Logic probe (CB10024E)

This circuit was found in documentation from the 1980s. Transistors are general-purpose types like the BC548 for NPN and the BC558 for PNP.

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Tone-controlled microphone amplifier (CB20806E)
This circuit was found in American documentation from the 1980s. The integrated circuit used is...
Phase Shift Oscillator (CB12065E)
In the figure we have the traditional configuration of a phase shift oscillator that produces a...
Battery charger with current and voltage limiter (CB9537E)
This battery charger circuit was found in ancient American documentation. The components are...