Discuss 12v Relay in the Security Alarms, Door Entry and CCTV (Public) area at ElectriciansForums.net
I don't know about anyone else here but I learned to read a basic wiring diagram and how a relay works before I got to secondary school.
And I'm only 28 now so it wasn't that long ago!
I cannot remember a time in my life when I didn't know how a relay worked. I still have My First Relay that I made when I was about 7, SPNO and a very low resistance coil to work on a 1.5V battery, it would actually pull in on just under a volt. Dad reckoned it wouldn't have enough amp-turns to be reliable - he was right, but its limited performance taught me about contact setting, hysteresis, residual gaps etc. By the time I'd moved up to Junior School that was all old hat and I was buying relays and cradles from my favourite surplus shop in the Edgware road.but I learned ... how a relay works before I got to secondary school.
FFS it's a 2-pole relay, each pole has com, NO & NC contacts just like a 2-way light switch. Davesparks spelled this out in post #19. Choose a pole, any pole*, and use the NO and com of that pole.
I cannot remember a time in my life when I didn't know how a relay worked. I still have My First Relay that I made when I was about 7, SPNO and a very low resistance coil to work on a 1.5V battery, it would actually pull in on just under a volt. Dad reckoned it wouldn't have enough amp-turns to be reliable - he was right, but its limited performance taught me about contact setting, hysteresis, residual gaps etc. By the time I'd moved up to Junior School that was all old hat and I was buying relays and cradles from my favourite surplus shop in the Edgware road.
*not one with overhead cables or dancers on, North, South or one from Poland.
First time I've seen Lucien get agitated. Lol. Daz
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