Hi , i just bought some 47uf 50v caps from farnell , the esr of the cap i took out was around 0.8 the new ones measure 1.8 which seems too high , are these a bad batch do you think ?
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Re: high esr on new rubycon caps
You'd have to look at the spec for the part. Did you buy the same mfr and series or an equivalent part?PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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Re: high esr on new rubycon caps
what series is it?Comment
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Re: high esr on new rubycon caps
The caps i removed were JEC cd110 these are what i used to replace them :
https://uk.farnell.com/rubycon/50yxm...50v/dp/1281851Comment
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Re: high esr on new rubycon caps
those are not low-impedence capsComment
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Re: high esr on new rubycon caps
So as a general rule when replacing caps , i would need to see if the caps removed were low esr or not , ?
i just thought i needed to check capacitance value and voltage , .Comment
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Re: high esr on new rubycon caps
depending on the use, different things may be required.
a high frequency circuit needs low esr, and low frequency or dc psu's for example will not care but ripple current handling will play a bigger role.Comment
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Re: high esr on new rubycon caps
Thanks for that info , learnt something new today , I will pay more attention when looking at esr charts in future .
So there must be different charts for low esr ?Comment
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Re: high esr on new rubycon caps
esr is stated in the datasheets of low esr caps,
but not in "general purpose" caps.Comment
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Re: high esr on new rubycon caps
So for power supply boards for example if i had no schematic or the capacitor which needed to be replaced, make could not be identified would it always be better to use low esr caps , ?Comment
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Re: high esr on new rubycon caps
yesComment
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Re: high esr on new rubycon caps
Thank you for the great advice ..
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Re: high esr on new rubycon caps
Using a low impedance part for general purpose decoupling may be moderate overkill, but the extra cost is moderate (or less), and the low impedance part might last longer.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
****************************
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
****************************Comment
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Normally, I never post repairs this quick after I do them, because… I am usually very slow.
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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Hi,
I'd like to recap some of my old mainboards (they are from 1998) before switching them on again for the first time after many years in storage. All caps still look good from the outside.
There are three mainboards:
- ASUS P5A rev 1.04
- ASUS P2B-S rev 1.03 "Rubycon"
- ASUS P2B-S rev 1.03 "Chemi-Con"
If you are interested in their specs, The Retro Web has pages for the P5A and the P2B-S.
They all have many 1000uF 6.3V 105°C capacitors. But there are some differences I cannot figure out.
P5A
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I'm getting ready to put in a capacitor order. I generally look for nichicon, panny, kemet, or united chemicon, and I'm noticing that there aren't any 1000 hour caps anymore, and not many 2000 hour caps. Most of the caps are rated around 5000 hours or better. Last time I ordered, 1000 hour caps were pretty much most of them, and the very few 10,000 hour caps had pretty bad specs.
So what's the deal, have we made major progress with capacitor reliability in the past few years? Are these high lifetime caps ok to use? It's not that I wouldn't welcome the change, I really would, I'm... -
Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and... -
I thought my tv power supply was stable. It's been stable for a few weeks since I swapped in nichicon, united cc, panasonic caps to replace the cheap china caps.
But today it caused my tv to have a flickering spasm again.
what a letdown.
I swapped back my backup power board which has cheap china caps, and the tv backlight stopped flickering.
Sometimes these high quality caps just don't make things better.
Comment