NPN and PNP transistor tester (CB22146E)

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

Non-Linear Amplifier (CB14075E)
We found this circuit in the Linear Applications Handbook of the National Semiconductor from 1994....
Metronome (CB18586E)
This metronome configuration with two transistors is well known to our readers and can be found...
Free Running Oscillator (CB5920E)
This oscillator, with an old operational from the 80's, was found in an American publication of the...