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Old 10th January 2010, 07:29 PM   #1
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Default Best I/V for multiple tda1541a, no tube no transformer

I plan to build a external dac with 2x or 4X or 8X TDA1541A.
The more I read the more I am confused about how the I/V stage effect the sound. And there is no specific I/V stage that is highly recommended.


I have my rotel rcd855 works very well with daul tda1541a, opa1611 opamp for I/V and output stage. Tried to put 4X tda1541a inside, but result is not good.

Need suggestion for the I/V and output stage for multiple TDA1541A.
Any working schematic ?
Please I perfer using no tube or transformer.

Last edited by fastvideo; 10th January 2010 at 07:37 PM.
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Old 11th January 2010, 09:46 PM   #2
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I like this schematic I/U for 1541 and others
it is dynamically linear I/U stage with feedback only in audio band 0-20kHz, but for multiple 1541 cap/res values should be converted.
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Old 13th January 2010, 01:39 PM   #3
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Quote:
Originally Posted by Nazar_lv View Post
I like this schematic I/U for 1541 and others
it is dynamically linear I/U stage with feedback only in audio band 0-20kHz, but for multiple 1541 cap/res values should be converted.
What is R5 for? how should I adjust it? for multiple 1541 which r/c should be convert?
Any circuit using opa861?
thanks.
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Old 14th January 2010, 03:17 PM   #4
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Quote:
What is R5 for?
nulling output
Quote:
for multiple 1541 which r/c should be convert?
R1,R2,C2,C3
write how many chips will you use, I recount it nominals
Quote:
Any circuit using opa861?
861 is worst, but not bad for 1955
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Old 14th January 2010, 03:27 PM   #5
Vikt0r is offline Vikt0r  Ukraine
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Quote:
Originally Posted by Nazar_lv View Post
I like this schematic I/U for 1541 and others
Surely you do love it

Nazar, if I have nothing better for I/U than THS3001 - how the schematic should look like?

BTW, the current source circuit (R5,R6,C4) for TDA1541 - what value is C4?

Thanks

Last edited by Vikt0r; 14th January 2010 at 03:41 PM. Reason: added question
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Old 14th January 2010, 03:35 PM   #6
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Quote:
Originally Posted by Nazar_lv View Post
R1,R2,C2,C3
write how many chips will you use, I recount it nominals
[/URL]
I have 10 spare tda1541 on hand.
Wanted to try with 2x or 4X or 8X TDA1541A to see how good multiple tda1541 can be?
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Old 14th January 2010, 03:55 PM   #7
Vikt0r is offline Vikt0r  Ukraine
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Quote:
Originally Posted by fastvideo View Post
Wanted to try with 2x or 4X or 8X TDA1541A to see how good multiple tda1541 can be?
Fastvideo,
your best solution would be the 2X design and selling (or gifting ) the rest to me, so I can try the 8X design

The more chips you use - the better the result would be. But not sure you will notice this difference
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Old 26th January 2010, 12:41 PM   #8
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Quote:
Originally Posted by Nazar_lv View Post
nulling output
R1,R2,C2,C3
write how many chips will you use, I recount it nominals
861 is worst, but not bad for 1955
Any update on this?
Any reason OPA861 is not good with TDA1541?
Any OPA861 working circuit with TDA1541? I have some OPA861 here and would like to test it out.
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Old 4th February 2010, 05:50 PM   #9
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fastvideo, sorry I have no time in January, for 2x 1541 R1=750 R2=2.2k C1=1500p C2=3900p
for 4x 1541 R1=390 R2=1.2k C1=3300p C2=7500p

Quote:
Nazar, if I have nothing better for I/U than THS3001 - how the schematic should look like?
see attach, schematic by Walt Jung

Quote:
BTW, the current source circuit (R5,R6,C4) for TDA1541 - what value is C4?
4.7-10u X7R 1206

Quote:
Any reason OPA861 is not good with TDA1541?
low power supply voltage, not super buffer
Attached Images
File Type: png Jung_IU_THS3001.PNG (73.0 KB, 1024 views)
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Last edited by Nazar_lv; 4th February 2010 at 05:53 PM.
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Old 5th February 2010, 07:44 AM   #10
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Quote:
Originally Posted by Nazar_lv View Post
see attach, schematic by Walt Jung
What's the reason to use the provided schematic, if the current of the DAC isn't fed into the low impedance of the CFA? The 1K in series destroys the idea, in this case why not use just a resistor for I/U? It just a workaround to avoid oscillation with a cap in a feedback loop (whic is otherwise not acceptable for CFA), but a workaround which screws the goodies of the CFA applicaton in here...

Last edited by Vikt0r; 5th February 2010 at 07:47 AM.
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