NPN and PNP transistor tester (CB22146E)

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

MW Micro Transmitter (CB10523E)
This circuit was obtained in a 1965 American magazine translation. The coil is formed by 40 + 40...
Inverter using the CA3140 and Reinforced Output (2) (CB12309E)
We found this circuit in a 1991 publication. What it does is to amplify a signal with unit gain...
6 or 12 V x 1 A Regulated Power Supply (CB1168E )
This is the traditional configuration of a 6 or 12 V source with 7806 or 7812 integrated circuits, for a...