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Parking and incoming call alarm circuit (1)
Source: InternetPublisher:国民男神经 Keywords: Alarm circuit potential rectification filtering Updated: 2020/10/08
Circuit working principle: lC is a 555 time base integrated circuit. When a call comes in,
the 220 V mains power is stepped down by R1, rectified by VD1 , stabilized by DW, and filtered by C2 to obtain
a DC voltage of about 12 V. When a call comes in, the VT base is at a low
potential because the voltage on C3 cannot change suddenly . VT is cut off and the collector is at high potential , causing pin 4 of the IC reset terminal to be at high level.
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