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Consumer Electronics by S. P. Bali

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BASS AND TREBLE CONTROLS

Figure 18.11(a) is a schematic representation that shows all the stereo preamplifier controls: bass, treble, volume and balance. The balance control is a 100k linear-taper potentiometer; all other potentiometers must have an audio taper. The audio taper applies a rather logarithmic characteristic to the control as shown in the taper graph in Fig. 18.11(b).

When the control is set at mid-position, 10 per cent of the total resistance of the potentiometer is on one side of the wiper arm and 90 per cent is on the other. When the control for the bass is set at mid-position, the response is flat down to about 50 Hz. When the treble control is set to the centre position, the frequency response of the high end is flat down to ...

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