It is only when the correct voltages are applied to the A/C amplifier from the key inputs that the primary output (the A/C compressor relay) will be energised.
只有A/C扩大器上的电压是来自输入端的正确电压时，初级输出（即A/C压缩机继电器）才会被激活开启。
This AC electronic music door bell is composed of general electronic door bell, rectified power supply, relay and power amplifier and does not need battery to power it.
本发明涉及一种用交流电的电子音乐门铃，由普通电子门铃加整流电源、继电器及功率放大器构成。本发明不再需要电池供电。
Apply to protect electrical relay, POWER, amplifier and so on.
用于继电器、电源、放大器等电器元件保护。
This paper presents the principles and characteristics of the following modules: power amplifier, phase modulator and up converter, which are used in the transmitter of 1GHz microwave relay system.
本文介绍了用于微波中继系统发射机的功率放大器、调相器、上变频器等组件的原理和特性。
Relay IC3 opens, protecting the amplifier and clamping diodes.
继电器IC 3断开，保护放大器和钳位二极管。
Once the circuit is broken the amplifier detects the voltage change in this circuit and de-energises the magnetic clutch relay, turning the compressor off.
一旦线路断开，扩大器探测到线路上的压强变化，就会停止电磁离合继电器运行，关闭压缩机。
Optical Receiver; CATV products; optical Transmitter; trunk Amplifier; Subscriber Amplifier; Spliter; Taps; Optical Relay;
光纤放大器；光接收机； 光发射机；分配器；
Optical Receiver; CATV products; optical Transmitter; trunk Amplifier; Subscriber Amplifier; Spliter; Taps; Optical Relay;
光纤放大器；光接收机； 光发射机；分配器；
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