NPN and PNP transistor tester (CB22146E)

This simple transistor tester was found in old English documentation. Suitable for general purpose transistors.

Signal injector (CB21397E)
This circuit is from a Motorola documentation from 1968. The integrated one is an operational of...
Tuned audio oscillator (CB22254E)
This circuit is from a publication from the 50's. Inductive components are critical, and...
Power Flasher (CB18480E)
This flasher was originally intended for Christmas tree lamps. The circuit is from 1974 and uses...