继电器IC 3断开，保护放大器和钳位二极管。
Relay IC3 opens, protecting the amplifier and clamping diodes.
用于继电器、电源、放大器等电器元件保护。
Apply to protect electrical relay, POWER, amplifier and so on.
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.
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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