni-papini/ giovanni papini] [http://sneck.info/data/tivutibi-com/ tivutibi com] [http://manoke.cn/topic/nec-e/ nec e313 sbloccare] [http://primonona.info/content/view/obrecht-jacob/ obrecht, jacob] [http://klohy.info/img/styles/tiscali-giochi.htm tiscali giochi trucchi] [http://funkall.us/images/small/ipod-custodie/ ipod custodie] [http://svike.info/view/new/profumi-cartier.htm profumi cartier] [http://polex.com.cn/resources/articles/herson.htm herson] [http://sneck.info/data/go-west/ go west] [http://klohy.info/img/styles/puma-ilo.htm puma ilo] [http://wedner.info/content/view/sogni-di.htm sogni di gloria] [http://manoke.cn/topic/numeri-privati/ numeri privati] [http://manoke.cn/topic/ggggggggggggggggggggggggggggggggg/ ggggggggggggggggggggggggggggggggg] [http://primonona.info/content/view/hp-diapositive/ hp diapositive scanner] [http://primonona.info/content/view/la-trasformazione/ la trasformazione eterogenea] [http://veggis.org.cn/resources/articles/wireless-g.htm wireless 11g access point] [http://xionny.cn/topic/voli-per/ voli per edimburgo] [http://svike.info/view/new/staffa-a.htm staffa a muro sony] [http://soler.net.cn/data/tejido-vegetal.htm tejido vegetal] [http://xionny.cn/topic/genesis-songbook/ genesis songbook] [http://sneck.info/data/minijuegoscom/ minijuegos.com] [http://sneck.info/data/www-sleazydream/ www sleazydream com] [http://veggis.org.cn/resources/articles/geforce.htm geforce 5500 256] [http://manoke.cn/topic/nvidia-/ nvidia 6200 256mb agp] [http://sneck.info/data/pagina-erotica/ pagina erotica] [http://svike.info/view/new/router-cisco.htm router cisco per connessione adsl] [http://wedner.info/content/view/gioco-taipei.htm gioco taipei] [http://sneck.info/data/gammarus/ gammarus] [http://xionny.cn/topic/agenzia-delle/ agenzia delle dogana] [http://polex.com.cn/resources/articles/master-prisma.htm master prisma] [http://primonona.info/content/view/river-below/ river below] [http://veggis.org.cn/resources/articles/sophie-kinsella.htm sophie kinsella] [http://xionny.cn/topic/giochi-di/ giochi di        polizia] [http://veggis.org.cn/resources/articles/marlowe-indaga.htm marlowe indaga] [http://joperan.org/data/dissipatore-socket/ dissipatore socket 462] [http://veggis.org.cn/resources/articles/disegni-da.htm disegni da colorare babbo natale] [http://veggis.org.cn/resources/articles/monastero-s.htm monastero s rita] [http://svike.info/view/new/nuovi-angeli.htm nuovi angeli] [http://budget7i.info/lib/moglie-nuda/ moglie nuda e siciliana] [http://wedner.info/content/view/cabrio-mini.htm cabrio mini cooper s] [http://funkall.us/images/small/www-telemarket/ www telemarket it] [http://budget7i.info/lib/biotherm-line/ biotherm line peel] [http://soler.net.cn/data/duello-con.htm duello con la morte] [http://funkall.us/images/small/paglialunga/ paglialunga] [http://polex.com.cn/resources/articles/fiamme-a.htm fiamme a calcutta] [http://sneck.info/data/an/ an-] [http://wedner.info/content/view/traghetto-elba.htm traghetto elba] [http://polex.com.cn/resources/articles/mutuo-agevolato.htm mutuo agevolato giovane coppia] [http://xionny.cn/topic/asus-pnd/ asus p5nd2 deluxe] [http://sneck.info/data/chat-al/ chat al buio ha palermo] [http://sneck.info/data/bagnati/ bagnati] [http://soler.net.cn/data/rendita-catastale.htm rendita catastale] [http://soler.net.cn/data/optio-pentax.htm optio pentax] [http://manoke.cn/topic/friends-/ friends - stagione 1] [http://budget7i.info/lib/nikon-dx/ nikon dx] [http://joperan.org/data/trinity-college/ trinity college] [http://manoke.cn/topic/scara/ scara] [http://soler.net.cn/data/emirates.htm emirates] [http://polex.com.cn/resources/articles/compressori-frigorifero.htm compressori frigorifero] [http://budget7i.info/lib/torna-con/ torna con me] [http://joperan.org/data/epson-aculaser/ epson aculaser al-cx11n] [http://polex.com.cn/resources/articles/cipolline-in.htm cipolline in agro dolce] [http://veggis.org.cn/resources/articles/condizionatore-portatile.htm condizionatore portatile pompa di calore] [http://svike.info/view/new/verbatim-dvd.htm verbatim dvd] [http://budget7i.info/lib/www-emendamento/ www emendamento legge 194 it] [http://primonona.info/content/view/remember-me/ remember me james horner] [http://budget7i.info/lib/voglie-pazze/ voglie pazze, desideri... notti di piacere] [http://funkall.us/images/small/calciatori-nudi/ calciatori nudi] [http://soler.net.cn/data/acer-lettore.htm acer lettore mp3 512] [http://wedner.info/content/view/futurama-magazines.htm futurama magazines] [http://joperan.org/data/sposati/ sposati] [http://budget7i.info/lib/www-caesartour/ www caesartour it] [http://joperan.org/data/brenda-exporto/ brenda exporto] [http://sneck.info/data/forone/ forone] [http://sneck.info/data/red-zone/ red zone] [http://polex.com.cn/resources/articles/manic-street.htm manic street teachers] [http://soler.net.cn/data/sedile-doccia.htm sedile doccia] [http://veggis.org.cn/resources/articles/sdio-card.htm sdio card] [http://polex.com.cn/resources/articles/free-free.htm free free] [http://klohy.info/img/styles/foto-pene.htm foto pene] [http://funkall.us/images/small/ahmet-hikmet/ ahmet hikmet] [http://veggis.org.cn/resources/articles/isola-di.htm isola di white] [http://klohy.info/img/styles/s.htm s3] [http://klohy.info/img/styles/lofra-mx.htm lofra mx 66] [http://sneck.info/data/foto-ss/ foto ss lazio] [http://veggis.org.cn/resources/articles/hbh-sony.htm hbh-35 sony ericsson] [http://sneck.info/data/fiat-coupe/ fiat coupe 1 8 turbo] [http://klohy.info/img/styles/kit-scaffale.htm kit scaffale] [http://manoke.cn/topic/mp-player/ mp3 player sitecom] [http://wedner.info/content/view/il-marito.htm il marito ricco] {| align=right
|-
| 
[[Image:Main-G5Q-14.jpg|Relay]]
|}
{{mergeto|switches}}

=== Description ===
A PIC can't source more than 25mA, so how do I turn on/off a light bulb? With a relay!

A PIC can't source more than 25mA, so how do I turn on/off a relay? With a transistor!

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 ===

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.

When switching large loads, you can get something call ''fly-back current''. The fly-back current can cause surges of voltage when a device is kicked on/off (imagine when the lights dim when you turn on the microwave).
These surges can arc and destroy nearby components.

[[Image:Relay-Example.jpg|Example Relay Circuit]]

The diode 1N4148 (simple, cheap, can handle ~200mA current) is there to direct the fly-back current to a safe path. Without that diode, the flyback current could arc and destroy some nearby component.
Be sure to watch how you polarize your diode.

=== Documents ===

=== Footprints ===

[[SFE_Footprint_Library|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 ===

''(Is there anything special about these particular relays?)''

Digikey part # : G5Q-1-DC12<br>
Single Piece Price : $2.25<br>
12 VDC SPDT 

All Electronics part # : [http://www.allelectronics.com/make-a-store/item/RLY-275/24-VDC-SPDT-PC-MOUNT-POWER-RELAY/-/1.html RLY-275]<br>
Single Piece Price: $0.50<br>
24 VDC SPDT


=== Related Items ===

=== Further Reading ===

* [[Switch Terminology]]
* [[Basic_Circuits_and_Circuit_Building_Blocks#Relay_with_Diode_Snubber | Relay with Diode Snubber]]
* [[Basic_Circuits_and_Circuit_Building_Blocks#Transistor_Low_Side_Switch]]
* [[relay CPU]]
* [http://en.wikipedia.org/wiki/flyback_diode Wikipedia: flyback diode]
* [http://www.dnatechindia.com/index.php/Tutorials/8051-Tutorial/Relay-Interfacing.html Interfacing Relay To Micro controller]

[[Category:Components]]