replacing pcm1716 with wm8740 ??

[mekanoplastik]

Hi all.

I have a cd player that uses the pcm1716 dac and I thought that maybe it could use a better chip to achieve better sound. I found the wolfson wm8717 and wm8740 as a pin by pin replacements, and I would like to know if it is a good idea to replace the pcm1716 with the wm8740.

Here is a link to the wm8740 specs -> http://www.wolfsonmicro.com/product.asp?pid=7

And this links to the pcm1716 .. -> http://focus.ti.com/docs/prod/produc...Number=PCM1716


if anyone has a better replacement chip idea… let me know…

thanks
m.

[mekanoplastik]

actually...I made a typo or two ...


the replacement would be the wm8716 replacing the pcm1716....


wn7816 info -> http://www.wolfsonmicro.com/product.asp?pid=3

m.

[Smiffy]

Hi mekanoplastik
did you manage to swap the 1716 for the 8716.?Was thinking of trying it in my Pioneer 717 dvd player
Smiffy

[mekanoplastik]

i got the components..but i never replaced them


try and report back

[Smiffy]

Haven't got the bits yet,specs look better than 1716 but i think i may be pushing my luck a bit on the soldering skills.should be able to put them on,its getting the old 1716s off thats worrying me.seems a bit more complicated than swapping the 5532s for AD8620s was.
Smiffy

[hjelm]

There is a WIKI page for SMD soldering and desoldering where it is described how you could do it. Seems like it is not impossible at least. Please report the results i have a PDS507 that sounds like crap and i want to fix it, have replaced opamps and fiddled with the supply with good results but still not really enjoyable.

Does anyone have a feel for if the wolfson DAC's sound good?

[Smiffy]

Thanks for the link Hjelm

will have a good read later

Smiffy

[Smiffy]

Does anyone know how high much dc on the output i can get away with.The amp has an input cap,(MF F16)At the mo i am measuring 3-6mv at the input of the final caps.If poss i would like to pull them out as even the best cap in the world isn't as good as no cap at all.
Ta for any help
Smiffy

[hjelm]

Should be fine i think.

Depends a bit on where the input cap on the amp is located. If it is after the input selector you could get a bang when switching source, especially at high volume.

Do remember that you might have offset on the output if you ever change amp later.

[Smiffy]

Hi Hjelm
Ta for assistance
not quite sure about some of these things so better safe than sorry
No input selector as straight power amp(although 2 way selector in me pot in a box so maybe same thing),first thing on input of amp is a 1uf cap which seems a low value.
Smiffy