Multichannel I/V stage for Buffalo III? - diyAudio
Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, 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 30th January 2013, 06:46 AM   #1
Crumboo is offline Crumboo  Sweden
diyAudio Member
 
Join Date: Dec 2007
Default Multichannel I/V stage for Buffalo III?

Hi,

I'm looking for a 8 ch I/V stage for use with my Buffalo III dac that I'm putting together. Are there any available options for this? All I/V-stages I've found so far are mono or stereo only. Of course it is possible to use several of them, but maybe there is a neater, not to expensive, solution? Only balanced outputs are required, so no BAL/SE conversion is needed.

Best regards,

Mattias
  Reply With Quote
Old 30th January 2013, 07:42 AM   #2
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
nope, you will have to make your own i'm afraid, but it will basically just be 4 x 2 channel IVs tied together, because thats what it is, there is no short cut if you want an active solution. you will have to take into account the 4 x lower current available per channel, for your choice of IV resistors and filter values.
  Reply With Quote
Old 30th January 2013, 08:08 AM   #3
knuisje is offline knuisje  Netherlands
diyAudio Member
 
Join Date: Apr 2007
I developed an ES9016 based dac with 2 I/V converters onboard. I have an expansion board available for 6 additional I/V converters that can be stacked onto the dac board.

At the pictures you can also see the supply and controller boards.
Attached Images
File Type: jpg Overview.JPG (432.8 KB, 406 views)
File Type: jpg Multichannelpcb.JPG (427.5 KB, 398 views)
File Type: jpg Display.JPG (84.0 KB, 385 views)
  Reply With Quote
Old 30th January 2013, 02:49 PM   #4
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
well there you go...

how do you find the 9016? seems just 9018 without external DVDD. seems to just be the same die. do you have much experience with 9018 to compare? the reason I ask is I have started planning my own 9016 board for my subs, as well as a small multichannel to play with. i'm running 2 x 9012 dacs for 2 ways with discrete SS IV stages, but wanted to do something a bit less involved for the subs
  Reply With Quote
Old 30th January 2013, 04:53 PM   #5
knuisje is offline knuisje  Netherlands
diyAudio Member
 
Join Date: Apr 2007
I haven't heard the 9018 but the 9016 sounds excellent. About 10 of these dacs are built by members of a Dutch diy forum with very positive feedback. And as you say the dies are probably identical.
  Reply With Quote
Old 30th January 2013, 06:54 PM   #6
diyAudio Member
 
georgehifi's Avatar
 
Join Date: Sep 2003
Location: Manly Australia (Jewel of the Pacific)
Send a message via MSN to georgehifi
Why not use 8 of these, with or without the built in buffer.
Using the AD844 as an I/V

Cheers George
__________________
Avatar : Production Lightspeed Attenuator
www.lightspeedattenuator.com
  Reply With Quote
Old 30th January 2013, 07:15 PM   #7
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by georgehifi View Post
Why not use 8 of these, with or without the built in buffer.
Using the AD844 as an I/V

Cheers George
because he needs 8 x balanced; 16 of them is a touch OTT
  Reply With Quote
Old 30th January 2013, 08:28 PM   #8
Crumboo is offline Crumboo  Sweden
diyAudio Member
 
Join Date: Dec 2007
Quote:
Originally Posted by knuisje View Post
I developed an ES9016 based dac with 2 I/V converters onboard. I have an expansion board available for 6 additional I/V converters that can be stacked onto the dac board.

At the pictures you can also see the supply and controller boards.

Wow, that looks like something I was looking for; thank you. I don't know about the difference between ES9016 and ES9018 either, but do you think that board would work with Buffalo III? Are the connections to the DAC lined up accordingly?

Otherwise; can you share a schematic of the board and BOM so I can do an own PCB layout based on your work?
  Reply With Quote
Old 30th January 2013, 08:44 PM   #9
knuisje is offline knuisje  Netherlands
diyAudio Member
 
Join Date: Apr 2007
The layout of the expansion board is specifically designed for my dac board and doesn't fit the connections of the buffalo dac. Have a look at the TPA IVY-III for an I/V schematic you can use for the buffalo dac.
  Reply With Quote
Old 31st January 2013, 04:55 AM   #10
qusp is offline qusp  Australia
diyAudio Member
 
qusp's Avatar
 
Join Date: Oct 2009
Location: Brisbane, Australia
Quote:
Originally Posted by Crumboo View Post
Wow, that looks like something I was looking for; thank you. I don't know about the difference between ES9016 and ES9018 either, but do you think that board would work with Buffalo III? Are the connections to the DAC lined up accordingly?

Otherwise; can you share a schematic of the board and BOM so I can do an own PCB layout based on your work?
I do know the difference objectively, I have the datasheets for both and have been playing with 9012/9018 for years. the output SNR, DNR and THD are lower, roughly 10-15db vs the premium parts, but as far as I can see, this is only created by less pins being brought out and thus more voltages generated internally from other voltages, maybe a slightly different process and smaller die perhaps. but otherwise the part is identical, firmware for 9018/12 should even work with minimal changes if any. operating points, supply voltages, digital filters, MUX, voltage and current on the outputs and operating points are all identical. thats why I think its just the same part, perhaps less discriminating internal element matching as well as the other stuff above brought the lower, nbut still pretty stellar performance.

the board above is a standard opamp based IV, nothing tricky there, look for the es9008 application note, there is a multichannel schematic and good layout recommendations/application note. again it should be able to be applied with decent results.
  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
Buffalo III - SE Russ White Twisted Pear 415 25th May 2014 06:09 PM
Buffalo III Simple Output Stage Help? davecandialex Digital Line Level 3 23rd December 2012 04:04 PM
looking for a Buffalo III Dac Spodin Swap Meet 0 26th October 2012 09:07 AM
Dual I/V stage implementation for Buffalo II & III pinnocchio Analog Line Level 19 16th October 2011 01:18 AM


New To Site? Need Help?

All times are GMT. The time now is 05:53 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