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

Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

Reply
 
Thread Tools Search this Thread
Old 11th August 2010, 03:56 AM   #1961
flocchini is offline flocchini  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Davis,CA
Quote:
Originally Posted by Salas View Post
Where did you put a 470R instead of a 47R? On the base of the MJE?
470 ohm resistors were placed where the 47 ohm resistors should have been.
I just happened to check each resistor on the board when I replaced the 9610,MJE 350, and the 840. Was I surprised to read 470 instead of the 47 marked on the resistor. The resistors were grey IRCs

Works perfectly now

Thanks

Bob
  Reply With Quote
Old 11th August 2010, 04:05 AM   #1962
Salas is offline Salas  Greece
diyAudio Chief Moderator
 
Salas's Avatar
 
Join Date: Oct 2002
Location: Athens-Greece
OLD THREAD DAC End by Andrea Ciuffoli
It put it in very low Ib in the BJT error amp, cut out, and burst in oscillation too, probably. Should have got hot and collapsed. You can never be too careful with parts values. Good luck from now on, and watch high voltage. Always probe with one hand in the back pocket.
  Reply With Quote
Old 11th August 2010, 05:21 AM   #1963
flocchini is offline flocchini  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Davis,CA
Thank you Salas. I needed the reminder.
  Reply With Quote
Old 11th August 2010, 08:03 AM   #1964
pathetic is offline pathetic  Australia
diyAudio Member
 
Join Date: Sep 2006
Another diode question. Can't find any 1n4172. Is it a typo?

Also for the Salas for I/V stage....what should I buy for the 4A diode. Is the 2A/800V a 1n5819 or 1n5062? Thanks.
  Reply With Quote
Old 12th August 2010, 05:37 AM   #1965
quanghao is offline quanghao  Viet Nam
diyAudio Member
 
Join Date: Sep 2009
Location: Vietnam
Send a message via Yahoo to quanghao OLD THREAD DAC End by Andrea Ciuffoli
Quote:
Originally Posted by pathetic View Post
Another diode question. Can't find any 1n4172. Is it a typo?

Also for the Salas for I/V stage....what should I buy for the 4A diode. Is the 2A/800V a 1n5819 or 1n5062? Thanks.
1n5842 you can use Zenen diode 12V

Im sorry

1N5819 Schottky Barrier Rectifier .40V not 2A/800V

this DATA:
http://www.oup.com/us/pdf/microcircu...n5817-fair.pdf
__________________
The Best DAC is no DAC http://www.audiodesignguide.com/DSC2/index.html
ES9038PRO: http://quanghao.com/
  Reply With Quote
Old 13th August 2010, 03:39 AM   #1966
Strosek is offline Strosek  Canada
diyAudio Member
 
Join Date: Sep 2009
Quanghao, it seems that the first BOM had some mistakes and typos... Do you have an updated and corrected BOM?

I'm sure it would save a lot of questions and problems.

Thanks!
  Reply With Quote
Old 13th August 2010, 10:56 AM   #1967
klaju1955 is offline klaju1955  Brazil
diyAudio Member
 
Join Date: May 2007
Location: Brazil Recife
Quote:
Originally Posted by Strosek View Post
Quanghao, it seems that the first BOM had some mistakes and typos... Do you have an updated and corrected BOM?

I'm sure it would save a lot of questions and problems.

Thanks!
Hi all,

Im also wanted a updated list of the parts and the schematics of the last 2 PCB version.
Especially the power supply for I/V have changed.

You shows several typ of tubes for use:
6H6 B+ 270V
6H30 B+ 230V
6DJ6 B+ 200V
The power supply can regular 200V to 270V?

What is with the E182cc version with transformer, have news or schematics?

Klaus
  Reply With Quote
Old 13th August 2010, 03:08 PM   #1968
pathetic is offline pathetic  Australia
diyAudio Member
 
Join Date: Sep 2006
For anyone looking for oscon's, I've found a site that has the SP and its cheaper than Farnell. They'll be getting more stock sometime next week. Check them out Distributor of Display & Computer Products, Capacitors, ICs and Laser Diodes - Semicom Visual.
  Reply With Quote
Old 13th August 2010, 03:37 PM   #1969
Strosek is offline Strosek  Canada
diyAudio Member
 
Join Date: Sep 2009
I had also suggested that we start a new thread for builders of the most current DAC. When new posts are made it's always a pain trying to figure out which version of this project and boards the question is pertaining to.

Instead of this ALL IN ONE thread we should have a thread for each project ,add-on or new version of boards. The last thing we need is confusion when dealing with high voltages and high end parts.

Seems logical to me... anyone else?
  Reply With Quote
Old 13th August 2010, 10:28 PM   #1970
BudP is offline BudP  United States
diyAudio Member
 
BudP's Avatar
 
Join Date: Feb 2007
Location: upper left crust, united snakes
OLD THREAD DAC End by Andrea Ciuffoli
I know I am confused.

I have attached a PDF of the transformers that Gary has asked for, for the version he is building. I have also forwarded this to the four people who have asked to join in a group buy.

Bud
Attached Files
File Type: pdf Dac buffer amps group buy.pdf (11.4 KB, 157 views)
__________________
"You and I and every other thing are a dependent arising, empty of any inherent reality" Tsong Ko Pa
  Reply With Quote

Reply


OLD THREAD DAC End by Andrea CiuffoliHide 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
OLD THREAD Hi-end phono preamplifier by Andrea Ciuffoli quanghao Quanghao Audio Design 438 22nd September 2018 12:14 PM
Cleo: End to End 24bit 192khz USB DAC with tube output bcherry DIY HiFi Supply 7 4th July 2010 12:15 AM
The DAC End 2 by Andrea Ciuffoli pcb + most parts... prooptiki Swap Meet 7 31st May 2010 03:21 AM
Custom designed transformer for Andrea Ciuffoli 6c33c OTL AMP.... zxcxz Tubes / Valves 2 10th July 2009 05:14 PM
Andrea Ciuffoli Mosfet Amp DieterD Solid State 16 24th December 2001 06:56 AM


New To Site? Need Help?

All times are GMT. The time now is 12:31 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki