Cascade Current Amplifier (CB22246E)

This 50's setup has a balance control. The transistors are germanium types of the time, and the current is very low with a maximum of 1 mA.

Power Supply with Operational Amplifier 12 V x 500 m (CB1171E)
This circuit was found on a Radio Electronics of July 1984. It consists of a source with the 741...
Light transmitter (CB8786E)
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...
4 transistors 300 mW stage (CB23534E)
We found this circuit in a Radio Electronics from October 1963. The circuit uses an output...