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 of two transistors was found in a Japanese magazine in 1967. The transistors are made...
This levitation circuit keeps a small globe floating in space under the action of a magnetic...
We found this circuit that protects speakers against current surges that occur when the amplifier is...