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Old 6th December 2003, 04:53 PM   #1
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Question tda1541a tubedac question

I am looking at this dac:
http://www.ndh.net/home/kboehm/T-DAC-P2.htm

the author says that the values of the filter section is calculated for usage without the 1:15 transformer.

If i would like to use the transformers and 75mH inductors what values is it that i should change?

the schematics can be found here:
schematics

/kasra
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Old 6th December 2003, 05:41 PM   #2
Bricolo is offline Bricolo  France
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I'm not sure about this, but:

with the transformer (depending on its bandwidth), you could even use no filter
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Old 6th December 2003, 09:51 PM   #3
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bricolo:
saying the filter, which components are we talking about?

/kasra
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Old 6th December 2003, 10:01 PM   #4
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Thorsten has a nice tube analog stage for TDA 1541 on his website... http://www.fortunecity.com/rivendell...da/vasfda.html

Bartek
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Old 6th December 2003, 10:06 PM   #5
Bricolo is offline Bricolo  France
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Quote:
Originally posted by kasra
bricolo:
saying the filter, which components are we talking about?

/kasra

the 2 chokes and the 3 paralleled caps.

But this has to be confirmed
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Old 6th December 2003, 10:15 PM   #6
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thank you for your repyls.

Im sitting on a bunch of telefunken &siemens e810f. Also i already got the 4 inductors and the tm3 that is the reason im looking at this specific design.

Anyone who can confirm bricolo?
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Old 6th December 2003, 11:50 PM   #7
dhaen is offline dhaen  Europe
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Klaus's DAC is based on Thorsten's Adagio design.
I think Klaus still has a vistors book. If you leave your question in there, maybe he'll get back to you.
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Old 7th December 2003, 01:28 PM   #8
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dhaen,

i have already emailed him without success

/kasra
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Old 7th December 2003, 02:05 PM   #9
dhaen is offline dhaen  Europe
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Hi Kasra,

Klaus did get back to me after a week or so.... That was back in summer. (N. Hemisphere )
I'm not sure that I understand your question exactly. I'm shortly going to be building Thorsten's Adagio
That uses the 1:1.15 transformers. You can see the filter values on his circuit.
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Old 8th December 2003, 12:45 PM   #10
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dhaen.

basically I am building a dac according to the schematics further up.

Klaus says on his site that the values on the schematics are adjusted for usage without the amplimo 1:15.

Since im going to use the 1:15 and the 75mH inductors. i need to know what components that should be changed in valueso i can use the transformer.


Anyone who even built this one?`

/kasra
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