I've always wanted to know if something as simple as this circuit has any issues. I forgot to show that on the opto side that it's 5 volts. I've done it many times and it works flawlessly and there are many devices that interface with other equipment (my drawing is 2 pieces of devices) that use an open collector output instead of a relay. I guess if the diode shorted that would be a problem but I can't see how it could. -- anyway, thanks.
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