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PCM1704 Diy dac+ discrete i/v+ valve buffer
PCM1704 Diy dac+ discrete i/v+ valve buffer
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Old 5th February 2017, 07:39 PM   #1
abebernis is offline abebernis
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Default PCM1704 Diy dac+ discrete i/v+ valve buffer

Hi there,

As Diy "buddy" group, we decided on pcm1704 without thinking about what is best in choosing a dac chip. Fortunately we found pcm1704 chip (j) on farnell.

This is first test video:

https://youtu.be/DJlK1UpE_c0

Details coming soon...
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Old 6th February 2017, 08:52 AM   #2
abebernis is offline abebernis
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Dac pcb v2

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Dac pcb v1 was :

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Old 6th February 2017, 09:03 AM   #3
abebernis is offline abebernis
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V2 Changelog:
1. Added adm7150 on pcb for better pcm1704 +,- 5v feeding.
2. Fixed some incorrect pcb ways.
3. Better compenant placement
4. Added coax, spdif inputs
5. Added opamp or discrete i/v selection jumper

Last edited by abebernis; 6th February 2017 at 09:09 AM.
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Old 6th February 2017, 09:46 AM   #4
onkal is offline onkal  Turkey
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We are excitedly waiting for pcb v.2
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Old 7th February 2017, 05:45 AM   #5
mp3dragon is offline mp3dragon  Turkey
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we are testing rev1.0, sound is great!

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Old 7th February 2017, 06:57 AM   #6
starbender is offline starbender
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Why TI stopped production of this fine dac ic?
Is internal structure influenced from pcm69 from BB or is it equivalent?

Nice project btw! Keep up the good work.
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Old 7th February 2017, 07:26 AM   #7
abebernis is offline abebernis
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Quote:
Originally Posted by starbender View Post
Why TI stopped production of this fine dac ic?
Is internal structure influenced from pcm69 from BB or is it equivalent?

Nice project btw! Keep up the good work.
Thank you,
Really i am wondering too, why this chip's manufacture is stopped. Mostly old schooll hi end cd players had pcm1704. Maybe marketing strategy?
Maybe modern player's formats mismatches? But i really like its sound.

I think pcm63 is equivalent.
Replace PCM63 by PCM1704 DAC chip
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Old 7th February 2017, 07:46 AM   #8
mp3dragon is offline mp3dragon  Turkey
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Thank you,
Delta-sigma dacs more cheaper and more easy to production than r2r ladder dacs. But this shouldn't be the only reason. Why? I don't know.
PCM1704 a little bit better than PCM63. PCM1704 24 bit - PCM63 20 bit. 1704's SNR and DNR better than PCM63
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Old 28th February 2017, 10:39 AM   #9
mp3dragon is offline mp3dragon  Turkey
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Default new version pcb

some new version pcb's pictures
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Old 28th February 2017, 07:21 PM   #10
supra is offline supra  Australia
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Is the pcb available?
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