VU Meter 5 with UAA180


This circuit of measurement of level uses the UAA180 of SIEMENS and a circuit of rectification of precision, round the IC2B. The calibration has become in steps 3db from the one Led in the other, ensuring, a very good rate of precision, in the measurement of entering acoustic signals. The Led can be square, thus when they are placed the one by in the other, they give the picture of bar, without space.

Circuit diagram

Circuit diagram

Part List

  • R1= 47Kohm
  • R2= 1Mohm
  • R3= 33Kohm
  • R4= 10Kohm
  • R5= 220ohm
  • R6-9=390ohm
  • R7=2.2K ohm
  • R8-10=330Kohm
  • R11=180Kohm
  • C1= 47uF 25V
  • C2-4=47nF 100V
  • C3=2.2uF 25V
  • D1....8= LED GREEN
  • D9-10= LED YELLOW
  • D11-12= LED RED
  • D13....17= 1N4148
  • IC1= UAA180
  • IC2= TL072

All the Resistors is 1/4W 1% metal film