preamplifier

詳細解釋：

pre.am.pli.fi.er

n.（名詞）
An electronic circuit or device that detects and strengthens weak signals, as from a radio receiver, for subsequent, more powerful amplification stages.
前置放大器：電子線路或裝置，用來探測並加強無線電 * 所發出的微弱信號，從而使其達到更加有力的增幅程度