| 释义 |
preˈamplifier
[pre- A. 2.]
An amplifier designed to amplify a very weak signal (as from a microphone, pickup, or similar source) and deliver it to another amplifier for further amplification.
1935Television VIII. 654/1 This pre-amplifier brought R4 signals up to consistent full loud-speaker strength. 1952Electronic Engin. XXIV. 498/1 The low output signal obtained from a pick-up necessitates the use of a preamplifier. 1957New Yorker 2 Nov. 95/2 Bogen RR550 DeLuxe FM-AM Receiver with built-in Preamplifier and Power Amplifier. 1965Wireless World July 33 (Advt.), Transistor A.C. Microvoltmeter... Ideal as an oscilloscope preamplifier as it has a low noise level, low microphony, no hum and is independent of a mains supply. 1977Gramophone June 117/1 Between the preamplifiers and the power amplifiers there are four Urei 527 A 1/3-octave equalizers. |