replacing pcm1716 with wm8740 ?? - diyAudio
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Old 26th February 2003, 06:55 AM   #1
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Default replacing pcm1716 with wm8740 ??

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.
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Old 26th February 2003, 08:07 AM   #2
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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.
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Old 3rd August 2004, 10:43 AM   #3
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Hi mekanoplastik
did you manage to swap the 1716 for the 8716.?Was thinking of trying it in my Pioneer 717 dvd player
Smiffy
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Old 5th August 2004, 11:35 PM   #4
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i got the components..but i never replaced them


try and report back
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Old 6th August 2004, 10:33 AM   #5
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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.
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Old 6th August 2004, 11:17 AM   #6
hjelm is offline hjelm  Sweden
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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?
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Old 6th August 2004, 12:48 PM   #7
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Thanks for the link Hjelm

will have a good read later

Smiffy
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Old 7th August 2004, 12:04 PM   #8
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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
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Old 7th August 2004, 05:16 PM   #9
hjelm is offline hjelm  Sweden
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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.
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Old 7th August 2004, 05:22 PM   #10
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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.
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