Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

Capacitance multiplier (CB7803E)
We found this circuit in an old Popular Electronics. The circuit can be applied to other...
27 MHz Converter (CB16876E)
With this circuit it is possible to receive the signals from the 11-meter band (27 MHz) in a...
60 V Bidirectional Motor Control (CB19568E)
We found this circuit in an American publication from the 90s. The transistors must be provided with...