PUBLIC ADDRESS AMPLIFIERS
A PA amplifier may be designed as a unit, or it may consist of separate amplifiers. When more than one audio input source is utilised (two-microphones, for example) operating controls are provided to change from one source to the other, or to mix the outputs of the sources, The mixer and fader section is designed to provide flexibility of operation without sudden increases or decreases in volume. A fader serves to gradually reduce the volume of one source while gradually increasing the volume of another source. A mixer may or may not provide fader action.
Fig. 26.17 Amplifier input arrangements; (a) a fader circuit ...
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