This circuit operates from 20 Hz to over 20 kHz and is easily tunable. We found it in a 70s documentation. The circuit can be implemented with modern operational amplifiers.
This circuit produces low frequency sinusoidal signals. The circuit is a phase shift oscillator...
This 2009 circuit serves as an aid to those working on audio equipment repairs. With it, the...
The circuit shown in the figure is a third order Bessel filter with unit gain using two...