This very detailed Dimmer was found in an English documentation from the 90's. The SCR could be a modern equivalent like the TIC106. The circuit is only suitable for incandescent lamps.
This transmitter, indicated for espionage applications, is permanently powered by the power grid....
This signal follower or signal tracer was found in an English publication from 1989. The...
This circuit appeared in a Radio Electronics magazine in March 1962. The circuit uses two...