10 kHz Oscillator (CB21830E)

This circuit was found in a 1974 Ferranti transistor manual. The frequency is given by the capacitors, which can be changed.

Auxiliary Limiter Amplifier (CB16426E)
This amplifier avoids the over-modulation spikes of a dynamic or crystal microphone being...
Current Booster (CB6787E)
This circuit was suggested by Linear Technology in documentation from the 90s. The circuit applies to...
Transistor tester (CB21669E)
This bridge circuit was found in a 1960s book by Gernsback. The circuit tests general-purpose NPN...