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 found in an Argentine publication from the 1970s. The circuit can be assembled with...
This circuit uses only passive components and the instrument can be a microammeter or the lowest...
This circuit was found in a 1968’s General Electric documentation. The circuit has a control range of...