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Sound Level Meter

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  • MultiMedia SRL
    Sound Level Meter ... This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will
    Message 1 of 2 , Jan 29, 2003

      Sound Level Meter


      This nifty sound level meter is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out. The whole circuit is based on the LM3915 audio level IC and uses only a few external components.

      Schematic


      Schematic for sound level meter

      Parts


      Part
      Total Qty.
      Description
      Substitutions
      C112.2uF 25V Electrolytic Capacitor
      R111K 1/4W Resistor
      D111N4002 Silicon Diode
      LED1-LED1010Standard LED or LED Array
      U11LM3915 Audio Level IC
      MISC1Board, Wire, Socket For U1

      Notes

      1. V+ can be anywhere from 3V to 20V.

      2. The input is designed for standard audio line voltage (1V P-P) and has a maximum input voltage of 1.3V.

      3. Pin 9 can be disconnected from ground to make the circuit use a moving dot display instead of a bar graph display.

      http://www.aaroncake.net/circuits/index.asp

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