This circuit for multiple sound inputs was found in a Radio Electronics from January 1992. It consists of a Bargraph connected to a multi-input mixer.
This mouse circuit was found in the January 1997 issue of Electronics Now magazine. It uses a PIC...
This signal follower or signal tracer was found in an English publication from 1989. The...
This article is from documentation from the 70s. The original text of A. Fanzeres was kept. In...