This simple circuit needs a high gain stage to compensate for losses. It consists of a passive tone control obtained from Electronics Today International of the 90s.
This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a...
Found in a 90s Radio Electronics, this circuit can supply currents of a few amps, according to the power...
This circuit uses two transistors, the low noise BC549. Its quality is very good and it has a...