This circuit is from a March 1978 Radio Electronics magazine article that showed how to build it. The circuit is TTL based and is powered. The components used can still be found.
The presented circuit makes use of two hybrid modules (see articles on the website) to drive a...
September 2016 - It can be obtained from Mouser Electronics a kit for developing wireless remote...
Found in a 1990s American technical brochure, this circuit is intended for alarms that use as...