60's crystal radio (CB22171E)

Found in an English publication from the 1960s, this circuit uses period components, including the commercial grade coil.

2W lamp driver (CB20720E)
This circuit for 12 V x 2.2 W lamps was found in a documentation from the 70's. The circuit uses...
Asymmetric Converter (CB19915E)
This voltage inverter allows you to raise the voltage of a battery to values as high as 140 V...
Square wave generator 709 (CB24193S)
Using the 709 integrated circuit, one of the first operational, this circuit was found in the...