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Last Updated on:  03/22/2010 03:34:08 AM

Dark Activated 12v Power Supply Switch
designed by David A. Johnson, P.E.

Using an inexpensive phototransistor, this circuit switches 12v to 24v power to a load, whenever the sun goes down.
Click on Schematic below to view PDF version of this Circuit
Circuit 6V to 24V DC Day / Night Switch Circuit designed by David A. Johnson, P.E. (June 30, 2006)
 
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