This circuit was presented in a January 1990 Radio Electronics magazine article as part of a home theater sound effects system. It consists of a 3 kHz high-pass filter.
This circuit was obtained in a 1979 101 Electronics Projects. The circuit can be assembled easily,...
Figure bellow shows how one of the two separated counters found inside the 4518 is used as a...
The circuit is from the Linear Application Handbook. The resistors determine the voltage applied to...