Test circuit with bridge (CB22530E)

This bridge-biased transistor test circuit measures gain in the range 0 to 300. Circuit is from Radio Electronics June 1952.

Dimmer with filter (CB25027E)
The figure shows how to implement a filter against interference caused by the switching of a...
Stepper motor control (CB12763E)
The pulses applied to input C of the SAA1027 integrated circuit determine the engine speed. Each...
30 W Transistor Amplifier (CB23659E)
This circuit was obtained from an old publication from 1974 but can still be assembled with some...