poster: Santo posted date: 2009/05/30（土） 01:59 res number: 0
Hi there. Nice job, it must sound very good. I'm modifying my own little board with a PCM2704 also. I have noticed one thing that you have not done when you converted your board from bus-power to self-power: the 1.5K pull-up resistor on D+ should not be connected to 3.3V when the USB power is not available. I have thought of using an and gate to do this, but maybe a transistor may do just as well. Just a suggestion! Keep up the good work.
poster: kaczula posted date: 2009/04/19（日） 23:16 res number: 0
Awesome work mate! Very inspiring. I don't have your abilities, so I had to buy complete TA2020 amp ;)
You should just add (even small) heatsink to your amp. Also, these 'letters'on the back looks little cheesy (not levelled correctly, also power label should be 'dc', not 'ac' ;p)
Regarding speakers, full-range construction is very hard to built and usually it sounds much worse than proper multi-way loudspeaker (especially in terms of bass). But don't worry, I bet your next speaker will be much better!
poster: ovidiu posted date: 2009/03/17（火） 09:26 res number: 0
you made a great amplifier, but i have some questions : 1) why did you put a very large button on the potentiometer? on my opinion it whas very nice if u put a smaller one , and ad a tone control with 2 potentiometers 2) I see a big problem . Heat transfer, THE CHIP NEEDS A HEATSINK !!! you made the board putting the chip in the center, and this is a bad ideea, because you don't have space for a heatsink,The chip have a overheat protection , but .....
