Digital Fuel Gauge (CB26173E)

This two-digit circuit was found in the 1999 Radio Experimenter Handbook. It uses the CA3161 and CA3162 A/D converter pair common at the time.

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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...