This circuit appears on this site from different sources. This is from documentation from the 1980s. The operating system used is uncommon and can be replaced by a more modern equivalent.
The circuit shown with the LM3914 was found in the March 1992 issue of Radio Electronics magazine. The...
This circuit was obtained from an English magazine from 1976. The circuit activates a sensitive relay...
The 8038 integrated circuit consists of a function generator with outputs of three waveforms. It...