Simple 1-tube receiver (T960E)

This 1V heater tube circuit was found on a Radio Craft from 1945. The circuit is for medium wave and can be used as a tuner.

Simple Transistor Tester I (CB18917E)
We found this simple transistor tester in a French publication in 1981. It uses a common analog...
Speed Game (CB22072E)
Who is faster? or reaction game are other names for this circuit that we find in old...
Photodiode Amplifier (CB4950E)
This circuit is from an 80's component manual. The components are from the time, but the circuit...