Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
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 April 2014, 01:15 PM   #1571
concept is offline concept  Singapore
diyAudio Member
 
Join Date: Jan 2014
Quote:
Originally Posted by leifchristensen View Post
DD: just one idea
the stacking of the boards makes cap and reg swapping extremely difficult
would it be possible to have som sort of stacking connectorsystem, e.g like the one used by TPA between the dac and the analog boards?they also use it between dac and AVCC reg board
they´re called pin headers and sockets for direct stacking and Mouser no. are 929647-04-36-I and 5-534237-1
These are only for two layers, but I guess other versions are available....
then one could simply plug the stack together and even pick it apart for swapping components or even just adding or subtracting no of boards
I hate the thought of desoldering, cleaning boards etc
best
Leif
Hi Leif, I have not actually check what pin headers you refering to but it's totally possible to stack the boards up with female pin headers for easy removal especially if you like to fool around or experiment like me and I have actually done just that.
A few pages back I did mention the stacking of dac chips and I am in still in the experimental stages of the idea so still not conclusive yet but so far so good. Still got many things to try so won't be able to say much for now.
Click the image to open in full size.
  Reply With Quote
Old 14th April 2014, 02:40 PM   #1572
leifchristensen is offline leifchristensen  Norway
diyAudio Member
 
Join Date: Dec 2005
Location: Norway
ok
yes the stackable socket should go through the hole with female up and male down or visa versa
best
Leif
  Reply With Quote
Old 14th April 2014, 02:58 PM   #1573
tubesguy is offline tubesguy  United States
diyAudio Member
 
Join Date: May 2002
Location: Madison, WI
Quote:
Originally Posted by palmito View Post
Search ebay for "Dupont Jumper Wire Cable Housing Female Pin Connector Terminal 2.54mm" for the connector and "Dupont Jumper Wire Cable Housing Female" for the plastic housing (ebay links don't work most of the time in the forum). You can get nicer, gold plated ones from Mouser/Digikey (i.e., molex), but for testing and short term use, these work ok. From ebay you can also get 10cm and sometimes 5cm "dupont arduino cables", which if you are happy with that length you can buy ready made.
Thanks, Frankie, for this tip. Might help with another project I have yet to finish. I immediately went on ebay and found some 30cm 2p to 2p that I can cut up to do just that.

Thanks also to Doede for continuing to support discussion of alternative ways to get information to his DAC, in this case from small embedded devices such as the rpi, and, more generally, from I2S sources. The more ways we can learn to skin the cat, the more fun we can have. (No cats were harmed, by the way, in the composing of this post.)
  Reply With Quote
Old 14th April 2014, 03:30 PM   #1574
concept is offline concept  Singapore
diyAudio Member
 
Join Date: Jan 2014
Quote:
Originally Posted by leifchristensen View Post
ok
yes the stackable socket should go through the hole with female up and male down or visa versa
best
Leif
Yes female side up and male side down.
  Reply With Quote
Old 14th April 2014, 08:46 PM   #1575
Supersurfer is offline Supersurfer  Netherlands
diyAudio Member
 
Join Date: Feb 2013
@Chahn, yes removing the plastic makes a difference. Plastic is static and because through a capacitor there is a dynamic AC current running, there will also be an electro magnetic field around it. This field will be influenced by plastic, and in turn this will influence rhe flow of current through the cap. So the difference you hear is very real!
That's also why I like my cinch cable more than any other cable with plastic cover.............

@Leif, you can cut out the pins of a DIL socket and solder them on the board, than solder short wires below the pin so they can be pushed into the underlying pin. In this way it will be a removable stack.

@bill, using the 32 shunts is very cool, would love to hear this.

Regards,
  Reply With Quote
Old 15th April 2014, 08:15 AM   #1576
stijn001 is offline stijn001  Netherlands
diyAudio Member
 
stijn001's Avatar
 
Join Date: Dec 2011
Quote:
Originally Posted by stijn001 View Post
How would you connect a passive volume control? What size pot should I use?

A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)
Does someone dare to comment on my question? I've come to realise I probably need a 100K pot and leave out the bleeding resistor.

However, I'm still unclear about which negative wiring scheme to use..

Any suggestions would be much appreaciated. I need to order parts hence I can not test this my self and are hoping someone here might have an insight.
  Reply With Quote
Old 15th April 2014, 09:54 AM   #1577
juancho is offline juancho  United Kingdom
diyAudio Member
 
Join Date: Apr 2005
Location: London, England
hi, from your diagram I would use Option 2-I do, with no bleeder resistors. I don't see why you need a 100k pot. Mine works perfectly into a 20k pot.
David
  Reply With Quote
Old 15th April 2014, 11:06 AM   #1578
stijn001 is offline stijn001  Netherlands
diyAudio Member
 
stijn001's Avatar
 
Join Date: Dec 2011
Quote:
Originally Posted by juancho View Post
hi, from your diagram I would use Option 2-I do, with no bleeder resistors. I don't see why you need a 100k pot. Mine works perfectly into a 20k pot.
David
Hi David, Thanks. Good to read someone has gone the same route. Can you confirm you’ve connected POS & NEG and not common like Doede specifies in his schematics? If the pot is 20K and you'd remove the bleeding resistor, your end up with 20k minimum bleeding resistance or am I missing something?
  Reply With Quote
Old 15th April 2014, 11:19 AM   #1579
juancho is offline juancho  United Kingdom
diyAudio Member
 
Join Date: Apr 2005
Location: London, England
Hi Yep, I confirm I use pos and neg out. The 20k pot will act as the bleed resistor and works fine with no switching thumps etc. Compared to using pos and common you get a higher output and possibly more dynamics. Incidentally I use without a capacitor too.
David
  Reply With Quote
Old 15th April 2014, 11:47 AM   #1580
dddac is offline dddac  Germany
diyAudio Member
 
Join Date: Jul 2003
Location: Wiesbaden
Quote:
Originally Posted by stijn001 View Post
Does someone dare to comment on my question? I've come to realise I probably need a 100K pot and leave out the bleeding resistor.

However, I'm still unclear about which negative wiring scheme to use..

Any suggestions would be much appreaciated. I need to order parts hence I can not test this my self and are hoping someone here might have an insight.
yes, option two is the one to pick IMHO
no bleeders needed....
__________________
www.dddac.com
Happy listening and building
  Reply With Quote

Reply


A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Audio Widget (modified) Async USB DAC 24/192 ESS 9023 headphone friendly ASIO KS 2A3SET Swap Meet 5 15th August 2012 04:52 AM
Show my PCM1794 DAC TSOLINK + COAX + USB input, Line and headphone AMP output AWaudio Vendor's Bazaar 3 2nd January 2012 12:44 PM
GodDAC - 192/24 USB DAC BizonGod Digital Source 36 30th June 2011 03:16 PM
24 bit/192 kHz via USB? gentlevoice Everything Else 3 22nd December 2008 06:24 AM


New To Site? Need Help?

All times are GMT. The time now is 02:53 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki