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。
When its button is pressed once, the bell is triggered to play a music and then AC power supply is automatically cut off without error triggering.
当按一下按钮，门铃触发奏完一曲后即自动切断交流电源，不会误触发。可用来取代现有的电子音乐门铃。
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