PCM1793 DIR9001 DAC worth it? - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

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
Reply
 
Thread Tools Search this Thread
Old 14th October 2012, 11:12 AM   #1
diyAudio Member
 
Join Date: Nov 2011
Default PCM1793 DIR9001 DAC worth it?

Hi
I would like to get this board as its cheap and simple. There is also schematic:

24-Bit 192KHz PCM1793 DAC with DIR9001 Receiver and OPA2134 OPAMP

Whats your opinion about it? What can be done to get even better SQ besides good external PSU and better opamp? Any thoughts are welocme.
Thanks.
  Reply With Quote
Old 14th October 2012, 03:28 PM   #2
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Blog Entries: 6
The DIR9001 is only capable of operation to 96kHz so the fact that the PCM1793 is capable of 192kHz operation is irrelevant. IMHO they are misrepresenting the maximum sample supported in their advertising.

Take a look at the Twisted Pear WM8804 spdif receiver and PCM1794A based COD which are capable of 192kHz operation. This also gives you a lot of flexibility to choose the I/V solution that suits your needs best. (I use tubes and transformers for I/V conversion.)

I've abandoned designs that use op-amps as in my opinion (NO FLAMES PLEASE) they do not deliver sonically. The OPA2134 is probably one of the better choices having said that.

Depends on budget I guess.
__________________
"Extraordinary claims require extraordinary evidence." - Carl Sagan
  Reply With Quote
Old 14th October 2012, 03:56 PM   #3
diyAudio Member
 
Join Date: Nov 2011
I dont care that much for 24/192 files, besides for this dac price is everything. I could always take I2S connection from PCM. Just asking if anyone have it/had it/played with it
  Reply With Quote
Old 14th October 2012, 05:12 PM   #4
diyAudio Member
 
Avro Arrow's Avatar
 
Join Date: Sep 2010
Location: Toronto, eh
I have had that DAC for a couple years now (I got it as a gift).
For what it is (and seeing as it was free) it sounds pretty good.
I use a pair of LME49990 in the filter/output stage.

The biggest design flaw is the Mono Amp chip being used as a rail splitter.
  Reply With Quote
Old 3rd February 2013, 11:04 AM   #5
405line is offline 405line  United Kingdom
diyAudio Member
 
Join Date: Mar 2011
Been using a heavily modified one of these for about 3 years and it sound good to me. I have bypassed, decoupled and "resevoir'ed"as much of it as possible and powered it with a couple of adjustable voltage regulators modules from a well known auction site (double regulated) based on an LT1764 reg chip and powered it from an old linear bench supply, the sound has blossomed from already good to magnificent (IMHO) used in conjuction with a hiface you will able to go to 176.4 khz (no sound output at 192 khz or higher). I was puzzled by this so I looked up the spec sheet for the receiver...I think I have found out how come it works at 176.4khz? "The PLL may also lock in outside of the specified sampling-frequency range, but extended range is not assured."

Sampling frequency range is 28 kHz to 108 kHz.
Maximum audio sample word length is 24-bit.
Note of others about the biphase input signal.
The capture ratio of the built-in PLL complies with level III of sampling frequency accuracy (12.5%), which is
specified in IEC60958-3.
The jitter tolerance of the DIR9001 complies with IEC60958-3.
The RXIN pin has a 5-V tolerant TTL-level input.

So if you want some thing made from unusually good basic parts, you can change the opa2134 for something better/different, and/or run the output chips (I use opa 627BP's) into class A you can end up with a really great sounding dac for little money.
  Reply With Quote

Reply


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
PCM1793 DAC - a bargain? Tolu Digital Line Level 19 18th August 2014 08:23 AM
PCM1793 DAC denny9167 Digital Line Level 0 13th February 2012 04:29 PM
Need help with tubed output for PCM1793 DAC kkillebrew Tubes / Valves 17 30th May 2011 03:36 AM
PCM1793 DAC chip dublin78 Digital Line Level 0 9th June 2009 08:32 AM
HELP!! pll1700+dir1703+pcm1793 DAC kafka Digital Source 12 28th September 2004 09:43 AM


New To Site? Need Help?

All times are GMT. The time now is 03:14 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2