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 was found in a 1980s documentation for amateur radio. The circuit is for 9 MHz...
This circuit generates a linear sawtooth signal. The circuit was found in the December 1992 issue...
I found this simple basic circuit of rhythmic light in a 1980 documentation. We warn you to be...