DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 159 - 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 11th April 2012, 04:46 PM   #1581
TheGimp is offline TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
I have a general question about these DAC boards as I am considering purchasing one to play with.

Several vendors show what are supposed to be FFTs and frequency response plots of the DACs in operation.

The attachment is typical of the frequency response plots I see.

Note the response for 44.1KHz and 48KHz sample rates go beyond 40KHz for the -3dB point! Kind of a neat converter to get around Nyquest.

Can any of the data seen be trusted?

In particular I am interested in the CS8416 plus CS4398 boards and as questionable as the plots are I'm wondering how good they really are.

Thanks.
Attached Images
File Type: jpg DAC_FR_fr_EBAY.JPG (46.4 KB, 555 views)
  Reply With Quote
Old 11th April 2012, 07:02 PM   #1582
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by Sergelisses View Post
I would like to check your Shunt reg on the AK4396 5v Ana ,i have a question about the BD 139 .
Can i replace it by an equivalent smaler ?
Hi Serge,

if you mean physical smaller the direct equivalent is BC639 (better the -16 version).

BTW any bipolar with hfe > 120 and power ratings >625mW should do .
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 11th April 2012, 07:10 PM   #1583
hotiron is offline hotiron  Scotland
diyAudio Member
 
hotiron's Avatar
 
Join Date: Feb 2007
Location: Aberdeen Scotland
Quote:
Originally Posted by billo44 View Post
I seem to have a dead DAC on my hands....
Power, 96k, error lights come on, 96K goes off when SPDIF is plugged in, error light flickers when the CD is spooling up and goes out when the CD plays.
just no sounds...
Transformer voltages are OK.
I swapped the op-amp for the original, it being the only thing which is socketed, but same results as expected.

My principle DAC one of Peter Daniels NOS DAC (I love it) works in the same slot with all the same cabling (all other thing equal).

Can any one spot anything stupid?
Do those symptoms mean anything to anyone? (Apart from 'it's fu--ed'!)

Bill
Remove the green/yellow (screen) from the phono outputs then wire the spare green and black wires together on the 9 volt input .eg: black with black and green with green. The voltages should be higher than you show 8.5v ac 9.5v DC these should be higher, wiring the two windings together will give you more current.
__________________
If you give up easily Dont start!!
  Reply With Quote
Old 11th April 2012, 07:24 PM   #1584
TheGimp is offline TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
Quote:
Originally Posted by merlin2069er View Post
Here's an unbalancer using miniature 6n16b tubes.... the blog is in italian (but you can use google to translate it into english.

Valvole & Audio: UNBALANCER Project

Does anyone know where I can get a spice simulator for tubes?
LTSpice from Linear Technology. It is free, and there is considerable on line support.
  Reply With Quote
Old 12th April 2012, 02:40 AM   #1585
billo44 is offline billo44  United Kingdom
diyAudio Member
 
billo44's Avatar
 
Join Date: Sep 2009
Location: Nagano Japan
Quote:
Originally Posted by hotiron View Post
Remove the green/yellow (screen) from the phono outputs then wire the spare green and black wires together on the 9 volt input .eg: black with black and green with green. The voltages should be higher than you show 8.5v ac 9.5v DC these should be higher, wiring the two windings together will give you more current.
Thanks I'll try that later. I did try removing the earth/ground/screen from the phono outputs, I keep trying everytime I change something else.
OK on the bench but in the final config. I think phono earth should be earthed.

More later...

Thanks
Bill
  Reply With Quote
Old 12th April 2012, 07:06 AM   #1586
diyAudio Member
 
Join Date: Nov 2003
Location: Near PARIS
Quote:
Originally Posted by ClaveFremen View Post
Hi Serge,

if you mean physical smaller the direct equivalent is BC639 (better the -16 version).

BTW any bipolar with hfe > 120 and power ratings >625mW should do .
Thanks Dario

Serge
  Reply With Quote
Old 12th April 2012, 07:19 AM   #1587
diyAudio Member
 
Join Date: Feb 2010
Quote:
Originally Posted by ClaveFremen View Post
Hi Serge,

if you mean physical smaller the direct equivalent is BC639 (better the -16 version).

BTW any bipolar with hfe > 120 and power ratings >625mW should do .
hey Dario, can we see some pictures of your DAC after the shunt regs mod?

it just seems with all that components, it seems a little pushing it to mount them all on the board
  Reply With Quote
Old 12th April 2012, 07:31 AM   #1588
hotiron is offline hotiron  Scotland
diyAudio Member
 
hotiron's Avatar
 
Join Date: Feb 2007
Location: Aberdeen Scotland
Bill,Grounding the phonos are guaranteed to give you ground loops.The phonos are tied to 0 volts on the board.
__________________
If you give up easily Dont start!!
  Reply With Quote
Old 12th April 2012, 09:59 AM   #1589
50AE is offline 50AE  Bulgaria
diyAudio Member
 
Join Date: Jul 2011
Location: Sofia, Bulgaria
I turned it on today!

Usually I'm always pessimistic when it comes to the first listen of any of my devices - I always expect them to sound bad. So I plugged the S/PDIF, turned it on, played music and

WOW! I had one of these moments staying with the mouth open for minutes. Played song after song, this thing sounds so great. At thirst, there was a tiny weirdness in the sound, but it seemed to get away with time, maybe burning in. My face went in tears when I played Three Wishes by Roger Waters, never heard it sound this way.

So here's a "resume" of the description of my DAC

-6Н1П input tubes (3mА -1,5V)
-6Н6П output (15mА -2,5V)
-interstage coupling К40-У9 PIO russian caps without the metal casing
-output coupling ЕТО-3 AgTa wet miltary grade russian caps
-Tesla resistors, and carbon composite
-PSU: Cf LC LC LC RC Cf=50uF L=5H, C=4uF, R =1k
-pine chassis with shellac coating
-Salas shunt reg for the analog DAC part
-separate cables for DAC PSU, heater PSU and B+
-option to turn the heater before the B+

Things to do:
-stabilization of first stage B+ using voltage stabilizers OA2
-USB->I2S board inside close to the DAC board. The DAC will become USB compatible.
-Another Salas shunt for the I2S PSU
-Removing the electrolyte cap from the PSU and making it electrolyteless.
  Reply With Quote
Old 12th April 2012, 10:30 AM   #1590
billo44 is offline billo44  United Kingdom
diyAudio Member
 
billo44's Avatar
 
Join Date: Sep 2009
Location: Nagano Japan
Quote:
Originally Posted by hotiron View Post
Remove the green/yellow (screen) from the phono outputs then wire the spare green and black wires together on the 9 volt input .eg: black with black and green with green. The voltages should be higher than you show 8.5v ac 9.5v DC these should be higher, wiring the two windings together will give you more current.
Well... I tried that and the transformer physically buzzes horribly!
even after unplugging signal input and output
Also no LED's on teh board light up.

I won't hazard any guesses because I am a 'join the dots' player in this forum.
Hoping my mistakes may help others to avoid them...

Is that a yellow Ducati in your Avatar Hotiron? Picture is too small so I can't ID the bike.

OK, so I was lying... I speculate...maybe I have a duff transformer (or I fried the transformer)?
Where can I find out all about testing transformer health in a jiffy?

Best regards,
Bill

Last edited by billo44; 12th April 2012 at 10:35 AM.
  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
AK4393 burn... CIMONE Digital Line Level 5 24th June 2011 02:12 PM
AK4393 to CS4223? CIMONE Digital Line Level 0 13th December 2009 02:30 PM
AK4393 Serial Configuration Problem Aoxomox Digital Line Level 0 20th March 2009 05:25 PM
AK4393, CS8413 and CS8414 Data Sheets Blue_Max Digital Source 0 23rd December 2004 01:37 PM


New To Site? Need Help?

All times are GMT. The time now is 01:02 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