Originally Posted by samwell7
Looks pretty sick, I'm a 3rd year electrical engineering student this looks like it'd be fun as something to do over holidays,
how does it sound? How long did it take you to make?
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I bought the parts from Mouser and a couple other places all listed in the BOM (bill of materials), and after getting everything together it took one day to plug and solder together. There are very meticulous instructions to follow and test as you go along. I didn't feel like I was rushing and it worked first time I tried it (amazing.) Make sure you read all his notes because you can upgrade sockets to gold plated if you like, trim part of the pot mounting feet to avoid a possible short etc...
It was a very enjoyable project.
I don't pretend to have measured it against anything else. I just know that I can listen to my headphones from the ipod and hear a real full sound--compared to before where I turned up the ipod all the way and it barely got loud enough--plus the sound was very thin.
There is no sound when you turn the amp on or off which means that its not throwing a big dc voltage during the turn on/turn off phase. I had originally built it with the 2 9volt batteries and occasionally would walk around with it, but now I took the batteries out and it just stays plugged in on my nightstand.
There is so much information that this NWavguy has written about you will probably enjoy going through it, I am a jr EE at heart and mess around with a variety of logic circuits and have a ball.
He is also working on a DAC that will be designed to fit into the O2 and that will require a custom back panel for the case but then I guess you can use it with your computer or what not to improve the sound coming out of that.