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 analog voltmeter with great sensitivity and input resistance has a traditional configuration found in...
This circuit is used to turn on the headlights when it gets dark. The circuit is from an...
The indicated circuit is based on the National Semiconductor LM3524 which is not an easy component to...