Noise test circuit

The utility model discloses a noise test circuit, design measurement and control technology field, including audio acquisition module, audio frequency operational amplifier module, voltage comparatermodule, potentiometre adjusting module and acousto -optic warning module, audio acquisition module is used for collection sound sound signal to the sound sound signal that will gather carries on conveying after the two -stage is enlargied to the voltage comparater module through audio frequency operational amplifier module and handles, and command signal after the voltage comparater module is handled conveys the module to acousto -optic warning, the acousto -optic warning module is reported to the police or is not reported to the police according to the command signal of some cigarette comparator module conveying, potentiometre adjusting module is used for changing the warning numerical value that the voltage comparater module was set for. This circuit can detect the noise size that the power pack produced when ro