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

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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