We found this touch control on a Popular Electronics from 1970. The circuit makes use of an integrated of the time. It can be adapted to use modern equivalent components.
The shunt type regulators are connected in parallel with the load, deflecting the current to...
This circuit for multiple sound inputs was found in a Radio Electronics from January 1992. It...
Suggested by an American documentation for 1969 neon lamps, this circuit provides SCR control with...