So I play the ukulele sometimes and a couple of weeks ago we had a talent contest and I want to make a Uke-O-Meter applause meter. Was thinking of making a fake uke that has lights running up the fretboard. The more clapping, the more lights lighting up.

Found some dot/bar drivers on the web and found this great site.

Any advice would be great.

Thanks,

Dave

 

Audioguru recently posted a circuit that does precisely that.
It's in this thread:
http://forum.allaboutcircuits.com/showthread.php?t=10798

Note that the op amp he's specified is available very cheaply at www.AlliedElec.com
Direct link:
http://www.alliedelec.com/Search/SearchResults.asp?N=0&Ntk=Primary&Ntt=MC33172&sid=48029E806DFCE17F