This passive loudness control was obtained in an old publication. The critical component is the tapped potentiometer that can be adapted with an external resistor network.
This high impedance and low capacitance buffer employs a junction FET that can be BF245 or...
Found in 1980s documentation, this amplifier uses a symmetric source and the gain is given by the...
This circuit was found in an old documentation for radio amateurs, being indicated for...