Light test (CB8789E)

This light-sensing probe was found in a 90s Popular Electronics. The circuit detects light sources by triggering a buzzer.

Modulated Function Generator (CB24255E)
This circuit is from the July 1973 Radio Electronics magazine. The circuit is based on the XR-205,...
Lamp Switching by One Pair of Wires (CB4157E)
Indicated as a joke or challenge this circuit shows how it is possible to control two lamps using...
LMU1610 UV LED (COM086E)
September 2016 - Mouser Electronics is providing new ultraviolet LEDs VLMU1610 of Vishay suitable...