One of the high-pressure sensing alarm circuit

  
By the 555 IC A composed of a non-steady-state self-excited multivibrator. When the sensor very close to the high-voltage electrified body, the piezoelectric ceramic sheet B out alarm. When it is close to the frequency electric field, cricket issue vibrato; close when the electrostatic field, emit electrical flute-like sound straight.
One of the high-pressure sensing alarm circuit - schematic




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