华为模拟电路设计的pdf资料，分别介绍晶体管，放大器、振荡器电路等相关信息-Huawei analog circuit design reference, describing the transistor, amplifier, oscillator and other related information

2款简单而经典的麦克（驻极体话筒）放大电路，一款采用三极管，一款采用tda2822功放芯片。可用于设计扩音器的前端电路。-2 simple and classic Mike (electret microphone) amplifier circuit, using a transistor, a use tda2822 amplifier chip. Can be used for front-end circuit design loudspeakers.