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Parking and incoming call alarm circuit (2)
Source: InternetPublisher:JFET Keywords: Alarm circuit BSP components Updated: 2021/10/13
Circuit working principle: The first group of electronic switches is composed of IC (photocoupler) and peripheral
related components . Its function is to notify of incoming calls. When the mains power supply is normal, the mains power
is stepped down by R1 and C1, bridge rectified by VD1~VD4 and filtered by C2 to form a win-current signal .
Then after passing through the ruler: current limiting, current flows through the light-emitting diodes in IC, and the photosensitive transistor
also Then conduction.
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