Bipolar Current Level Detector (CB6629E)

The circuit shown was found in an American documentation from 1964. The circuit uses transistors of the time and the indicators are small lamps.

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Capacitance Bridge (CB22019E)
We found this circuit in an old English publication. The resistor not indicated can be 2k2 and the...
Assisted ignition (CB23557E)
This switching circuit for contact breaker cars was found in a Radio Electronics from April 1964....
Series and parallel alarm (CB26225E)
This alarm with sensors in series and parallel was found in the 1995 Encyclopedia of Electronic...