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David Coil/C. R. Construction

U.S.
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I am a residential and small commercial contractor, and a licensed Electrical Contractor.

Dave Nyce

U.S.
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I have been an electronics engineer for more than 25 years. I can answer questions on analog and digital circuits, and my specialty is sensors.

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2011-12-31 VOLTAGE PRESENCE/ABSENCE SENSOR:

You could use a simple voltage divider with the 110VDC going through a 100k resistor, then through a 4.75k resistor to common.  The point between the two resistors (we'll call this the voltage tap) will

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