This circuit was found in the February 1980 issue of Radio Electronics magazine. The digital circuit was shown in two parts, using 20 LEDs in a configuration with the LM3914.
This control, which may appear in other versions on this site, was found in documentation from the...
We found this circuit in a Motorola documentation from 1978. The circuit is based on the LM324...
We found this circuit in an American 80's documentation. The circuit can be adapted to function as a...