hi all, this may have been asked/answered before but I couldnt find the answer, can I replace caps with a lower farad value but a higher voltage rating? I'm not sure if it's safe or if anyone has tried already. I ran out of caps of the right size and I only have higher voltage with lower farad value caps left.
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Re: Capacitor question
it is better than a lower farad rating and same voltage. YMMV though. what is the difference in farad rating?
try not to decrease too much because it may affect stability, capacitance on boards is usually minimal anyway. -
Re: Capacitor question
well i have like 100uf at 25 volts or so... I wasnt going to try it because it seems a little low. How much would be safe to decrease the capacitance? these would replace 1000uf at 6.3 voltsComment
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Re: Capacitor question
that seems far too low, i have seen on boards 470uf 16v and 330uf 25v used in places where 1000uf 6.3v would normally be used.
it depends where it is used really, on input caps and vcore i would not recommend to decrease the capacitance much, depends really if you are using one of the more powerful processors for the board design or a low power one. in the case of not having the right caps if you have a row of caps in parallel you could double the capacitance and use half the number of caps for instance, populating every other position. that would be the same result as long as the total capacitance is the same for that row.
on other positions of the board you might be luckier and able to use a lower value but 100uf is really low and best to forget it do the job properly.Last edited by willawake; 04-24-2006, 11:06 AM.Comment
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Re: Capacitor question
cool thanks for the info. I'll have to double check the board position when I get home. They arent on the input caps or vcore caps. I replaced the vcore caps with ones I had of the same rating and the input caps were good still (panasonics). The proc is actually a mobile celeron, but I was planning on increasing the voltage on it.Comment
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When I tried to repair LG 29 inch CRT TV, I found that the ESR value of samyoung SMS capacitor(160v 2.2uf), which is very close to D1879 transistor, is 6 ohm.
Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
Rubycon YK DataSheet (b... -
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I decided to verify that the batteries were... -
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I hope these photos make it clear which component I am referring to:
(yes, the soldering is a bit botched from removing the blown one, I know)
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(TL;DR skip the first paragraph)
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Hello,
I'm reading an article about the "capacitor plaque" in early 2000s and I have found one sentence I cannot understand.
The normal lifespan of a non-solid electrolytic capacitor of consumer quality, typically rated at 2000 h/85 °C and operating at 40 °C, is roughly 6 years. It can be more than 10 years for a 1000 h/105 °C capacitor operating at 40 °C.
What this 2000h or 1000h means? Why 1000h capacitors have longer life span?
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