Damped tone generator (CB8842E)

This circuit uses an unusual electromechanical component: a mechanical blade resonator. The circuit is from a 1965’s Electronic Design.

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High speed alarm (CB20663E)
Found in documentation from the 1970s, this circuit uses an oscillator and a display to warn of...
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This circuit indicates whether a cable or wire is energized by simply approaching its antenna. The...
Up to 10 hours timer (CB20360E)
Using bipolar, FETs and unijunction this long-lasting timer can reach 10 hours with good quality...