Is composed by 5 parts:
1-The box ( originaly a whine botlle box).
2- String of leds (are these that interact with the music).
3- Backgroud led´s ilumination with light intensity regulation.
4- Board with microphone and respective instrumentation, the output signal goes to an input in Attiny85
5- Board that:
5.2- Have a Attiny85, that is programmed to receive the output from a microphone.
5.3- Have a IC ULN2803AN, to deliver de necessary current to the string of Led's (over the limit of output current of Attiny85)
Step 1: 1- the Box & Row of Leds
The row of Led are separed in 4 parts each one have 4 leds placed in series.
The 4 parts are connected in parallel.
12V are applied at each row of leds.
Step 2: Capture the Sound
I bought the mic here:
The digital output of this board was connected to pino of attiny85.
Step 3: Back Light Illumination
12V were applied.
Step 4: Main Board
The ULN2803AN is necessary because the current necessary to feed the rows of Leds its superior than the output current of Attiny85.
The main source is made by a transformer of 12V.