solid state relay, photoresistor-led case
thingiverse
v2: printed it, cap is too big for the case... slimmed it down. v1: haven't printed it yet. this is a bare-bones relay kit! add in a photodiode and an LED, use the LED as input and the photodiode as a switch. this completely isolates two circuits just like a relay does, but it's silent... probably faster and much cheaper.
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