Multi power failure alarm circuit

  
Circuit works: This is an AC blown fuse alarm. When BX is not when blown, 220 V AC voltage through a VD1 VD4 bridge rectifier, R1 limiting buck, after DW 6V DC
Multi power failure alarm circuit - schematic

voltage regulator, C1 filter formed by R2, VD5 (isolated from the action) is applied to the power switch IC TWH8778 4 feet, 4 feet high power level, TWH8778 off does not work, the speaker does not sound.




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