Suggested by General Electric, this circuit with triac is able to reverse the rotation of a motor through a DC control signal. The circuit applies to AC servos.
This fuzz distortion circuit was found in old RCA documentation. Equivalent transistors may be...
This circuit with transistors of the time was found in the magazine Radio Electroinics of June of...
Several versions of this circuit can be found on this website. This makes use of FETs that can...