vu meter

  
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The 1K resistors in the circuit are essential so that the LED`s turn on at different audio levels. This circuit is easily expandable with more op-amps, and is not limited to use with the LM324. The 33K resistor on the schematic is to keep the signal input to the circuit at a low level. The circuit in it`s current form will accept line level inputs
vu meter - schematic

from sources such as the aux out on a Hi-Fi, all though could be easily modified to accept speaker inputs.



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