Found in an 80's Hands On Electronics, this circuit turns on a light when it gets dark and goes out when it gets dark. The circuit can be adapted to use high-brightness white LEDs.
This filter was found in old Raytheon documentation. The circuit makes use of operationals of the time, but...
March 2017 - Mouser Electronics already has the new Toshiba TLP3306 photo-relay and optical...
This circuit was suggested by Popular Electronics from the 90s. The circuit is quite simple using...