Ultra high gain FET amplifier (CB9065E)

Found in American documentation this circuit has a typical gain of 500 times. Other transistors can be used.

Sinusoidal Oscillator (MSB013E)
This circuit produces low frequency sinusoidal signals. The circuit is a phase shift oscillator...
Speaker Systems for Bench (CB17695E)
This 2009 circuit serves as an aid to those working on audio equipment repairs. With it, the...
1 kHz third order filter (CB12570E)
The circuit shown in the figure is a third order Bessel filter with unit gain using two...