How to build VU Meter 3

August 8, 2010 - category: Sound level meter


A very simple circuit of indication of level, with 10 Led. Is used the circuit of half-wave rectification of precision round the IC2, with gain one. With switch S1, we can select the indication of Led. The level of entry is 60 mV-1.25 V.

Circuit diagram

Circuit diagram

Part list

  • R1-2=10Kohm
  • R3-4=1Kohm
  • D1-10=LED
  • D11-12=1N 4148
  • C1=10uF 25V
  • C2=1uF 25V
  • S1= mini switch
  • IC1=LM3915
  • IC2=TL071

circuit from http://users.otenet.gr/~athsam/vu_meter_3.htm

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