This circuit was found in the July 1978 issue of Radio Electronics magazine. The circuit uses a common digital voltmeter as the indicator. The sensors are integrated circuits of the time.
This circuit controls the passage of the signal from an input to an output using a DC signal from a...
This amplifier with two transistors and unity gain was found in a 1974 Ferranti transistor manual....
Found in 1980s documentation, this circuit uses a small transistor radio output transformer and a double...