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.
This circuit is from the time when cars used contact breakers. This 80's version measures the dwell...
In the fist circuit the alarm triggers on when any sensor is CUT. In the second circuit the alarm...
We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can...