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Output transformers for DACs
Output transformers for DACs
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Old 28th May 2020, 03:26 PM   #421
potstip is offline potstip  Turkey
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Join Date: Oct 2013
Quote:
Originally Posted by kasbor View Post
Hi!
Why is the DCR so high for such a core and 80H inductance? May be 800H or 45 Ohm?

Thanks.
Hello Ivan are you using 100khz for measure and matching?
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Old 28th May 2020, 04:22 PM   #422
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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Join Date: Sep 2008
Location: Kazakhstan, Almaty
Output transformers for DACs
Quote:
Originally Posted by kasbor View Post
Hi!
Why is the DCR so high for such a core and 80H inductance?
Hi!
Depends on what transformer with do you trying to compare.

Quote:
Originally Posted by kasbor View Post
May be 800H or 45 Ohm? Thanks.
No, it was the correct data for that period of time: 450Ohm/80H @ 1kHz.
Such transformers was made for AK449x, where within its datasheet the Note regarding minimum resistance for output was given. Later, I decided not to adhere to these recommendations, since the transformer is connected without ground.
I want to attract your attention that usually for transformers on market the inductances are given at 50-100Hz as at higher frequency inductance can be few times less.
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Last edited by bisesik; 28th May 2020 at 04:35 PM.
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Old 28th May 2020, 04:23 PM   #423
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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Location: Kazakhstan, Almaty
Output transformers for DACs
Quote:
Originally Posted by potstip View Post
Hello Ivan are you using 100khz for measure and matching?
Hello. I do use 1kHz.
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Old 10th June 2020, 08:28 AM   #424
cbarth is offline cbarth  Norway
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Join Date: Aug 2012
Location: Arendal
Do you guys know of any sensible priced dacs using AK4499 or Sabre 9038Pro which would easily accomodate Ivan's transformers? Many dacs has really small enclosure which makes it a bit fiddly to mount...

My Roksan CDP had several issues, long story short we didnt get the transformers working properly, so next up is trying a dac.
If anybody is interrested in my transformers just pm me.
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Old 16th June 2020, 08:38 AM   #425
beardman is offline beardman  Denmark
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Location: a littlee town in western denmark
Muting from Ak4493 dac,,,

Can i use same muting with relay ,who let the output wire go to ground,,on the output on trafo from bisesik (i use RCA )

Best Bjarne
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Old 16th June 2020, 08:59 AM   #426
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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Join Date: Sep 2008
Location: Kazakhstan, Almaty
Output transformers for DACs
I believe you can do it.
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Old 16th June 2020, 09:07 AM   #427
beardman is offline beardman  Denmark
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Location: a littlee town in western denmark
just fine,,,so i will start to make a little construction to do this
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Old 21st June 2020, 01:31 PM   #428
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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Join Date: Sep 2008
Location: Kazakhstan, Almaty
Output transformers for DACs
Good day!
Dear friends, I hope that all current orders will be sent in early or mid-July. This weekend, for the first time, in several months, flights began to fly from my country abroad. The ability to send parcels by land exists now, but I find this method too long while, so I think it is better wait for air traffick. Thank you for understanding!
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Old 22nd June 2020, 10:42 AM   #429
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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Join Date: Sep 2008
Location: Kazakhstan, Almaty
Output transformers for DACs
UPDATE

Right now there are two ways to ship out transformers/boards from my country (due to pandemic restrictions):

a) by land transport via regular national post - (slow delivery through Lithuania) for this list of countries:
Austria
Belarus
Belgium
Bulgaria
China
Croatia
Czech Republic
Denmark
Estonia
Finland
France
Germany
Great Britain
Greece
Hungary
Ireland
Italy
Latvia
Liechtenstein
Lithuania
Luxembourg
Netherlands
Norway
Poland
Portugal
Russia
Romania
Slovakia
Slovenia
Spain
Sweden
Switzerland
Ukraine
Uzbekistan

b) by FedEx service. Approximate cost for FedEx delivery from 65 to 100$ depending on the country.

There is no FedEx office in my town, that is why shipment through FedEx is possible for me once a week.
Thanks.
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Old 25th June 2020, 11:48 AM   #430
bisesik is offline bisesik  Kazakhstan
Output transformers for DACs
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Join Date: Sep 2008
Location: Kazakhstan, Almaty
Output transformers for DACs
I have updated a little the design of bottom part in my transformers:

Pin 13 is replaced to internal m3 nut. M3 screw can be used for secure placement on the PCB. Plastic screw can be used if galvanical connection of the shileding is not needed. The safe maximum M3 screw length inside the transformer can be 6 mm.
All the pins are longer now for ~4mm and a bit thicker (was 1.96mm, 2.03mm now). Pin allocation remains the same.

pim_sec.jpg
2pim_2sec.jpg
Transformer_Drawing.jpg

zip-file: CAD, drawing and gerber files (PCB was made in Sprint LAyout 6, Circuit in Splan7)
25062020.ZIP


Another update. I have made another universal printed circuit board. Thanks too a banch of jumpers it is possible to use different number of primary and secondary coils, and various circuit connection are available: paralleled, in serial, diff\balanced, SE.

DSC_mill_max_0520_m3_2-4 coils.jpg
view.jpg
view_bot.jpg
top DSC_mill_max_0520_m3_2-4 coils and transformer_photo.jpg
bot DSC_mill_max_0520_m3_2-4 coils and transformer_photo.jpg
Attached Files
File Type: pdf 25062020.pdf (123.1 KB, 154 views)
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