TDA1541A and the 14 decoupling caps - diyAudio
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Old 1st December 2003, 02:23 PM   #1
Bricolo is offline Bricolo  France
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Default TDA1541A and the 14 decoupling caps

What is the purpose of those caps?

I'm looking for inexpensive ones to use for that, something that costs less than 1$ per cap.

Is the 0.1uF value important? I saw that Thorsten uses a 15uF oscon on the MSB, why not using large ones on each pin?
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Old 1st December 2003, 04:24 PM   #2
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for best compromise use 1 uF all over - best quality you can afford......
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Old 1st December 2003, 04:31 PM   #3
Bricolo is offline Bricolo  France
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but why 1uF instead of the 0.1uF in the datasheet? What exactly are these caps doing?
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Old 1st December 2003, 04:50 PM   #4
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Quote:
Originally posted by Bricolo
What exactly are these caps doing?
Salut , Bricolo!

These capacitors are for smoothing the ripple caused by the periodic switching of currents in the chip..in the seven most significant bits and are externally connected.

At frequency that the DAC work i see no need to go for more that the capacity that philips give in the data sheet..

Au revoir!
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Old 1st December 2003, 05:59 PM   #5
Peter K is offline Peter K  Netherlands
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Default Re: TDA1541A and the 14 decoupling caps

[QUOTE]Originally posted by Bricolo
I'm looking for inexpensive ones to use for that, something that costs less than 1$ per cap.
QUOTE]

Like Peter Daniel I have used BG 0.1 uF/50V NX-HQ caps which costed me Euro 1,39 a piece. They seem to work fine but I have not compaired to other types.

Best regards,

Peter K
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Old 1st December 2003, 06:01 PM   #6
Bricolo is offline Bricolo  France
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This is too expensive for me
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Old 1st December 2003, 08:29 PM   #7
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mr. walt jung did an investigation years ago in the pooge articles, and found that 1 uF was the "best" solution - he used polycarbonat caps......bricolo - WIMA mks4, 1 uF will suit your wallet just fine.
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Old 1st December 2003, 08:30 PM   #8
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I used those green ROE 1u caps in other player and they also sounded good.
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Old 1st December 2003, 08:40 PM   #9
Bricolo is offline Bricolo  France
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Quote:
Originally posted by Peter Daniel
I used those green ROE 1u caps in other player and they also sounded good.

The ones that are on the picture you took from the S2 dac?
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Old 1st December 2003, 10:15 PM   #10
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Yes. I had BG there before and I removed them to use in a different DAC, and it seemed like those green ROE sound smoother and definitely not worse.
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