We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as sensors and drives relays. The relays must have voltages according to the power supply.
This circuit was obtained from Linear Technology documentation from the 80's. Powered by 5 V it...
This factory circuit appears elsewhere on this site. This is from a 1975 National technical...
This circuit was obtained in a March 1995 edition of the American magazine Electronics Now. The...