I have successfully replaced a push button with an optoisolator for arduino control of an unknown circuit. Everything works fine so far but I wish to know if I might run in to trouble later. I measured the current across the switch of the unknown circuit as 1.6mA. I'm using a Sharp pc817 optoisolato…

replacing pushbutton in unknown circuit with optoisolator

Cue2 March 31, 2013, 12:16pm 3

Hi dc.
I have, it's ~12V. The pc817 has the following max ratings on the output:

Collector-emitter voltage, V_CEO: 35 V
Emitter-collector voltage, V_ECO: 6V

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