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##  問題1：如何把電磁鎖的接口信號轉化為3P線輸入信號？
如果要給舊的機關，增加音效，可以使用工業繼電器進行轉換。
![](https://box.kancloud.cn/64084a92a519fecd25b054ecbad72f56_1153x385.png)
如上圖，將原電磁鎖口，接入工業繼電器的線圈引腳。
一路開關，接入信號線的1、3線，信號線，接入音樂主控的輸入口即可。
音樂模塊的使用方法請見 [Smart主控系列-A0007音樂主控](http://www.hmoore.net/qdyxyc/smart/494416)

![](https://box.kancloud.cn/01f9682f20cebf6ad9b7da67392b2409_841x788.jpg =200x200)

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