Looking for 120m fans that light up with music

Never heard of fans that do that but there are cathode controllers that respond to sound, although I've never looked into whether they are fed a sound signal from your soundcard or respond to actual sound. It might be possible to modify one of these cathode controllers to output to LEDs rather than a cathode but you may need to get busy with a soldering iron, resistors and transistors to make this vision a reality.

Building a circuit to respond to audio shouldn't be too difficult and as you are working with LEDs you could even have differeing levels of light for differing sound levels and even different colours if you are using RGB LEDs and are very clever.

Nice project if you do it.
 
Off topic: Those T-shirts are pretty nifty. The brightness of those LEDs is quite surprising.

On Topic: Not sure how you could get much from a LED Bar display driver to operate single LEDs but the idea was good.

I'd have thought you'd need some sort of amplifier to take the raw sound electrical signal and feed this into a transistor to power the LED. The sort of currents a microphone sees are very small.

The internet has dozens of different ideas but the simplest involves a TIP131 (I think it was) power darlington that takes the signal from an audio out cable (via splitter) and amplifies it enough to power a string of LEDs. There's so much wrong with this method but it does work, some of the time at least.
 
You can use a VU meter to drive the LED's like this one but it needs a sound input.
There are also some version with built in mic so that it will just pick up the sound through the mic.
 
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