Circuit - Light Dependant Resistors Electronic Circuits Designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Friday, March 23, 2012 08:38 AM

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Light Dependant Resistors Circuits

24vac Powered Day/Night Switch
Many low voltage outdoor lighting systems use 24vac to power the devices. The low voltage is much safer to use outside than standard 120vac or 240vac power systems. The circuit below is designed to turn off power to outdoor lights during daylight and turn them back on at night. The circuit uses a phototransistor to detect daylight. I would suggest you use a phototransistor which has a built in daylight filter. These are colored a deep purple. The filter helps insure the circuit reacts only to sunlight.....[Designed by David A. Johnson]

Dark Activated 12v Power Supply Switch
Using an inexpensive phototransistor, this circuit switches 12v to 24v power to a load, whenever the sun goes down. (added 7/06)

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