This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549 and should be battery powered for noise sensitivity. Diodes are commonly used.
In the figure we present an interesting application suggested by Microchip (www.microchip.com) in which the voltage...
This audio amplifier uses 3 transistor in a traditional configuration named complementary output....
This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced...