The utility model is composed of a guard circuit, an oscillating circuit, a power amplifier circuit, a volumecontrolcircuit, an accident noticing circuit, etc.
本实用新型由防护、振荡、功放、音量控制、故障通知等电路组成。
2
The volumecontrolcircuit is composed of a programming switch and a computer storing magnifying executive circuit, and can realize the automatic alarming volumecontrol.
音量控制电路由编程开关、电脑存储放大执行电路构成，可实现报警音量自动控制；
3
In this article an audio controller, which USES digital circuit technology instead of original analogue components to control channel selection and volume adjustment, is proposed.