This circuit is from a Radio Electronics from February 1966. The circuit is of a type that was found in many applications at the time as output from radios, televisions and other equipment.
This circuit doubles the frequency of a signal using a varicap. In this case, the input is 28 MHz,...
This receiver for infrared remote control was found in the Philips Databook of 1990, The circuit...
This traditional triac power control circuit can control loads up to 1000 W. The triac must be...