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.
With this circuit it is possible to generate 3-phase rectangular signals from a clock signal. The...
This circuit was found in an American documentation from the 60's. The transistors are from the...
This crystal oscillator produces a signal in the 27 MHz band, depending on the crystal. The...