Doubt that small CAP causes .

digi01 · 16th July 2003, 08:05 AM

It is disadvantageous that the CAP amount is too small.
USE so little capacitance'S CAP will bear bigger electric current even reduce the CAP'S life.Is it such

Nuuk · 16th July 2003, 08:26 AM

If I understand you correctly, the answer is no.

A capacitor has two ratings that you must understand.

The capcitance must be selected according to the use of that capacitor. For instance, if it is for decoupling, it needs to be quite high. If used for a filter, it can be very low.

The voltage rating is selected according to the voltage that will pass through it. Always use a capacitor that is 125% the voltage that will pass through it.

For example, if the voltage rails are 26 volts, you should use a capacitor with a voltage rating of 26 X 1.25 = 32.5. The nearest rating ABOVE that is 35 volts so use one of those.

mhennessy · 16th July 2003, 09:59 AM

Hi Nuuk,

I think he might mean ripple current. This is a valid concern, and something that I have worried about. The operational life of a capacitor life is proportional to many things, and ripple current is one of them.

But, most GainClones are relatively low-powered affairs, and most of us diy-ers value our hearing so we won't tend to run them at very high levels for long. Hopefully, anyway

Cheers,

Mark

digi01 · 17th July 2003, 12:50 AM

mhennessy,thank you.

I worried about are ripple current.
My friend helps me to look over different brand CAP manual,Ripple current is as follows:
ELNA-SILMIC 1.985Arms£¬
TONEREX 1.200Arms,
ELNA-FOR AUDIO 1.35Arms,
Ordinary product 1.400Arms.

I will study English hard

Nuuk · 17th July 2003, 07:54 AM

Quote:

ELNA-SILMIC 1.985Arms£¬

I understand that those capacitors are no longer being produced

S.C · 17th July 2003, 09:26 AM

Oh digi01 sounds familiar in Head-Fi's/HeadWize's User.
Nice to meet you, I am also learning English as mush as I can. HK I am coming back in August. baby !

P.S: www.dictionary.com Good site!

digi01 · 17th July 2003, 09:43 AM

S.C,Thank you.It is a good site

Nuuk,Your websites are very good,help me a lot,thanks!

Nuuk · 17th July 2003, 10:34 AM

Quote:

Nuuk,Your websites are very good,help me a lot,thanks!

My pleasure. I'm sorry that I can't write it in Mandarin or Cantonese

16th July 2003, 08:05 AM	#1
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	Doubt that small CAP causes . It is disadvantageous that the CAP amount is too small. USE so little capacitance'S CAP will bear bigger electric current even reduce the CAP'S life.Is it such

16th July 2003, 08:26 AM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	If I understand you correctly, the answer is no. A capacitor has two ratings that you must understand. The capcitance must be selected according to the use of that capacitor. For instance, if it is for decoupling, it needs to be quite high. If used for a filter, it can be very low. The voltage rating is selected according to the voltage that will pass through it. Always use a capacitor that is 125% the voltage that will pass through it. For example, if the voltage rails are 26 volts, you should use a capacitor with a voltage rating of 26 X 1.25 = 32.5. The nearest rating ABOVE that is 35 volts so use one of those. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

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16th July 2003, 09:59 AM	#3
mhennessy diyAudio Member Join Date: Jun 2002 Location: UK	Hi Nuuk, I think he might mean ripple current. This is a valid concern, and something that I have worried about. The operational life of a capacitor life is proportional to many things, and ripple current is one of them. But, most GainClones are relatively low-powered affairs, and most of us diy-ers value our hearing so we won't tend to run them at very high levels for long. Hopefully, anyway Cheers, Mark

17th July 2003, 12:50 AM	#4
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	mhennessy,thank you. I worried about are ripple current. My friend helps me to look over different brand CAP manual,Ripple current is as follows: ELNA-SILMIC 1.985Arms£¬ TONEREX 1.200Arms, ELNA-FOR AUDIO 1.35Arms, Ordinary product 1.400Arms. I will study English hard

17th July 2003, 09:26 AM	#6
S.C diyAudio Member Join Date: Jun 2003 Location: Milpitas	Oh digi01 sounds familiar in Head-Fi's/HeadWize's User. Nice to meet you, I am also learning English as mush as I can. HK I am coming back in August. baby ! P.S: www.dictionary.com Good site!

17th July 2003, 09:43 AM	#7
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	S.C,Thank you.It is a good site Nuuk,Your websites are very good,help me a lot,thanks!