This week we must create a microcontroller with a sensor.
To make an inerhent machine with the final project I choose the sound branch.
With a google research I see Arduino audio input site, and I found this article.
Than I've seen the Attiny45 data sheet.

I made a schemathic prototype on Eagle and, to make tests, I used a breadboard.

An hard work was the research of a 5 Volts function of the board. It stole me a lot of time.

However I finally found it, and made my definitive board.
I made the board using the Fab Modules as always.

I connected on the oscilloscope and it worked good, however I noticed an electrical power problem. Eve if arduino work with 5V, it dosn't work proprly, forcing me to use an external power source.