Diode Tester (CB22137E)

This diode tester was found in an English publication from the 1980s. Transistors are general-purpose types of the time.

Multimeter Adapter (CB2011E)
The purpose of this circuit, which we find in an old American documentation, is to allow the...
Electronic Dice (CB24370E)
This simple TTL electronic dice uses common anode displays. The circuit is from a March 1975 Radio...
LM386 Minimal Amplifier (CB25293E)
This is the basic version of a gain 20 amplifier with the LM386 providing a few hundred...