Published:2014/3/13 23:03:00 Author:lynne | Keyword: The doppler effect and double control automatic door light socket (RD627) circuit, RD627 | From:SeekIC
The circuit shown in FIG. It consists of the Doppler effect sensor head, light control switch, one-shot, SCR control circuit, vocal music buck rectifier circuit and the AC circuit. When a vehicle or pedestrian approached the front door, security door will open automatically, but will be broadcast on a melodious song.
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