Per RIFA documentation the date codes are according to IEC 60062 and BA6 would be June 1990 and BN8 and BN9 would be August and September 2001. But if the latter two are very old they could be from the previous cycle of the date codes which would make them about 1980!
Does anyone know what 'lytic caps would be the most ideal for a DAC chip mid-rail decoupling? The caps are situated very close to the DAC chip. I've been using Nichicon FG there and so far so good but who knows if there is any better solution? NX seems overkill for such a position. I'm all ears. 
Sorry for bumping an old thread but this is too interesting to be drowned.
Sorry for bumping an old thread but this is too interesting to be drowned.
Thanks for your suggestion. To be exact, I need them for the VMIDR and VMIDL (pin 11 and 18) respectively for Wolfson WM8741. The datasheet indicates that these are analog outputs though.
The Rubycon ZA/ZL (also ZLG/ZLH) are good whether for analog or digital. Some people even claim the ZA/ZL are better than black gates.
Does anyone know what 'lytic caps would be the most ideal for a DAC chip mid-rail decoupling? The caps are situated very close to the DAC chip. I've been using Nichicon FG there and so far so good but who knows if there is any better solution? NX seems overkill for such a position. I'm all ears.
Sorry for bumping an old thread but this is too interesting to be drowned.
Try to learn from Peter Daniel
he used 1/4 capacitance for BGN with bigger or same voltage
example 4700uf 16v -- > 1000uf 50v, 470uf 50v -- > 100uf 50v
( ML 38 Preamp, Sony CD, Shigaclone )
he used 1/2 capacitance for BGN with lower voltage
example 220uf 35v -- > 100uf 16v ( Aleph JX )
Thank you for your suggestion. The PCB I'm working with have limited spaces though and besides, based on WM8741's datasheet, 10uF would be enough to function properly.
No need for very low ESR cap there, more important is low noise. Low noise = low leakage current, no solid polymers there (OSCON & similar).
My ears are are happy with something in 47uf - 220uF range, depending on DAC used, but YMMV
Another option is to use opamp buffered voltage reference. Voltage reference should be low noise + well filtered (RC). Low noise opamp set to unity gain.
My ears are are happy with something in 47uf - 220uF range, depending on DAC used, but YMMV
Another option is to use opamp buffered voltage reference. Voltage reference should be low noise + well filtered (RC). Low noise opamp set to unity gain.
ultimative knowledge about caps - Mr. Jens Both: 25 Years Experience
have a look to this website (unfortunately only in German)
Elko-Consulting
good description about a wide range of problems of caps and the reasons;
also many pics arround exploded caps
have a look to this website (unfortunately only in German)
Elko-Consulting
good description about a wide range of problems of caps and the reasons;
also many pics arround exploded caps
Hi okmog,
For decoupling, polyester capacitors (MKP, MKT, MKS...) suits better than electrolytic capacitor.
Statement from Douglas Self about Capacitors - online for read
Very interesting facts arround capacitors in audio applications -
go to page 51 from the read sample about
Small Signal Audio Design - Google Bücher
(new Book: "small signal audio design")
Very interesting facts arround capacitors in audio applications -
go to page 51 from the read sample about
Small Signal Audio Design - Google Bücher
(new Book: "small signal audio design")
But they sound so bad.
Small electrolyts for decoupling brings the most homogen sound.
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I have check this again and I can read this pages. Obviously the read sample pages must be different in each countries.You must be kidding ! Side 42 to 62 is missing ! How did you do that ?
I haven't respect this fact - sorry.
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Hi Erlend Sæterdal,
Do you mean that electrolytic capacitors sound better than MKP capacitors?But they [polyester capacitor polyester capacitors (MKP, MKT, MKS...) ] sound so bad.