battery-supply relay
... battery-supply circuit 电池馈电电路 battery-supply relay 电池供电继电器 battery power supply system 混合供电制 ...
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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。
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.
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