NPN and PNP transistor tester (CB22146E)

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

Coded Infrared Transmitter (CB24829E)
This circuit for a 16-channel infrared transmitter was found in the August 1984 issue of Radio...
NiCad Charger (CB1188E)
We found this circuit loader in a French magazine Electronique Radio Plans from July 1993. The...
Nicad Charger (CB13543E)
This charger is from an old publication of 1975. The PNP transistor can be the BC558 and the NPN...