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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Astable LED (CB12038E)
This astable multivibrator configuration causes two LEDs to alternately flash at a frequency...
Simple Touch Switch (CB15424E)
In the figure we show our first circuit that consists of a simple touch switch capable of driving a...
EMG Monitor (CB13793E)
This electromyography monitor is from a 1978 publication on operational amplifiers. The components are...