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Old 11th March 2004, 12:59 PM   #1
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Default decoupling TDA1541A

hi,
2 questions

Is WIMA MKS-2 100nF ok for the 14 decoupling caps of 1541,

and why is on some schematics pin 13 and 18 decoupled with larger caps (some uF) ?
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Old 11th March 2004, 04:48 PM   #2
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Those are the MSB pins. Arcam used tantalum caps for that but I sure would not recommend those unreliable caps.

Wima MKS is OK ( no more than that ) but 220 nF instead of 100 nF is slightly better. Avoid long wires to the caps ( bigger is not better here ). Peter Daniel tried BG NX Hi Q there with good results IIRC. I never tried them on that spot.

Discussions about the value can last long, some will propose 1 uF. Better try it and choose yourself what you like best. Datasheet says 100 nF so that should be enough. Quality of the caps has more priority than the 100 nF/220 nF/ 1 uF question IMO. Polypropylene ( Wima MKP 10, 100 nF or 220 nF ) caps are a wise choice considering cost/quality.
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Old 11th March 2004, 05:53 PM   #3
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But the size is also a concern, since you have to place 7 caps per side.

I wanted polypropylene too, but the 1uF ones were way too big.
I'm on the way to buy some wima MKS-2 too

PS: jean-paul, are you sure about the location of the MBS pins? Elso and Thorsten don't agree about that
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Old 11th March 2004, 06:25 PM   #4
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Default decoupling TDA1541A

I test many decoupling caps in the 1541a. I feel tin foil is quite good.

this is my opinion.

thanks

thomas
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Old 11th March 2004, 06:28 PM   #5
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Just checked for you and in various schematics of brands that bought their stuff and technology from Philips pins 13 and 18 have the label MSB. For instance Arcam used 0.47 uF on that pins. I used the same value on all pins like the datasheet says.

Of course size is a concern as I tried to make clear. 220 nF MKP will fit, I never thought of using 1 uF.
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Old 11th March 2004, 06:31 PM   #6
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Hi all,

I have tried Philips MKP (130nF) and Siemens stacked film (470nF) for those decoupling caps. Both sound smooth and natural. Personally prefer Siemens stacked film more (may be the value?)


Will try BlackGate N, Nx soon.

Below pics showing the board using Philips MKP.

pics for Siemens stacked film will follow.
Attached Images
File Type: jpg 1541-dig.jpg (60.8 KB, 3670 views)
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Old 11th March 2004, 06:34 PM   #7
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Nice board ! Wish I got the design around the TDA right.
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Old 11th March 2004, 06:46 PM   #8
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The wimas MKP-2 0.1uF are the same size as the MKS-2 1uF

So, I will be able to try, when I'll be rich
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Old 11th March 2004, 06:47 PM   #9
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Quote:
Originally posted by jean-paul
Just checked for you and in various schematics of brands that bought their stuff and technology from Philips pins 13 and 18 have the label MSB. For instance Arcam used 0.47 uF on that pins. I used the same value on all pins like the datasheet says.

Of course size is a concern as I tried to make clear. 220 nF MKP will fit, I never thought of using 1 uF.

so Thorsten was wrong
http://www.fortunecity.com/rivendell...io/Adagio.html
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Old 11th March 2004, 06:52 PM   #10
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I think that's an error in the drawing. It seems to me that the creator of the chip knows what pin is MSB. When the same value for all pins is used we won't need to discuss about that

BTW I have an amount of MKP10 100 nF and they were very cheap. No need to be rich for buying MKP10. They're small too. They may not be the best but their price/quality ratio is hard to beat.

Who said Mundorf ?
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