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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 31st Jul 2021, 9:38 am   #21
Craig Sawyers
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Default Re: What is ripple current?

I've just done a straw poll of large can electrolytics on Farnell. And all of them have data for 120Hz and 10kHz.

120Hz because most of them are from the US; Epcos, Vishay, Kemet etc

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Old 31st Jul 2021, 2:00 pm   #22
Refugee
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Default Re: What is ripple current?

If the capacitor is used to couple the speaker to a single rail transistor amplifier all of the current delivered to the speaker is ripple current no matter what.
The frequency is the full audio range too.
This application has been about for many years and we have not had too many fail.
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Old 1st Aug 2021, 1:00 pm   #23
ms660
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Default Re: What is ripple current?

Quote:
Originally Posted by Craig Sawyers View Post
There is a classic paper that covers all this, Otto Schade "Analysis of Rectifier Operation" July 1943. You can find this is downloadable if you google carefully.

There are other good references that cover that, including databooks, but looking through them, they all refer back to the design graphs of Schade.
And if you're into maths checkout the analysis by Roberts etc.

Lawrence.
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Old 1st Aug 2021, 5:13 pm   #24
kalee20
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Default Re: What is ripple current?

I'd have generally said that a higher value cap will have a higher ripple current rating (assuming the case size is the same) - it's the voltage rating which will fall. Higher capacitance implies bigger electrode surface area, thinner electrodeposited oxide film, both of which will give rise to lower ESR. And it's ESR which determines the ripple current rating.
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