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Is 50v cap too high for an amp with 32v power supply?
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Mp3:
Hi everyone, upgrading the caps in my FX Audio D802, but one problem is the power supply is 32v and the main power caps are rated for 35v.... so i want to put in something with a higher tolerance, but all i can find is 40v or 50v, and there are only a couple choices in 40v, my question is 50v too high voltage for use with a 32v power supply? Or should i get some better quality 35v caps?
Rerouter:
It is fine as long as
1. They fit
2. The ESR is not rubbish for the voltage.
exe:
Actually, I suggest using 50V parts to put some safety margin:

1) the cap voltage rating is *absolute maximum* rating that is not to be exceeded. Working close to maximum voltage is pushing it to the limit
2) parts with higher voltage last longer (under same conditions)
3) parts with higher current last longer (under same conditions)
3) there are different temperature ratings. Cheap ones have 85C rating. Higher temperature parts (105C and 125C) are more durable, but cost more and have bigger size.

Just be sure new parts meet ESR and max ripple current requirements.

PS here is seems to be a nice article: http://www.learningaboutelectronics.com/Articles/What-does-the-voltage-rating-on-a-capacitor-mean
radiolistener:
capacitor should have 30-40% voltage margin. For 32 V, you're need at least 32 * 1.4 = 45 V rated capacitor.
In your case it's better to use 50 V (or higher) rated capacitor.

Voltage rating on the capacitor is the maximum voltage limit for the capacitor. If you exceed it, it may explode or make short circuit. Also note that capacitor voltage rating is decreased with time, so if you plan to use your device for a long time, you're need enough voltage margin.
Zero999:

--- Quote from: radiolistener on April 21, 2019, 11:25:46 am ---capacitor should have 30-40% voltage margin.
--- End quote ---
That's a bit of a sweeping statement. In reality, it depends on the capacitor and how well regulated the supply voltage is. For example, on a well-regulated 5V supply, a 6.3V electrolytic capacitor would be fine. Using a much higher voltage rating than necessary has disadvantages: increased cost, size and ESR.


--- Quote ---For 32 V, you're need at least 32 * 1.4 = 45 V rated capacitor.
In your case it's better to use 50 V (or higher) rated capacitor.

Voltage rating on the capacitor is the maximum voltage limit for the capacitor. If you exceed it, it may explode or make short circuit. Also note that capacitor voltage rating is decreased with time, so if you plan to use your device for a long time, you're need enough voltage margin.

--- End quote ---
Yes, this is true. In this case if the capacitor is being replaced with a higher voltage unit, it'll be fine.


--- Quote from: Mp3 on April 20, 2019, 10:45:29 pm ---Hi everyone, upgrading the caps in my FX Audio D802, but one problem is the power supply is 32v and the main power caps are rated for 35v.... so i want to put in something with a higher tolerance, but all i can find is 40v or 50v, and there are only a couple choices in 40v, my question is 50v too high voltage for use with a 32v power supply? Or should i get some better quality 35v caps?

--- End quote ---
Why do you think the capacitors need upgrading? Is it an old amplifier and you think there's a high change they'll need replacing? If not and the capacitors are good, there's no point, just leave it as it is!
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