I am wanting to put have a few LED's flash with the intensity of my music. I don't need a color organ, but just want the LED's to flash in sync with the music. I am amplifying the signal with a LM368 chip and playing music from a 4ohm 3W speaker and it's sound quality is great. The problem is my LED's don't turn on at all..
I am using the configuration that many people claim works well but its usually done with a TIP31 transistor and not a 2N3904. I tried inserting an opAmp with a gain of 10 before the base of the transistor with no success.
Does anyone see a problem with my circuit or know of a reason the LED's arn't turning on? Any advice would be appreciated