This low-pass circuit was found in the December 1990 issue of Radio Electronics magazine. The circuit is part of a home theater sound system.
June 2016 - It can be obtained from Mouser Electronics Power inductors for automotive use of...
This is actually an automatic dimmer we find in an American 1980s documentation. The triac must be...
This circuit is from an American documentation of 1975. The FET may be the BF245 and the relay is of...