I want to control doorbell solenoids (12VAC low current, highly inductive) from microcontroller logic (5V TTL or 3.3V CMOS, a few mA available); is there an economical SSR or triac for this function, or is it best left to electromechanical relays?
martin
If it's under 500 mA, there are lots of optoisolators/photocouplers that can handle it ( MOC3063 is under $1 and has phototriac output). Inductive nature of the buzzer might not be a big issue, because the phototriac turns off at zero current (no stored energy).
Do you really need it to be isolated? If not there may be many lower cost ways to do it.
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