Regenerative detector (CB20559E)

This circuit for a receiver was found in an English documentation from 1963.

The transistor is made of germanium. No information was given about the coils.

Colpitts Oscillator (CB4735E)
This is a possible setting for a Colpitts oscillator operating in the audio track. The shunt coil...
Limiter for AM and FM (CB4104E)
This circuit can be used in AM and FM receivers to cut off the peaks of a signal functioning as a limiter...
Solar cell series connection (CB20479E)
In the figure we have the way to connect solar cells in series in order to increase their voltage. The...