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电路及元器件基本知识 1.低频小信号放大电路 前文所讲的“音频信号功率放大器”,较全面确切地讲应称音频放大器、低频放大器。大多数音频放大器通常包括用以增强音频信号电压的放大器和以获得足够音频功率输出(以推动扬声器或耳机)为任务的放大器两部分电路,前者常称作音频电压放大器、低频电压放大器或低频小信号放大器等,后者便是音频或低频功率放大器。 低频小信号放大电路是最基本的交流信号放大电路。我们在“入门新路(15)”中介绍的多路音乐报讯对讲机,其图1原收音机低放部分电路中,音量电位器之后的一个三极管就
Basic knowledge of circuits and components 1. Low-frequency small signal amplifier circuit As mentioned above, “audio signal power amplifier,” more comprehensive and exact should be said audio amplifier, low-frequency amplifier. Most audio amplifiers typically include an amplifier that amplifies the audio signal voltage and an amplifier that performs the task of obtaining adequate audio power output (to drive the speaker or earpiece). The former is often referred to as an audio voltage amplifier, a low frequency voltage amplifier, or a low frequency Signal amplifier, the latter is the audio or low-frequency power amplifier. Low-frequency small signal amplifier circuit is the most basic AC signal amplifier. We introduced in the “Getting Started New Road (15)” multi-channel music newspaper walkie talkie, the original radio in Figure 1 part of the low-volume circuit, the volume potentiometer after a transistor