room noise detector

[ssivasssss]

i need help to construct room noise detector circuit that monitor 3 levels through a single led please give modifications done to circuit availkable in net

 

[audioguru2]

i need help to construct room noise detector circuit that monitor 3 levels through a single led please give modifications done to circuit availkable in net

You forgot to provide a link to our Room Noise Detector project: http://www.electronics-lab.com/projects/sensors/012/index.html

It has a switch to select which sound level causes its LED to light.

How can a single LED show three different sound levels? EDIT: An RGB 3-colours LED?