Found in a 1967 RCA power manual, this circuit uses an ordinary neon lamp to fire a triac. The circuit is for the 110V network.
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...
This circuit was found in an old American magazine and could make use of more modern components...
This circuit is from the Philips integrated circuits manual of 1990. It is intended for magnetic...