Preamplifier definition

prē-ămplə-fīər
An electronic circuit or device that detects and strengthens weak signals, as from a radio receiver, for subsequent, more powerful amplification stages.
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In a radio, phonograph, etc., an auxiliary amplifier for boosting the voltage of a weak signal before it reaches the input of the main amplifier.
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A voltage amplifier for amplifying a low-level input signal; its output is the input to a higher-level amplifier.
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Other Word Forms

Noun

Singular:
preamplifier
Plural:
preamplifiers