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Old 01-11-2023, 03:04 AM   #41
jiroy
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Default Re: Post help identifying capacitors here

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Originally Posted by rattlesnake View Post
Beautiful, thanks again
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Old 01-12-2023, 11:44 AM   #42
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Default Re: Post help identifying capacitors here

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Originally Posted by jiroy View Post
You always take the first value for Capacitance and the second for voltage , that's the standards .
Depends. I've seen plenty of sleeve-less / SMD electrolytics capacitors labeled with the capacitance first and voltage second. Actually, most SMD polymers and electrolytics are labeled like that. Some won't even have a voltage on there, but rather a voltage code letter. So if there is any standard anymore, it surely doesn't seem to be followed very well.

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Thank you

Does the "s" in "16s" mean volts? otherwise how can you tell what is what? I mean could there be a 10v 16F cap? how would you tell them apart?
The real teller here is the fact that 16 uF is not a standard capacitance value.

Generally, the standard values for capacitance are 100, 120, 150, 180, 220, 270, 330, 470, 560, 680, and 820... multiplied or divided by any coefficient number of 10.

So in the 10's range, you can have 10 uF, 12 uF (uncommon, but does exist), 15 uF, 18 uF (uncommon), 22 uF (very common!), 27 uF (uncommon), 33 uF, 47 uF (very common!) 56 uF, 68 uF, 82 uF... and a wrap again at 100 uF (10 uF x 10).

In contrast, voltage ratings follow a slightly different set of values.
For voltages below 10V, the common values are 2.5V, 4V, 6.3V, and 10V.
Between 10V and 100V, it's 16V, 25V, 35V, 50V, 63V, 80V, and 100V...
And for higher values, it's the same number multiplied by 10.... though there are a few additional values, like 200, 220, 315, 400, 420, and 450.
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Old 01-12-2023, 12:51 PM   #43
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Thumbs up Re: Post help identifying capacitors here

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Originally Posted by momaka View Post
The real teller here is the fact that 16 uF is not a standard capacitance value.
I thought so! But I wasn't familiar with all the values you described. Thank you for taking the time to enumerate them all. I'm sure I'll come back to this post some day.
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Old 01-16-2023, 04:02 PM   #44
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Default Re: Post help identifying capacitors here

I need help identifying this manufacturer.
On the logo the letter "m" is pretty obvious, with what could be the letter "L" attached under it (or just some hockey-stick looking graphical swoosh).
I’ve search capacitor.web.fc2.com and spent hours in google image search, to no avail.
Thanks in advance.

It's a 220 uF 16V from the switch-mode power supply inside an M-audio studio monitor. I suspect a low-ESR...
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Last edited by mach128x; 01-16-2023 at 04:07 PM..
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Old 01-16-2023, 04:13 PM   #45
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Default Re: Post help identifying capacitors here

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It's a 220 uF 16V from the switch-mode power supply inside an M-audio studio monitor. I suspect a low-ESR...
If it's in a SMPS, it probably is (or should be) low ESR.
But don't worry about identifying it or finding a datasheet for it. I stopped bothering to look up obscure manufacturers a long time ago. In all cases, I just use a low ESR capacitor from a known good Japanese brand (like Panasonic, Rubycon, Nichicon, and United Chemicon.) Never had issues replacing these obscure brands by such. In fact, these no-name garbage caps are so bad, that sometimes I've used very old Japanese general purpose capacitors for a repair or two, and even those have lasted longer than the cheapo caps.
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Old 01-16-2023, 05:10 PM   #46
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Default Re: Post help identifying capacitors here

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If it's in a SMPS, it probably is (or should be) low ESR.
But don't worry about identifying it or finding a datasheet for it. I stopped bothering to look up obscure manufacturers a long time ago. In all cases, I just use a low ESR capacitor from a known good Japanese brand (like Panasonic, Rubycon, Nichicon, and United Chemicon.) Never had issues replacing these obscure brands by such. In fact, these no-name garbage caps are so bad, that sometimes I've used very old Japanese general purpose capacitors for a repair or two, and even those have lasted longer than the cheapo caps.
I understand your point.
True, my hope was to find the original ESR rating, to find something in the same ballpark.
I was going to replace it with a good quality one in any case, for sure.

The question then, however. What's a good "low" ESR ? I've been told there can be such a thing as "too low" depending on the application. This particular cap sits on the output side, btw. (maybe this isn't the right section of the forum to discuss these details)
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Old 01-16-2023, 05:32 PM   #47
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Default Re: Post help identifying capacitors here

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The question then, however. What's a good "low" ESR ? I've been told there can be such a thing as "too low" depending on the application. This particular cap sits on the output side, btw. (maybe this isn't the right section of the forum to discuss these details)
Well, for the output of PSUs, generally you want to avoid the lowest ESR series... but even then it depends on the PSU, or rather its design.

Discontinuous / flyback designs (you can distinguish those fairly easily, as they don't have an output toroid after the rectifier(s)) don't care about too low of an ESR. They may get a little more noisy (as in, audible noise and not necessarily electrical noise) with very low ESR caps. But apart from that, they would work fine.

Continuous designs, on the other hand (these you can identify by a large output toroid inductor after the rectifier(s)) can be a little more picky. So with those, it's better to avoid the lowest ESR series, unless the PSU uses such already.

Which brings us full circle back to your question: how would we know what kind of "low ESR" caps the PSU used if we can't identify them?
- IME, I just haven't seen any of the no-name manufacturers to offer very low ESR caps. At best, they might have something that resembles United Chemicon KY or Nichicon HE or Rubycon YXG (which would be considered "mid-grade" low ESR more or less)... but almost never, really. More often than not, a cheap manufacturer's "low ESR" series will be barely a notch better than general purpose series from the Japanese manufacturers. The "better" ones might be comparable to entry-level low ESR series like Rubycon YXJ, Nichicon PS/PM/PW, UCC LXY/LXV, and Panasonic FC.

So this is why I don't bother to look up obscure brands anymore. I just pick some caps anywhere between entry-level low ESR and "mid-grade" low ESR, and know that I will be pretty safe with that choice. If I feel experimental (or if it's a discontinuous/flyback design), I sometimes go with very low / ultra-low caps that I might have on hand... and even with those, I haven't had any issues. At worst, I've had one or two flyback-based PSUs just "whine" a little more when lightly-loaded or in standby mode.

Last edited by momaka; 01-16-2023 at 05:40 PM..
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Old 01-18-2023, 03:52 AM   #48
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Default Re: Post help identifying capacitors here

Can someone identify this cap for me please?
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Old 01-18-2023, 05:13 AM   #49
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Default Re: Post help identifying capacitors here

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Can someone identify this cap for me please?
It's 100 mF , 25 volts ...
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Old 01-18-2023, 06:02 AM   #50
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Default Re: Post help identifying capacitors here

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It's 100 mF , 25 volts ...
Thanks - and the 7H bit doesn't matter? Will any package do the job?
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Old 01-18-2023, 06:25 AM   #51
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Default Re: Post help identifying capacitors here

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Thanks - and the 7H bit doesn't matter? Will any package do the job?
That a code for the manufacturer series . No , not any package , this is a SMD Capacitor and not TH one (through hole) .
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Old 01-18-2023, 06:55 AM   #52
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Default Re: Post help identifying capacitors here

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That a code for the manufacturer series . No , not any package , this is a SMD Capacitor and not TH one (through hole) .
Thank you very much
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Old 01-18-2023, 07:08 AM   #53
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Default Re: Post help identifying capacitors here

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Thank you very much
Welcome friend ; I left the choice of online order location to you as convenient . Otherwise , do tell .
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Old 02-12-2023, 11:29 AM   #54
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Default Re: Post help identifying capacitors here

Hello all, I'm in the process of trying to restore a motherboard for a 1993 IBM PS/1. I'm looking to recap and so far they all appear to be Nichicon electrolytic caps. I believe they are 68uf 16V, 22uf 50V, and 2.2uf 50V. However, I can't figure out the model number is to get their exact specs. Please see the attached image and any advice would be much appreciated.
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Old 02-12-2023, 12:31 PM   #55
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Default Re: Post help identifying capacitors here

Those blue Nichicon caps are VX series, but I've never seen a datasheet for the radial version (only axial). They're just plain 85C caps, so specs don't really matter (especially since they're 30 years old and probably still good unless they're leaking). There are places where ESR can be too low, but that isn't likely on a motherboard like that.

If an unknown series of a known brand counts for this thread, I found a power supply with G-Luxon LM series caps. I don't know if they're actually bad, but that computer had some weird cold boot problems. I'd lean toward these just being general purpose caps, and I really don't want to recap this thing anyway. It has a buttload of tiny caps, mostly 1F in a mix of 16V and 50V for some reason.
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Old 02-12-2023, 05:59 PM   #56
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Default Re: Post help identifying capacitors here

Hi Lti,

Thanks for the insights! The reason I was considering replacing the caps is that the motherboard over the past year has gotten more and more flaky to the point of no longer POSTing. I pulled all the hardware and tried booting with different cpus and memory with no luck and the PSU checks out.

That said do you have any concerns with the following caps?
68uf
https://www.mouser.com/ProductDetail/710-860010372005

22uf
https://www.mouser.com/ProductDetail/594-MAL203851229E3

2.2uf
https://www.mouser.com/ProductDetail...D225M050JA6AE3
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Old 02-13-2023, 09:28 PM   #57
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Default Re: Post help identifying capacitors here

Those will work, but the last two are a little expensive.
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Old 02-13-2023, 09:58 PM   #58
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Awesome, thank you so much for your guidance!
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Old 02-15-2023, 07:37 PM   #59
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Default Re: Post help identifying capacitors here

Hello, new user here. Trying to find what capacitor to replace a couple capacitors that went bad today, heard a double pop at power on and found 2 that are bulging and were hotter than others. New to all of this, trying to teach myself how to do this rather than buy a new used MOBO.

The mobo is a Intel D845GEBV2. I tried searching the forum and only found 1 question about a different capacitor on this board.

Here is a picture of them. I see the letters HD Z4 1000 16V and that is it. Does not have the writing on them that other capacitors have to identify them. Can someone help tell me what I should replace the bad ones with?

Thanks
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Old 02-15-2023, 09:20 PM   #60
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Default Re: Post help identifying capacitors here

Nichicon HD 1000uF 16V

Nichicon decided to discontinue a lot of parts, so get then while you can. Nichicon's datasheet doesn't have that value marked as "not recommended for new designs," but Digikey does. Rubycon ZL looks like a decent alternative if they do disappear.

Last edited by lti; 02-15-2023 at 09:27 PM..
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