Blinky

After coming across this site, I wanted to make a music visualizer.
The circuit by Mr. Andrade works well for others, but not for myself, so I went ahead and put together my own.

Parts Needed:
1 x 9V Battery
1 x Standard 3.5mm Male Plug (if plugging into a headphone jack like me)
1 x 100K Resistor 1/4W
1 x 22K Resistor 1/4W
1 x 470 Resistor 1/4W
1 x LED (or 2)
2 x General Purpose NPN Transistors (BC547 in my case. I had them lying around)

Below is the schematic with the input coming from one of the channels given by the 3.5mm plug:



This is essentially a simple darlington pair amplifier to drive up the current and voltage coming from my soundcard's headphone jack.
2 LEDs can be used while still keeping things looking fairly decent. More LEDs can be added in parallel, but be sure to keep an eye
on the current draw. Check out the sample video below.

Sample video