Audible Voltmeter (CB21395E)

This circuit was found in an American publication from 1969. Transistors are from the time and can be replaced by modern equivalents.

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Quartz PNP Oscillator (CB18933E)
This oscillator can generate signals up to about 10 MHz, depending on the crystal used. The...
Miller Oscillator (CB9649E)
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Zero crossing detector (CB20624E)
This type of circuit, found in American documentation from the 1980s, triggers producing output...