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Old 23rd January 2015, 02:17 PM   #1
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Default electrolitic capacitor types for amps/preamps

Hi members,i am going to buy some electrolitic capacitors to a chinese manufacturer and y want to know which one of them are more recomendable for amps/preamps .
I have heard a lot of information about the better brands like ELNA-BLACK GATE-SPRAGUE-ILLINOIS and so.
But this time i dont mind the brand because in my case i am doing a cheap project.
The topic is about when you have to buy inside a brand(dont mind which one),they shows several types of electrolitic,and i want to know which type are more properly for building amps. Considering always the radial type and the desired range is 1uF-10000uF i have find the following types:

THE MAIN LINK:KLS leading supplier of electronic components

1)High ripple current= http://www.cnkls.com/pdf/KLS10-CD13N(PK).pdf
2)High frecuecy/low z= http://www.cnkls.com/pdf/KLS10-CD11H(GF).pdf
3)long life= http://www.cnkls.com/pdf/KLS10-CD11T(MT).pdf
4)high precision stability= http://www.cnkls.com/pdf/KLS10-CD117(SH).pdf
5)color tv standard= http://www.cnkls.com/pdf/KLS10-CD117(SH).pdf
6)low leakage current= http://www.cnkls.com/pdf/KLS10-CD11L(ML).pdf
7)high temp(105 C)= http://www.cnkls.com/pdf/CD81.pdf

Some body could recommend for me which would be more properly for:

-Power Source(psu)
-audio or guitar amps/preamps application(coupling,decoupling,by pass)

Best regards!
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Old 23rd January 2015, 04:50 PM   #2
AndrewT is online now AndrewT  Scotland
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All those headings are "special" duty capacitors.

Ordinary commercial grade electrolytics are good enough for the smoothing duty after a bridge rectifier @ mains frequency.

But ordinary commercial grade capacitors MUST MEET specification.
Fakes are no good if they fail to meet the genuine specification.
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Old 23rd January 2015, 05:27 PM   #3
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Default types

Thanks Andrew, but my doubt is about to choose between those caps that i have detailed below,which one of them are more properly for audio apps,i have already have some idea but other opinions are always welcomed!
BR!
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Old 24th January 2015, 07:08 AM   #4
AndrewT is online now AndrewT  Scotland
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AC coupling caps need to pass the wanted frequencies.
These have nearly zero AC voltage across them and thus nearly zero distortion due to them.

Filtering caps have a significant AC voltage across them and thus the possibility of distortion due to them.
For this we tend to avoid all electrolytics and many plastics and insulator/s that begin to leak with age.
Use polypropylene, or polystyrene, or NP0/C0G ceramic and possibly silvered mica.

Decoupling caps must not aggravate ringing and/or oscillation. This needs resistance to damp the high Q that can exist by adding caps with a little inductance between/around them.

Bypass caps?
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