Output transformers for DACs

[bisesik]

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

[Raj1]

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

[angcl]

Originally Posted by yunyun

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 .

[angcl]

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

[bisesik]

Originally Posted by Raj1

Hi bisesik,

Would it be possible to make a pair of transformers for the AKM4499, please?

Hi Raja.
Yes sure.

[bisesik]

Originally Posted by angcl

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...

[angcl]

Originally Posted by bisesik

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 .

[lemon]

Originally Posted by bisesik

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?

[bisesik]

Originally Posted by lemon

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

[angcl]

Originally Posted by angcl

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 ?