Hk Dac Pcm 1704 - Page 2 - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 20th May 2004, 12:41 PM   #11
diyAudio Member
Join Date: Jan 2004
Default Distorted output

I've removed the opamps and checked the output of the DACs and it's the same - distorsion.

I've bypassed the TTL input circuit, no change.

The distorsion is low when digital input volume is very low, otherwise 99% distorsion.

?? I'm checking the pcb for errors

Any ideas?
  Reply With Quote
Old 20th May 2004, 01:33 PM   #12
diyAudio Member
Join Date: Jan 2004
There is a difference on PCB compared to schematics regarding the DF1704:

It is wired as if MODE=software but no connections to most control pins:

pins 3,4,5,7,9,10,11,12,13,15,16,17,18,27 are floating

pins 19,20 are HIGH

I wonder what the default software registers are set at. I've checked the datasheet and no mention of defaults....
  Reply With Quote
Old 20th May 2004, 01:50 PM   #13
Join Date: Feb 2002
Location: As far from the NOSsers as possible
Look on page 9......your answers are there.

Anywa, I don't think that is your problem. You could always ground pin 9 just for grins: it should operate the same way.

  Reply With Quote
Old 20th May 2004, 03:04 PM   #14
diyAudio Member
Join Date: Jan 2004
Default Sound of DAC

Here is the distorted sound:

dac_distorted MP3 (465K)

Here is what it should be:

dac_source_ref MP3 (465K)

I was wrong that the bass is distorted, seems ok.

Is this digital overload or analog????
  Reply With Quote
Old 20th May 2004, 06:22 PM   #15
diyAudio Member
Join Date: Jan 2004
I can't see the default settings of the registers on page 9...

I see a table with the software registers at page 10 \, but it is not indicated what are the defaults. When the IC is left floating, what is the setup?
  Reply With Quote
Old 21st May 2004, 12:39 AM   #16
diyAudio Member
Join Date: Jan 2004
Default Working DAC!

I found the problem !

The CS8414 was not configured for I2S output. This was supposed to be wired on a small carrier board which mounts on the main PCB. Thanks for the help.

The DAC sounds very good. I can only compare to CI Audio VDA1 and optional VAC1 power supply. It sounds better, soundstage much wider and accurate, qualities that CI Audio had in the top range now are present in midrange and at lower freq (dynamics, etc).
  Reply With Quote
Old 22nd June 2004, 07:14 AM   #17
diyAudio Member
Join Date: Sep 2002
Location: Rosmalen, The Netherlands
Default Ordering from DIYclub

Hi mfr,

I saw the DAC is now fully operational. I had a look at the DIY club site and saw they also carry pcb's for tube preamps, looks pretty interesting, good prices too. But since I haven't heard of anyone else ordering there, I was wondering what your opinion is on doing business with them (I heard shipping from Asia can be a bit "erratic")?


Oemptempa petoempetapap
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
BB PCM 1702 vs 1704 A 8 Digital Line Level 34 5th February 2017 11:41 AM
PCM 1704 request vcelkamaja Digital Source 15 8th June 2006 07:48 AM
Pcm 1730 sound better than 1704 Ryssen Digital Source 2 8th December 2003 01:59 AM

New To Site? Need Help?

All times are GMT. The time now is 02:39 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2