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晶体三极管最重要的一个应用就是可以组成各种放大器,把微弱的电信号进行放大。如扩大器就是把话筒送出来的微弱电信号经过电压放大和功率放大,最后驱动喇叭发出较大的声音。在这里介绍一个简单实用的由三极管等分立元件组成的喊话器功率放大器电路。这个电路也可以作有源音箱的放大器。虽然现在广泛使用的是集成电路功率放大器,但是通过制做一个三极管功率放大器不仅能学到电路的基础知识,而且对了解集成电路功率放大器的原理也是十分有用的。
One of the most important applications of the transistor is to form a variety of amplifiers, the weak signal amplification. Such as the amplifier is the microphone sent out a weak electrical signal through the voltage amplification and power amplification, and finally drive the speaker to make a larger sound. Here to introduce a simple and practical by the transistor and other discrete components composed of the megaphone amplifier circuit. This circuit can also be an active speaker amplifier. Although the integrated circuit power amplifier is widely used nowadays, not only can the basic knowledge of the circuit be learned by making a transistor power amplifier, but it is also very useful to understand the principle of the integrated circuit power amplifier.