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.
This simple circuit can be used on both 110V and 220V mains. We find it in an 80's Electronic...
The transistor of this oscillator can be 2N2222. L1 is formed by 9 turns of wire 26 with a socket...
This circuit was obtained in a1969 magazine. The magazine no longer exists, but the circuit can be...