NPN and PNP transistor tester (CB22146E)

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

Ladder Generator 2N2646 (CB23914E)
This frequency divider circuit that generates a ladder-shaped signal was found in the June 1968...
Instrumentation amplifier (CB9830E)
This circuit is from American documentation. The components used are still common. The power...
Two-Power Selector Using Triac (CB515E)
When S1 is in 1, the circuit operates with of half the total power applied to the load. When in...