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.
of the National Semiconductor of 1994. The same technique can be used with other operators and the...
This is an interesting configuration of the LM317 voltage regulator found in an EDN from the 90s....
This circuit is from the datasheet of STMicroelectronics, being indicated for the voltage...