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Old 21st May 2006, 09:31 AM   #1
weegs is offline weegs  New Zealand
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Cool tda1541 decoupling caps

Hi Team I am building a non sampling da converter using two tda1541 si chips
This design is based on the leshsa dac off the net .
I am looking for .47-1uf polyproperlene 50volt .They need two be real small as I am using a circuit board and things are tight, has any one got a good source
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Old 13th September 2006, 08:54 PM   #2
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You should find in google search MOUSER electronics or DigiKey or type in Black Gate Nonpolar. Good luck.
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Old 14th September 2006, 06:18 AM   #3
PetrL is offline PetrL  Czech Republic
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I have built nos dac with single 1541. Did many experiments with these caps and can say 0.1uF polypropylene is enough for all pins except the two MSB pins, where I finally settled on 2uF MKT. Also there is no benefit (in my case) going above the 2.2uF here. These 2 pins have huge impact on the sound unlike the others (though they also have). So I advise not to stick on particular type/value and order more at once.

Don't know if for twin dac would be the same, though.
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Old 14th March 2007, 07:57 PM   #4
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Can anyone explain how to choose the 'correct' value for the decoupling caps and what effect this has on the sound.

Schematics I've seen

1) 100nF on each pin (from the datasheet)
2) 4.7uF tant on the two most significant bits on each side (13,12,18,19) and then 220nF on the remaining 10 pins
3) film caps (unknown value) on all 14 pins with an additional Oscon (unknown value) on each of the two MSB pins.

Any thoughts or comments ?


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Old 15th March 2007, 12:40 PM   #5
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for the 14 coupling caps I still prefer 0.1uf MKP.

Finally I choose original Philips 0.1uf MKP & two the best was epcos 100V 0.1~0.15uf MKP & another one was siemens MKL 0.1uf.



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Old 15th March 2007, 02:30 PM   #6
weissi is offline weissi  Europe
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all with a lot of inductance....
regards / servus
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Old 15th March 2007, 04:10 PM   #7
lucpes is offline lucpes  Romania
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WIMA MKP 2 series offer pretty good quality in a small footprint: 5mm - 0.33uf, but you can solder an aditional cap on the other side of the board if you need for the MSBs.
We should no more let numbers define audio quality than we would let chemical analysis be the arbiter of fine wines. Measurements can provide a measure of insight, but are no substitute for human judgment. Nelson Pass
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Old 7th December 2013, 10:43 AM   #8
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I'm thinking about using c0g's in my RED BARON, what do you think? Those seem very good caps.
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Old 7th December 2013, 05:59 PM   #9
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It is good sounding for me without any capacitors...
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