Ripple current, C1 and C2 in SSE - diyAudio
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Old 21st January 2013, 11:21 PM   #1
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Default Ripple current, C1 and C2 in SSE

I don't know anything about ripple current. I see that electrolytic caps have a
ripple current rating, how important is it ?
I'm ordering parts at Digi-Key for the SSE but they don't have any stock of
the specified part nos. for C1 and C2
For C1 are these suitable substitutes 33uf-cap or 39uf-cap . These have
lower ripple current rating than the one specified in the parts list.
For C2 is this a suitable substitute 120uf-cap

Otherwise can anyone suggest suitable substitutes from Digi-Key. I prefer to
order from Digi-Key because they have lower shipping charge to Canada and
there are no brokerage fees.
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Old 22nd January 2013, 03:17 PM   #3
rknize is offline rknize  United States
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Your links don't work for me, but I wouldn't worry too much about the ripple current rating. Any standard cap will work in this position. The CDE caps suggested by spoon are fine choices.
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Old 22nd January 2013, 04:24 PM   #4
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Quote:
Originally Posted by rknize View Post
Your links don't work for me, but I wouldn't worry too much about the ripple current rating. Any standard cap will work in this position. The CDE caps suggested by spoon are fine choices.
Thanks Russ. I'll go with the ones suggested by Spoon109. For C1 I read
a few posts including one by yourself that suggested a 33uf or 39uf cap
would be better in that position. That is one of my reasons for asking about
those, the specified ripple current rating is much lower than the 47uf cap
specified in the purchase list, 380mA vs 630mA

Just for my information, are you saying that for C1 and C2 the ripple current
rating should'nt matter as long as the voltage and capacitance values are as
specified ?
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Old 22nd January 2013, 05:07 PM   #5
rknize is offline rknize  United States
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Yes. The ripple currents seen by the caps in this amp are fairly modest. The lower cap suggestion is mainly to make life for the tube rectifier a little easier. Also, there was a supply problem for the 47uF part a while back. It won't affect the filtering capability of the power supply very much, especially if you are using a choke.
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