Transistor Tester (CB21956E)

This transistor tester was found in a publication by Gernsback from 1960. The circuit can be used with current transistors.

Graphic equalizer KA2223 (CB25943E)
This circuit was found in a Radio Electronics from April 1990. The circuit has 5 equalization...
Simple H-bridge (CB23725E)
The direction of rotation of the M motor can be controlled by an Arduino or another...
Metronome (CB15081E)
This traditional metronome configuration uses unusual transistors in the original version, but it...