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-   -   Output transformers for DACs (https://www.diyaudio.com/forums/vendor-s-bazaar/327794-output-transformers-dacs.html)

cbarth 20th January 2021 05:34 PM

Hi Ivan,

Have you made transformers for balanced to single ended use? I think that is a much better solution than just keeping pin 3 floating in a XLR to RCA adapter (or even worse; use an extra op-amp)

bisesik 20th January 2021 08:39 PM

Hi Christer,

Sure, no problem. 1+1:1 for example

roender 21st January 2021 07:19 PM

Servus,

What is the best traffo ratio for es9018 dac, se mode output, and how much will it cost for 2 pcs? There is a need for resistor on output of trafo?

Thanks,
Mihai

bisesik 21st January 2021 07:36 PM

Servus :confused:

Best transformers for ES9018S are 0.25+0.25+0.25+0.25:2+2 (6 coils version: 4 primaries : 2 secondaries). Cost for pair is $250. Some skill will be needed for connecting every output (each separate from 4 paralleled outputs) to separate primary coil. Cut of PCB traces, accurate thin wire soldering to thin traces on PCBs and so on...

Most suitable version is simple 1:8 for $170 for pair - regular connection of the Left (Right) (already galvanically parallelled) outputs to one primary coil.

I recommend to use FedEx service. Expensive (60-80 USD), but safe (in terms of time) and fast.

Thank you.
Ivan.

roender 26th January 2021 09:14 AM

Thank you for your answer.
Please allow me to ask you why is considered a better solution the individual connection of each output of the DAC compared to the parallel connection of the whole group before coupling to the primary of the transformer?
Is it mandatory to have a paralel resistor to the secondary winding and what value do you recomend ?

Kind regards,
Mihai

bisesik 26th January 2021 04:32 PM

Quote:

Originally Posted by roender (https://www.diyaudio.com/forums/vendor-s-bazaar/327794-output-transformers-dacs-post6504617.html#post6504617)
Please allow me to ask you why is considered a better solution the individual connection of each output of the DAC compared to the parallel connection of the whole group before coupling to the primary of the transformer?

Aurally/sonically.
Quote:

Is it mandatory to have a paralel resistor to the secondary winding and what value do you recomend ?
Yes, as the role of i/v conversion still relates to resistor. Value depends on the targeted voltage level. The higher resistor value - better for transformer itself (less damping). But the lower resistor value - better for DAC chip. So some balance should be achieved.
That i/v resistor is the output impedance at the same time.
From 1k to 4k, depending on the turns ratio as well.

Thanks.

angcl 25th February 2021 12:14 AM

anyone use Buffalo-IIIsePro-28 or 38 to connect to this output trans ? what load resistor is the best so far ? also , quality of resistor important ?

thanks

TioFrancotirador 1st March 2021 09:10 AM

Quote:

Originally Posted by angcl (https://www.diyaudio.com/forums/vendor-s-bazaar/327794-output-transformers-dacs-post6547642.html#post6547642)
anyone use Buffalo-IIIsePro-28 or 38 to connect to this output trans ? what load resistor is the best so far ? also , quality of resistor important ?

thanks

I did with es9038pro. I used 5k6 Naked Foil for RCA output. But it depends how much gain you need. I have high sensivity speakers 94db and no gain current amp Nelson Pass F4. It works perfect for my needs.

stew1234 4th March 2021 05:42 AM

I'm interested in this as well for balanced out of a es9038pro or 9028. Would you just change the resistor value to determine VRMS like with the other output stages? Did you mount the transformers or wire directly?


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