In addition to tone control, this circuit of the SGS 1982 linear integrated circuit manual has a loudness control. The supply must be made with a 24V voltage source.
Found in an Elektor from the 90's, this double door-bell drive circuit switches a relay by...
July 2017 - Mouser Electronics announced the availability of Littelfuse's GEN2 series Schottky...
This circuit is from a 1976 documentation. It uses an operation that is still common in our...