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Consumer Electronics by S. P. Bali

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VOLTAGE CONTROL

With the oscillator, amplifier, and filter, a sound can be specified according to waveform, pitch, timbre and dynamic level. But without voltage control, a system consisting of these three building blocks has serious limitations. By using voltage control, the major parameters of the building blocks are made to respond to a dc or an ac voltage.

A voltage-controlled oscillator (VCO) has its pitch controlled not by turning a potentiometer, but by applying to it a control voltage .The cutoff frequency of a filter (VCF) or the gain of an amplifier (VCA) can be similarly controlled by a variable dc voltage.

For example, the amplifier shown in Fig. 25.3 has a conventional audio input but instead of using a potentiometer level control, ...

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