Hello I am looking for a way to add 8 inputs to my data logger circuit. I want to be able to detect the presence or absence of a voltage/current from 24 vac to around 560 vac. Isoltated from the micro's port via optoisolator. Using resistors to get 1 ma at 24 drops several watts across the resistor at 600. Using caps I end up with large capacitors and a lot of board space. I need only 1 ma or so to activate the opto's ir led. So any ideas? Tony
- posted
15 years ago