Single crystal radio (CB22170E)

Found in English documentation from the 1980s, this circuit can use any germanium diode. The earphone can be crystal or high impedance magnetic.

Jacob's Ladder (CB25903E)
A Jacob's ladder is a high voltage effects device in which a spark passes between two V-shaped...
Electronic Vibrator (CB20061E)
This 1975 circuit for automotive applications replaces the mechanical vibrator found in old cars...
The Transistor as Switch (CB922E)
This circuit can be used as shield or to drive powerful loads from low current switches such as...