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'Opto-isolator Question [PIC@alliedpress.co.nz]'
1998\05\26@220352 by John La Rooy

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You could try two opto-isolators in a bridge. Turn one on with the
3-30V and the other one on with your PIC circuit. When the bridge is
balanced, the current through both diodes should be about the same.

Obviously the accuracy will depend on how similar the optos are.

John

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