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

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Old 16th August 2010, 10:57 AM   #1981
klaju1955 is offline klaju1955  Brazil
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Quote:
Originally Posted by quanghao View Post
Hi Strosek!
What is wrong the Bom of DAC and IV stage?? Can you show me please??
Thanks
Hi Quang Hao,

in the last version (2 PCB) you have changed the SSHV for the I/V stage, itīs the same of the D3a Pre.
There are lot of changes during the thread, I am a little unshure what I have to buy.
Also the dimension of the power transformer is for me ??????, after Tangmonster have had a lot of problems with the PS of the D3a Pre.
You show different tubes for use, but the need also different B+, 200V - 270V, the SSHV can regulate it without changing nothing of parts?
Perhaps Salas can give a little help here.
I think it would be a good idea show a new atual BOM and schematics with all values verified.

Klaus
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Old 16th August 2010, 12:12 PM   #1982
Strosek is offline Strosek  Canada
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Quote:
Originally Posted by quanghao View Post
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
Quanghao... Here is one...

PLEASE NEW THREAD AND NEW BOM

It's very confusing having differrent projects all in one thread. Threads are free! It makes sense! Let's do it already!
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Old 16th August 2010, 12:30 PM   #1983
Strosek is offline Strosek  Canada
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Quanghao, you have a great project here and I'm not trying to be difficult... I'm only asking that you start a new thread because this thread is getting confusing with all the different interations of this project all being discussed in one place. I don't think I'm the only one asking for this either.
As far as typos in the BOM just look back a few pages.



Thanks!
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Old 16th August 2010, 12:44 PM   #1984
quanghao is offline quanghao  Viet Nam
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Strosek!
Thank you!
it is a very good idea, but I find it!
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Old 16th August 2010, 12:54 PM   #1985
quanghao is offline quanghao  Viet Nam
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Hi all!
I have open new topic about DAC-END 2 up dat, I call DAC-ASH , it mean Andrea-Salas-Quanghao
You see in this link: http://www.diyaudio.com/forums/quang...ml#post2274329

The comments of you is what I always look forward and thank you immensely.
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Old 16th August 2010, 02:18 PM   #1986
flocchini is offline flocchini  United States
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Originally Posted by quanghao View Post
Hi Strosek!
What is wrong the Bom of DAC and IV stage?? Can you show me please??
Thanks
Quanghao:

In post 1785 for Salas HV IC1 is listed as a 9160. I believe it should be a IRF9610.

Also for the zener (4172) you have recommended other options as this number is hard to find.

My SalasHV is running well powering my E182CC board

Best

Bob
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Old 18th September 2010, 04:30 PM   #1987
Dear77 is offline Dear77  Poland
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Hi Guys,
Ive a question- has it ever happened to any of you that one of the dac elements close to AD1865 gathered 50 Hz transformer noise that was audible in the speakers? i know that my transformer is too close to the pcbs but the guy i bought it from assured me its screened. When I put in optional chokes, its even a bigger nightmare- noise is audible at 9 oclock. Its less noisy when I put in a piece of steal between the transformer and pcb where the chokes and wires joining pcbs are. Thx for help
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Old 18th September 2010, 05:06 PM   #1988
BudP is offline BudP  United States
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If your transformer is a nickle core device, you will have to take some extraordinary measures to overcome hum, regardless of screening. The core is a great antenna.

Separate .060 thick cold rolled steel box, annealed to Marstenite / Osteonite temperatures will buy you -120 db of external field rejection. Nickel and copper plate will extend that off into RF land.

Buy Ralph Morrisons book "Grounding and Shielding Techniques" to learn how to implement fully shielded boxes.

Of course, you could also start turning the transformer, rotating it in three axis and raising and lowering, to see if there is a null field plane you can use. Alternately begin changing the location of AC carrying wires with relation to the transformer.

Thing to know and use about EMF is that it is an infinite field, but you can shove it and form it by using ferrous materials with little permeability, as in the CRS above, or mu metal for high perm attachment . Think in 3D above all.
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Old 29th October 2010, 09:14 AM   #1989
COX77 is offline COX77  France
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It is a long time and j have never received my boards
Philippe
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Old 6th November 2010, 04:13 PM   #1990
quanghao is offline quanghao  Viet Nam
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[QUOTE=flocchini;2274391]Quanghao:

In post 1785 for Salas HV IC1 is listed as a 9160. I believe it should be a IRF9610.
Im sorry im wrong!
It is IRF9610

Also for the zener (4172) you have recommended other options as this number is hard to find.

Im sorry im wrong!
And Zenner 4742 , Zener 12V

My SalasHV is running well powering my E182CC board

It is good!
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