Phone Patch (CB9398E)

This circuit was found in a 1969 CQ magazine. It is intended for coupling telephones to radio amateur equipment

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Motor Oscillator (CB3975E)
This circuit mimics the sound of a siren when we turn the axis of the small DC motor. The...
Complementary step with bootstrap (CB25621E)
This circuit has an input impedance of 10 M ohms. We found it in the October 1993 Electronics Now...
Universal Motor Control (CB1311E)
We find this circuit in documentation from the 1980s. The triac and diac are of conventional types...