(Topic ID: 254904)

Need Some Help Determining Capacitor Voltage Rating

By jimgravina

4 years ago



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#1 4 years ago

Hey Guys,

Been trying to trouble shoot a weird speaker crackling/popping sound coming from my left speaker. I have replaced all of the tall electrolytic capacitors, and now I am moving on to testing and replacing the tiny axial ones (not sure what they are called, and hoping this may fix my issue).

I am not sure how to determine the voltage rating on these. I know where they are on the schematics, and can see their capacitance rating, but I do not see a voltage for these. I have attached some photos of the schematics of some of them. I need to order a few and just need some help on which voltage rating to get....

Thanks for the help!
Jim
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#2 4 years ago

Normally I use 2-3x working voltage for long life. So in the red box I put a yellow oval on the working voltage. So for C26-28 I would use 35 volt caps.
Now for the green box I would use 16 volt for C-31 and 35 volt for C-32 and 33. If you look C-31 only uses half of the available voltage.

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#3 4 years ago

Ah I see! I’m still learning a lot of this but that makes sense. I could only find 50v caps on mouser at that capacitance...is that too much? Or is it fine, and your just paying a little more for the higher voltage?

Thank you!

Jim

#4 4 years ago
Quoted from jimgravina:

I could only find 50v caps on mouser at that capacitance...is that too much? Or is it fine, and your just paying a little more for the higher voltage?

It's more of a size issue. As the working voltage of a cap goes up, so does the size of the cap. Using a cap with a higher working voltage isn't a issue, it does increase the cost of the part. Over the last 20 years the size of caps has reduced @ 35%. The voltage numbers I gave you were the minimums I would use when looking for a replacement. You may only find 50 volt caps in the sizes you need because they can't be made in any smaller voltage.

#5 4 years ago
Quoted from GRUMPY:

It's more of a size issue. As the working voltage of a cap goes up, so does the size of the cap. Using a cap with a higher working voltage isn't a issue, it does increase the cost of the part. Over the last 20 years the size of caps has reduced @ 35%. The voltage numbers I gave you were the minimums I would use when looking for a replacement. You may only find 50 volt caps in the sizes you need because they can't be made in any smaller voltage.

Got it! Thank you so much...now I just hope this solves my issue
Jim

#6 4 years ago

Are these tiny capacitors “multilayer ceramic capacitors (MLCC)”?

I’m looking for three on mouser.com and just wanna make sure I’m getting the right type.

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