Difference between revisions of "Relays"

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Revision as of 17:02, 16 August 2007

philips impianti hi-fi velsen zephir condizionatore casamicciola fan fiction site sermon barbara durso locali hard trittico damore kodak - easyshare cx7330 ups 650 macchine caffe krups losing my tiziana sensi fuji - finepix s5500 jennifer connelly nuda fort washington - vita da cani scarpe lizard time to rock la mano che uccide porsche 2003 996 franchising abbronzatura vaio 17 notebook auto noleggio benevento frigoriferi incasso 320 ituiutaba set posate con origen nel deserto della california gay e transex stefania lay curriculum vitae europeo un medico in famiglia. prima serie. vol. 01 www roten com monitor yakumo 17 lcd seit elettronica srl hard disck 80gb fiat punto 1.2 16v sporting canon cb-2lue godwin austen motoraduni 2004 vicenza emma shapplin - carmine meo danu righeira karaoke calcio.com konica minolta dimage 600 rebel a k a forno con piano cottura clipart cobra videochatgratis accessori per interni audi 4 miratoio mac os 10 4 tiger sacrifice by lisa gerard and peter burke von savigny udo samel jamie walters songs top sensation dulce maria clase 406 posto al sole rai it bella balilla platinum wall dating sites tu che foto arcuri totali spies frigorifero no frost classe a silver miguel bose super superman omicidio per vocazione minueto la celiachia notebook schede acquisizione e tv lamiere reggio emilia rx v2500 ragazza ischia poltrona piscina turn me on de kevin little palmari ppc xvid video codec windows dance live in trento awz 6516 motori di ricrca monica belucci sex charme martin il marziano trust wireless audio video ram notebook ddr sdram hp marlen hit mania dance 2000 2001 ka sport driana acer x700 notebook natural power www asharqalawsat com gancio orecchino eamon test lipsia citta amico maria de filippi sito ufficiale sito per scaricare musica furg una pistola per un vile test fotocamera digitali mv 750 canon fotocamera nikon 10x giochi tim sbs 350 night nurse decapitato com villaggi del ventaglio milano trieste biglietti aerei nomi cuccioli baciata john huston lotta per la vita gico tetris per computer locandina film the rock sla gasolina superfighetto it uv lampada concierto di aranjuez watt radio contax u4r oops sexy ratis hornet 2002 p4 2 4 flight sim keyserling, eduard von- donna orologi sector annuncio affitto biella cosa dancing with my lc 26p50e video cnn rivelatore gas novella grand hotel fleming violeta parra microonde combinato vapore escort girl frigorifero e congelatore classe a game boy zaffiro significado de la letra i scandalo a corte grazioli giocattoli decapitazione integrale listino prezzi ascensori boxoffice partituras de la ley nis 2005 upg foto auto elaborate tuning henryson o henderson, robert parma lamezia terme biglietti aerei manowar wheels of fire tutto va come deve andare sono le venti telepiu geometri hotel passo del tonale tesine chimica www goole com ar magix video deluxe 2005 plus atos auto scheda wlan gruppo pooh desnudo indiana jones nella rete lampada da terra illuminazione moto guzzi v11 sport weyrauch, wolfgang calendario ragazze del web giocho calcio waterfalls of the philippines frigoriferi da incasso classe a san giorgio a cremano samsung 710t monitor benq fp71g colpo grosso (dvd) generatori di trojan photos de chien donna fotografia symple red periyar dvi femmina vga maschio pixma ip4000r energy protector 600 codice penale vangog hidden scugnizza canon eos20d attrice italiana g glenn miller - la storia di glenn miller rebecca ferratti popeye. vol. 21 km0 smart fortwo diesel auto km 0 comunecusanomutri it compositor dale don nokia gps ipaq 36xx renault laguna benzina arenaria (zoologia) last minute it {| align=right |- | Relay |} 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

Example Relay Circuit

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

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