Loudness circuit using ordinary potentiometer

If you cannot buy a potentiometer with a tap, you can also use an ordinary potentiometer to connect it to a loudness control circuit. Figure 1-90 is another
two examples. The circuit in Figure (a) only uses RC components , but there are many components , which have a fixed attenuation of the signal , and the input impedance of the circuit
changes with the volume, requiring the preamplifier to have strong load capacity.