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.
Found in Popular Electronics from 1969, this circuit uses a neon lamp from the time that had...
This receiver was found in the Radio Electronics magazine of March 1953. It tunes to the medium wave...
The figure shows how to use the XR2206 to generate sinusoidal signals in a different way. The...