Parking call alarm circuit

  
Circuit works: lC is a 555 IC. Incoming calls, 220 V electricity through R1 Buck, VD1 rectifier, DW regulator, C2 filtered to give 12 V DC voltage of about.
Parking call alarm circuit - schematic

When an incoming call, VT base due to voltage on C3 non-mutation showed low potential. VT cutoff, the collector is high potential, so that the reset terminal lC 4 feet high.




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