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Output transformers for DACs
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Old 30th June 2020, 08:29 AM   #431
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.
Another step-up version of transformer have been developed.
Turns ratio: 1:6+6+6 (1:6 or 1:12 or 1:18)
Frequency response (source 40 ohm, 10 K ohm load, 1:18):
-3dB points: 2Hz & 115kHz
-1dB points: 3Hz & 75kHz

Application: impedance matching for moving coil phono cartridges
Price: $205 for pair
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Last edited by bisesik; 30th June 2020 at 08:47 AM.
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Old 1st July 2020, 09:47 PM   #432
Raj1 is offline Raj1  United Kingdom
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Location: UK
Hi bisesik,

Would it be possible to make a pair of transformers for the AKM4499, please? Depending on possibilities, I may use it to drive this circuit:

http://itsonlyaudio.com/ultranalog/c...ancer2_3a5.pdf

-Raja
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Old 2nd July 2020, 05:19 AM   #433
angcl is offline angcl  Singapore
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Join Date: Aug 2005
Quote:
Originally Posted by yunyun View Post
I mean an IV PCB that can be used with the Buffalo-IIIsePro38, such as the PCB designed by Ian.

Attachment 794445

Attachment 794446

In fact, you only need to follow Ian's design to increase your transformer installation position. It can be applied to both Buffalo and Ian's DAC. You don't need to design two boards.
how to buy this board ? I am keen .
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Old 2nd July 2020, 06:23 AM   #434
angcl is offline angcl  Singapore
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Join Date: Aug 2005
Hi bisesik,

I need a output trans for my Twisted Pear Audio ,Buffalo-IIIse Pro ES9038,

what is the price now ? what is the shipping cost to Singapore ?

thanks
With regards
Angcl
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Old 2nd July 2020, 07:34 AM   #435
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 Raj1 View Post
Hi bisesik,

Would it be possible to make a pair of transformers for the AKM4499, please?
Hi Raja.
Yes sure.
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Old 2nd July 2020, 08:31 AM   #436
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 angcl View Post
Hi bisesik,

I need a output trans for my Twisted Pear Audio ,Buffalo-IIIse Pro ES9038,

what is the price now ? what is the shipping cost to Singapore ?

thanks
With regards
Angcl
Hi Angcl,
Price for finished i/v board (like showned here Output transformers for DACs )
is $240.

Regarding shipping to Singapore. As I posted previously unfortunatelly there is still no airmail-service within my national post company and many directions are closed due to flights absence. That is why the one only possible way to send it to you right now is via courier-post like FedEx\DHL\UPS. Prices are quite high unfortunatelly ~$100. I am still in the process of finding another more accessible shipment way...
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Old 3rd July 2020, 12:40 AM   #437
angcl is offline angcl  Singapore
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Join Date: Aug 2005
Quote:
Originally Posted by bisesik View Post
Hi Angcl,
Price for finished i/v board (like showned here Output transformers for DACs )
is $240.

Regarding shipping to Singapore. As I posted previously unfortunatelly there is still no airmail-service within my national post company and many directions are closed due to flights absence. That is why the one only possible way to send it to you right now is via courier-post like FedEx\DHL\UPS. Prices are quite high unfortunatelly ~$100. I am still in the process of finding another more accessible shipment way...
I thinks I just want the trans, no need the PCB to save cost , this is for twisted Twisted Pear Audio ,Buffalo-IIIse .
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Old 3rd July 2020, 06:54 AM   #438
lemon is offline lemon  Greece
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Join Date: Apr 2009
Quote:
Originally Posted by bisesik View Post
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.
...
zip-file: CAD, drawing and gerber files (PCB was made in Sprint LAyout 6, Circuit in Splan7)
...

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.

...
Nice upgrade, bisesik!
Very useful pdf schematics.
The female pins accepting are the same as before or they are differente?
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Old 3rd July 2020, 09:35 AM   #439
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 lemon View Post
Nice upgrade, bisesik!
Very useful pdf schematics.
The female pins accepting are the same as before or they are differente?
Thank you!

Sure, forgot about pinout:
pin allocation.jpg
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Old 6th July 2020, 09:57 AM   #440
angcl is offline angcl  Singapore
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Join Date: Aug 2005
Quote:
Originally Posted by angcl View Post
I thinks I just want the trans, no need the PCB to save cost , this is for twisted Twisted Pear Audio ,Buffalo-IIIse .
any update ?
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