tda1541a tubedac question

kasra · 6th December 2003, 05:53 PM

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

Bricolo · 6th December 2003, 06:41 PM

I'm not sure about this, but:

with the transformer (depending on its bandwidth), you could even use no filter

kasra · 6th December 2003, 10:51 PM

bricolo:
saying the filter, which components are we talking about?

/kasra

zygibajt · 6th December 2003, 11:01 PM

Thorsten has a nice tube analog stage for TDA 1541 on his website... http://www.fortunecity.com/rivendell...da/vasfda.html

Bartek

Bricolo · 6th December 2003, 11:06 PM

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

kasra · 6th December 2003, 11:15 PM

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?

dhaen · 7th December 2003, 12:50 AM

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.

kasra · 7th December 2003, 02:28 PM

dhaen,

i have already emailed him without success

/kasra

dhaen · 7th December 2003, 03:05 PM

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.

kasra · 8th December 2003, 01:45 PM

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

6th December 2003, 05:53 PM	#1
kasra diyAudio Member Join Date: Nov 2001 Location: Sweden	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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6th December 2003, 06:41 PM	#2
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	I'm not sure about this, but: with the transformer (depending on its bandwidth), you could even use no filter

6th December 2003, 10:51 PM	#3
kasra diyAudio Member Join Date: Nov 2001 Location: Sweden	bricolo: saying the filter, which components are we talking about? /kasra

6th December 2003, 11:01 PM	#4
zygibajt diyAudio Member Join Date: Jun 2003 Location: Wroclaw	Thorsten has a nice tube analog stage for TDA 1541 on his website... http://www.fortunecity.com/rivendell...da/vasfda.html Bartek

6th December 2003, 11:15 PM	#6
kasra diyAudio Member Join Date: Nov 2001 Location: Sweden	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?

7th December 2003, 12:50 AM	#7
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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.

7th December 2003, 02:28 PM	#8
kasra diyAudio Member Join Date: Nov 2001 Location: Sweden	dhaen, i have already emailed him without success /kasra

7th December 2003, 03:05 PM	#9
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	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.

8th December 2003, 01:45 PM	#10
kasra diyAudio Member Join Date: Nov 2001 Location: Sweden	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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