This amplifier with antique germanium transistors is from a 1968 publication. The circuit provides some watts of power with excellent sound quality. This is the configuration used in commercial equipment of the time.
This circuit generates audio tones in a speaker with controlled frequency and volume. The...
This circuit is from a Radio Electronics from August 1992. The transistor used allows the control of...
For the low channels (2 to 6) the coil is formed by 5 turns of wire 20 or 22 in a form of 1 cm...