阐述了音频放大的原理，设计了以稳压电源、前置放大、音量调节、功率放大四部分组成的数字功率放大扩音器。

Expounds the principle of audio frequency power amplifier is designed for manostat, preamplifier, volume control, power amplifier four parts digital power amplifier megaphone.

youdao

阐述了音频放大的原理，设计了以稳压电源、前置放大、音量调节、功率放大四部分组成的数字功率放大扩音器。

Expounds the principle of audio frequency power amplifier is designed for manostat, preamplifier, volume control, power amplifier four parts digital power amplifier megaphone.

youdao