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 circuit was proposed by a 1965 Electronic Design. Its purpose is to widen the line transients...
The input of this regulator can be between 7 and 12 V and the output is 5 V. The circuit is from...
This circuit was found in the December 1983 issue of Radio Electronics magazine. The sensor is an...