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Old 13th December 2003, 09:07 PM   #1
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Default E810F filter buffert in dac Q

I am looking at this dac:
Tubedac tda1541a

the author says:
The values of the filter section is calculated for the version without Transformers.

I want to build this dac using the 1:15 transformers and 2x75mH inductors.

Can anyone helo me pointing out which components belongs to the so called "filter" and what values should i try change them to?

the schematics can be found here:schematics

/kasra
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Old 13th December 2003, 10:29 PM   #2
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Hi,

Not sure what exactly it is you want to do.

While I can point out the filter components, I'm at a loss as to where the 75mH chokes come from?


Did you post the wrong URL for the second link?

Cheers,
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Old 14th December 2003, 09:46 AM   #3
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fdegrove:
Thank you for the reply.

I once had contact with the authour/designer, he said that using 1:15 transformer, one had to change the 3.3mH inductors to 75mH. And recalculate the filter.

The second URL is just a bigger picture of the schematics. of the version without 1:15 transformer. (eventhough its there on the schematics, bypassed?)

He also has a version one of this dac using e182cc instead of e810f, on that schematics he uses the 1:15 and 75mH.
with e182cc

/kasra
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Old 14th December 2003, 12:03 PM   #4
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Hi,

So you want to use the Version 1 filter in combination with the Version 2 E810F tube?

As Version 1 uses the 1:15 ratio xformer you can use the same filter:

Cheers,
Attached Images
File Type: gif dac_filter.gif (3.2 KB, 220 views)
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Old 14th December 2003, 03:01 PM   #5
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fdegrove:

thank´s alot!
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