This TV remote control receiver uses a ratchet system to activate an old drum-type selector to change channels. A common system at the time. The circuit is from a Radio Electronics from February 1961.
This charger for a maximum current of 15 A was obtained from an American 80's schematics. The triac must...
This circuit is from the 1971 Motorola SCR Power Control Fundamentals. The circuit can be made...
This circuit, published in 1988, uses several types of sensors and relays to activate warning...