Tunnel diode simple noise generator (CB23705E)

This circuit was found in Radio Electronics magazine from November 1960. The circuit is powered by a photocell of the time.

SCR Dimmer (CB14822E)
This traditional dimmer configuration for incandescent lamps and heating elements was found in an...
Negative Voltage Generator (CB16629E)
This is another possible version of a negative voltage generator using a 555 integrated circuit. The...
Vibrating Wire Oscillator (CB23899E)
A wire vibrating between the poles of a magnet works as a frequency pattern in this oscillator found in...