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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1 MHz Pierce Oscillator (CB8050E)
The frequency of this Pierce oscillator, found in 1969 documentation, depends on the crystal. The...
0 to 20 second timer (CB20370E)
This simple timer with unijunction transistor was found in an old American technical...
Power supply with voltage quadrupler (CB22343E)
Found in documentation from the 1960s, this power supply employs germanium diodes from the time....