Wolfson WM8740 DIR9001 PCM2706 DIY DAC

[cobretti]

Just finished mine. It surprisingly plays on first plug in, USB is no hassle to set up and sounds well. I did a quick comparison to iPod Nano (which is BTW better sounding than iPod Touch) and I have to say that playing through the USB is much better than playing the same file by iPod.
Like I wrote earlier, almost all parts seem to be fake, so I picked up all new stabilizers, new caps and resistors. I plan on changing OPamps as well.

[dtses]

few pics of mine.

[marchel]

Hi dtses,

Thanks for sharing.

Are those the original parts that came with the kit?

Are genuine parts?

[dtses]

hi marchel,

parts are from the kit except rectifiers. I'm not sure whether caps and other parts are genuine, however my Cerafines looks ok to me. Moreover, I have found them on ebay (though could be fake too) and seems to me to be some old series, not fake ones. As to the other parts - FCs, I do not see any point to counterfeit them, they are not so expensive, resistors as well... However I'm not an expert and do not have big experience in DIY like dozens of projects...

Perhaps I would change diodes to some high speed Schottky, all 47uf caps to Silmics and opams to some good metal LME49710HA.

Anyway, I'm not sure does it worth it as haven't made any decent tests against my heavily moded Philips CD350 or some other CDs but it's good to know that the DAC is better than iPod at least.

[cobretti]

dtses,
what are those two parts you put on markings designated 100p, located in front of the output jacks.?
Thanks.

[marchel]

Thanks

[dtses]

cheers cobretti!

seems to me that it's a cap in the output stage, pls see att. Not sure what is the purpose of it, but maybe someone could explain.

[dtses]

btw, I heard that film resistors are not good for the sound, so I'm thinking is there any point changing R100 (opamp output) to some decent wirewound one?!

[cobretti]

Originally Posted by dtses

cheers cobretti!

seems to me that it's a cap in the output stage, pls see att. Not sure what is the purpose of it, but maybe someone could explain.

Yes, it is supposed to be a capacitor (by the HK print) but I think you put resistor there instead.

[dtses]

as a reference I took this picture from some other seller. Moreover, checked this part with a tester according to the lines on it, got no impedance unlike on all other res, so I was thinking it's some kind of new Chinese cap. Correct me if I'm wrong.