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Old 9th November 2007, 12:45 PM   #1
JC951t is offline JC951t  Taiwan
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Default Best regulated power supply.

Hi Guys,
With all the interest in Nos, I was wondering
if anyone could share their experiences as to
which regulator design is best suited for the
TDA 1541 in terms of sound quality.

Thank you
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Old 11th November 2007, 10:56 AM   #2
JC951t is offline JC951t  Taiwan
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Hmmm, I'm surprise theres no reply.
I know there are many ways to skin a cat.
Just wanted to seek opinions from others
in this forum.

Thanks
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Old 11th November 2007, 11:41 AM   #3
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Maybe the reason is because there is no answer to your question. Ask 5 people and you get 6 opinions because it is all subjective.

Maybe you should just ask: What reg have you used for your .....

Jan Didden
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Old 11th November 2007, 11:58 AM   #4
JC951t is offline JC951t  Taiwan
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Hi Jan,
Thanks for the reply. Yes I know it's very subjective.
Built a few variations including . Ex with TL431, 3 terminal
with LT regulators, Sulzer etc. Even tried Guildo Tents
suggestion at placing caps at the ic's vdgn or adgn pins
with an inductor to reduce capacitance n reducing ground
loop. It seems that different regulators do instill a sound
of their own on the dac. Some better some worst.
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Old 11th November 2007, 05:11 PM   #5
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Default Re: Best regulated power supply.

Quote:
Originally posted by JC951t
Hi Guys,
With all the interest in Nos, I was wondering
if anyone could share their experiences as to
which regulator design is best suited for the
TDA 1541 in terms of sound quality.

Thank you

Hi

WIth power supplies, a few parameters are important:

- Input impedance
- Input to output rejection
- Output impedance
- Output current / voltage
- Load ripple, sink - source requirements
- Output noise

I may have forgotten a few......

Depending on the circuit demands, one can optimise the circuit, whereas the load requirements often define the type of reg: series or shunt.

best

Guido
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Old 12th November 2007, 05:16 AM   #6
JC951t is offline JC951t  Taiwan
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Hi Guido,
Thanks for the advice.
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Old 12th November 2007, 09:51 AM   #7
JC951t is offline JC951t  Taiwan
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Join Date: Sep 2006
Hi Guido,
If you're reading this. May I ask what type
of inductor do you recommend for connection
to the vdd pins of a dac ? I could only get ones
that are coil round a ferrite. Problem with this
is that the sound is darker & not as lively as
without the inductor.

Many Thanks
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Old 12th November 2007, 10:25 AM   #8
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Quote:
Originally posted by JC951t
Hi Guido,
If you're reading this. May I ask what type
of inductor do you recommend for connection
to the vdd pins of a dac ? I could only get ones
that are coil round a ferrite. Problem with this
is that the sound is darker & not as lively as
without the inductor.

Many Thanks

Hi

I use ferrite beads, typically > 100 ohms at 10 MHz, for example Murata BL02RN2R1M2B (Farnell 9526846).

When using chokes, always make sure not to create a resonant network with the decoupling cap. This affects sound quality.

best

Guido
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Old 13th November 2007, 05:07 AM   #9
JC951t is offline JC951t  Taiwan
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Thank again Guido.
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Old 13th November 2007, 06:14 AM   #10
suvatn is offline suvatn  Thailand
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TDA1541 use 3 supply +15, +5, -5.

On my design, I used regulator +18V thru +8V and -8V,
all of them thru ferrite coil and TL431.

Other to be consider is grounding.
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