Condenser microphone pickup signal broken by Iq. amplified and sent as a comparator HJ of lC.., - LC.., And lC: (e - b) each of the negative side, the positive terminal of the
voltage comparison between wells. Output different detection levels, were light hair light: diode LEDl - LED7. The final show jumping corresponding audio level. VR. Ru and Rs a silk-linked to form a resistor ladder, unusual equipment is connected to the positive terminal of the comparator, the formation can delete the reference voltage.