Battery Charger (CB26303E)

This automatic battery charger was found in a Popular Electronics from the 90s. The circuit uses a relay for automatic shutdown.

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Powergrid timer (CB9364E)
Found in an Elektor from the 90s, this circuit can be powered directly by the power grid. The...
2-transistor amplifier (CB23760E)
This amplifier was published in the July 1961 Radio Electronics magazine. It announced the release of...
DC PWM Motor Photocontrol (CB11855E)
The speed of the motor connected to this circuit depends on the amount of light that strikes the...