Cowhock, when you're matching levels, are you actually using a signal coming through the mic, or are you connecting a test-tone where the mic would have been?

 

Using a signal through a speaker system. I don't think I really have the option to match the signals that well because the gain on the mic is used for sensitivity so the lights arent on all the time at the slightest sounds. So the gain of the amp and the amplitude of the mic output can only be played with in a certain range, otherwise the lights will on all the time or not flash at all. With the current gain pot of 200k I can achieve both extremes, so matching the input level wouldn't really fix the problem. I think it may be that the mic is just very susceptible to influences other than the pure audio of the music (or maybe echos in the room) and while its not perfect, the response is tolerable for most songs, and appears as though it may be unfixable.

 

It seems like in one of the posts I read that it was the 60 and 150 Hz lights (can't seem to find it now). If so you could lower the low frequency gain by making the 22 Ufd. smaller.

 

What is the purpose of the 47k at the input right before the 10uf cap?

 

Hello,

The 47 K determines the input gain in conjunction with the 120 K between pin 3 and 4.

The gain will be about 120 / 47 ≈ 3 X

Bertus