Make sure your optocoupler is properly biased
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Optocoupler simplifies power-line monitoring - EDN
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What is an Optocoupler, Optoisolator, Photocoupler » Electronics Notes
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Circuit compensates optocoupler temperature coefficient - EDN
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Optocoupler Relay Driver with PC817 & 2N3904
522 Series Optocouplers - Standex Electronics
