This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz to 100 kHz and modern equivalent components can be used. The circuit is from Ferranti.
This three-transistor amplifier uses a JFET at the input to increase the input impedance. The...
Lamps in the range between 20 and 50 mA can be used. Voltage supply is according the lamp and...
This fuzz uses only one transistor that can be the BC548. Signal input and output cables must be...