Power supply caps: They're not all equal - Page 2 - diyAudio
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Old 27th February 2014, 07:42 AM   #11
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Originally Posted by infinia View Post
IMO ripple ratings is a throw away number pretty much
Cant be verified easily > generated by # crunchers at the factory / it's kinda like MTBF of a HDD LOL
What is the exact definition of a "ripple rating"? It seems like a vaguely defined parameter. I like measurements, equations, and graphs.
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Old 27th February 2014, 09:22 AM   #12
AndrewT is offline AndrewT  Scotland
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the specified maximum continuous AC current passing through the capacitor that allows the capacitor to meet all it's other specifications.
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Old 27th February 2014, 09:23 AM   #13
AndrewT is offline AndrewT  Scotland
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If you can run the capacitor at 10% of it's ripple rating, then it will achieve it's other specifications for a lot longer.
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Old 27th February 2014, 11:40 AM   #14
DF96 is offline DF96  England
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Originally Posted by Fast Eddie D
What is the exact definition of a "ripple rating"? It seems like a vaguely defined parameter.
It is a vaguely defined parameter, yet a very important one. See post 12 for as good a definition as you are likely to get.
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Old 27th February 2014, 12:24 PM   #15
infinia is offline infinia  United States
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Originally Posted by DF96 View Post
It is a vaguely defined parameter, yet a very important one. See post 12 for as good a definition as you are likely to get.
If it's vague, how could it be important for a design engineer> LOL

probably weight/ mass is a better indication of durability IMO
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Last edited by infinia; 27th February 2014 at 12:29 PM.
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Old 27th February 2014, 03:03 PM   #16
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Originally Posted by AndrewT View Post
the specified maximum continuous AC current passing through the capacitor that allows the capacitor to meet all it's other specifications.
Thank you.

Quote:
If you can run the capacitor at 10% of it's ripple rating, then it will achieve it's other specifications for a lot longer.
Sounds like a good idea.
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Old 27th February 2014, 03:30 PM   #17
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The life hours are under load cycle at high temp. Used in the average amplifier they could decades on 24/7, possibly. They usually last a lot of years.

Are they equal? No...
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Old 27th February 2014, 04:01 PM   #18
AndrewT is offline AndrewT  Scotland
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They usually last a lot of years.
Probably because they are run at far cooler than the rated maximum temperature.

The internal heat generating mechanism is the ESR times the ripple current.
The external heat source is the Ta.
There is a further short term heat source. Leakage current times ESR.

Reduce the ripple current and reduce the Ta and the capacitors will generally last 10 times to 1000 times the lifetime quoted in the specification.
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Old 27th February 2014, 04:19 PM   #19
infinia is offline infinia  United States
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trusted vendors + higher temp rating 105*C + lower esr = better long lasting capacitors full stop ,
the ripple current is just a numbers game.

the Big Ones usually last much longer than the little ones.
next up how to buy Automotive Batteries LOL
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Last edited by infinia; 27th February 2014 at 04:28 PM.
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Old 27th February 2014, 06:22 PM   #20
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Quote:
Originally Posted by infinia View Post
higher temp rating 105*C + lower esr = better long lasting capacitors full stop ,
the ripple current is just a numbers game.
If you really believe that, you may place a nice 105C, low esr cap of sufficient voltage, and a beefy diode across a beefy transformer secondary while you sit on that cap for a few minutes = all specs met except ripple current, that's just a numbers game.

I'd like to see your lower back region after that experiment.

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