The core of this method is the selected-frequency amplifier.
而选频平衡法的核心是选频放大器。
Purpose: Low frequency power amplifier.
用途： 用于低频放大。
Purpose: General amplifier and video frequency output in small screen TV.
用途：用于普通放大及小屏幕电视机视放电路。
Purpose: General amplifier and video frequency output in small screen TV.
用途：用于普通放大及小屏幕电视机视放电路。
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