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Apr 13, 2017 at 12:32 history edited CommunityBot
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May 30, 2016 at 1:10 comment added Mark Just a note: If you use a photo-transistor optocoupler, you will need to make sure you have the polarity correct when wiring to the switch. If you us a FET optocoupler, like the H11F1, then you don't need to worry about polarity.
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