Sound Level Meter

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  • easy
  • Non tested

This nifty sound level meter is a perfect one-chip replacement for the standard analog meters. It is a 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.

Parts

C12.2uF 25V Electrolytic Capacitor
R11K 1/4W Resistor
D11N4002 Silicon Diode
LED1-LED10Standard LED or LED Array
U1LM3915 Audio Level IC
MISCBoard, Wire, Socket For U1

Notes

  • V+ can be anywhere from 3V to 20V
  • The input is designed for standard audio line voltage (1VP-P) and has a maximum input voltage of 1.3V
  • Pin 9 can be disconnected from the ground to make the circuit use a moving dot display instead of a bar graph display

Additional Circuit

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