Color music from hard drive

I present to your attention another color music, or rather it would be a volume level indicator, since it is a column of LEDs which turn on one after another depending on the output signal of the audio amplifier. For these purposes, I used the UAA180 microcircuit; you can also take the K1003PP1 and A277D, these are all complete analogues of each other and turn on in exactly the same way. Each of these chips is a driver for 12 LEDs. In addition to the fact that it can be used as a color music device, this microcircuit can also be used as an elementary voltmeter with a measurement threshold of 6V. But I still decided to collect color music.
And so I decided to use a hard drive enclosure for these purposes. First, we actually need to disassemble the hard drive and remove from it what we don’t need.




Next you need to take LEDs and solder them into a ring, I used super bright ones LEDs with power supply at 3v. You can use almost any that you can find.
We solder and place them in place of the disk itself




After everything LEDs will be soldered and laid, I advise you to fill them with hot glue or, in extreme cases, regular glue.



Now you need the control chip itself, which is also quite easy to assemble, and so here is the driver circuit itself.



Everything is simple here, this is how contacts are counted on UAA180



After this, we solder the LEDs to the circuit using wires



We connect and check and everything should work the first time. To check, you can connect 5 volts to the input and rotate the potentiometer to see how the microcircuit reacts to changes in the input voltage.
We connect the output from your audio amplifier to the input of the microcircuit and everything will work fine.






That's all, I also want to share an idea that I was unable to implement. In theory, if you can force the hard drive to rotate and make a small slot in it parallel to the radius, you may be able to achieve a disk glow effect similar to the effect you get in HDD Clock. I was not able to get the complex three-phase hard drive motor to rotate constantly.
Good luck to those wishing to repeat!