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 8th July 2005, 11:51 AM   #1
dillo is offline dillo  Italy
diyAudio Member
 
dillo's Avatar
 
Join Date: Jun 2005
Location: near Milan
Default phantom pcm 1732

Hello to everybody,
I have a NAD c542 which uses a Burr Brown pcm 1732 dac.
On the Texas Instruments site I could not find any info on this chip.
Does anybody have a data sheet of this *secret* chip, or does anybody know if it has any other name or reference?

Thank you very much.
  Reply With Quote
Old 8th July 2005, 12:32 PM   #2
macboy is offline macboy  Canada
diyAudio Member
 
Join Date: Oct 2003
Location: Ottawa, Canada
Try google. It's out there.
  Reply With Quote
Old 8th July 2005, 01:37 PM   #3
richt is offline richt  Puerto Rico
diyAudio Member
 
Join Date: Nov 2001
Location: puerto rico
hi

pcm1710,1716, & 1732 are almost electrical identical on info datasheet
(schematic).

nad c541 is a beatuifull unit to heavily mod and surpasses much more expensive units!!!

the clock is located on the dac not on the servo! so start replacing the clock with a good one 16.9344megs,eliminate the 2 transistor output mutes near the rca outs (that prevents thumps when powering & off) it can be replaced with an relay.

these 2 small tweaks will perform a way lot better than you can imagine.

later start changing caps.

good luck!
richt
  Reply With Quote
Old 8th July 2005, 06:27 PM   #4
Franz G is offline Franz G  Switzerland
diyAudio Member
 
Franz G's Avatar
 
Join Date: Jun 2004
Location: Bern / Switzerland
A good source for datasheets:

http://www.alldatasheet.com/

Including PCM1732.

There are several good mods available for the PCM1732 on the net.

One of the easiest is the "Swanson" mod: direct output from the DAC with good coupling caps and a 100R resistor in series to the output.

Disadvantage: lower power level.

Happy ears!
Franz
  Reply With Quote
Old 11th July 2005, 05:37 PM   #5
dillo is offline dillo  Italy
diyAudio Member
 
dillo's Avatar
 
Join Date: Jun 2005
Location: near Milan
Thank you very much guys!
I found the datasheet, but I still wonder why Texas Instrument hides it. There are a lot of very good machines out there running this chip and they have an outstanding reputation! Furthermore HDCD is to me a very good technology, even if it is not very popular.
I think I am going to bite off those nasty muting transistor and maybe substitute them with relays. Any advice? (please) Are thei useful only when powering up the cd player with the amp on, or they serve also when the cd player enters/exits stanby mode? ( or play/stop?)
Richt, what do you mean that the clock is not on the servo? there is a clock (at least a crystal) on the main board.. It should syncronize both the transport and the dac, or am I wrong?
Sould I do any special to install a better one (e.g. LC XO, etc)?
Would you recommend one in particular?
Franz G, thank you very much, you built some appetite in my curiosity... but I think you've gone too far for my ability and understanding of the matter.
Maybe I will post you in the future, when I'll have more confidence with these issues

Bye and have a very good time!
  Reply With Quote
Old 12th July 2005, 08:24 AM   #6
diyAudio Member
 
mpopovics's Avatar
 
Join Date: Apr 2002
Location: Hungary
Default PCM1732

24-Bit, 96kHz, Stereo Audio DIGITAL-TO-ANALOG CONVERTER With HDCD Decoder

This is the only DAC from BB, which includes the HDCD decoder.
This is not for commercial market, only OEMs can buy those chips.
There are several licensing rules applies (AFAIK, the HDCD technology and all licenses related to it owned by Microsoft now...).
That is why you can not find in product range and can not buy it.
  Reply With Quote
Old 13th July 2005, 11:44 AM   #7
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
I have the PCM1738e in my Musical Fidelity A3.24, but it does'nt have HDCD, it' a 24/96 or 24/192 switchable. Below is 1/2 of the circuit as my scaner can only do A4 and it's A3. I'll do the other 1/2 in another post.

Cheers George
Attached Images
File Type: gif brother scan.gif (78.2 KB, 1316 views)
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 13th July 2005, 12:07 PM   #8
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
Input half
Attached Images
File Type: gif brother scan3.gif (95.3 KB, 1118 views)
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 13th July 2005, 12:12 PM   #9
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
Power Supply
Attached Images
File Type: gif brother4.gif (59.1 KB, 1038 views)
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 14th December 2005, 08:42 PM   #10
diyAudio Member
 
ozone_stink's Avatar
 
Join Date: Jan 2005
Location: Montreal
Franz, I've Googled PCM1732 & mod and most of them concern the Swanson mod you speak of.

Would you be so kind as to point me in the direction of other mods or give me an abstract of what they are?

Thank you for your help!!
  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
+/-15V from +48V Phantom Pilbromatic Parts 4 9th August 2009 05:46 AM
pcm 1732 current out or voltage out type? tubo Digital Source 2 12th April 2008 10:25 PM
48v phantom / resistor is way hot ! redrabbit Solid State 12 15th February 2006 08:14 AM
Using the phantom power Gabevee Instruments and Amps 2 29th July 2005 05:32 AM
phantom powering non-phantom mics karambos Instruments and Amps 8 3rd January 2004 09:21 AM


New To Site? Need Help?

All times are GMT. The time now is 10:51 PM.


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