| 过载保护电路功率为650mW，dianyuan电源电压12V，扬声器Ω。 部份元件规格： VT1：晶体管NB111EH/J VT2：晶体管NR001E VT3：晶体管NA11EB/J VT4：晶体管NAQWEB/J电路：  |
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