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Changing from electrolytic capacitors to solid polymer capacitors.  

post #1 of 21
Thread Starter 
Hi there guys,

I've got two NF3 250gb boards here which need the caps changing on them.

Since they need to be changed, I though that maybe putting solid caps on them might help a little tiny bit as it should reduce the ripple going to the cpu.

What I need to know is whether or not it will be a case of finding the exact same rated capacitor in polymer form or whether it was a bit more complicated than that.

The caps that need changing are :

6 x 6.3v 3300 uF

4 x 16v 1500 uF

1 x 10v 1000 uF

Any help would be greatly appreciated.

Thanks for your time.
post #2 of 21
as long as they are rated the same voltage or higher, and the same uF, they should work just as well. They seem to have a longer life than electrolytics, and can handle high ripple currents. Just make sure you get low ESR types. http://www.capacitorlab.com/capacitor-types-polymer/ <---this may give you more information, :-)
post #3 of 21
Thread Starter 
Problem I'm having though is that I can't find anything close to the same specs for a polymer capacitor :L

Maybe it can't be done for this board??
post #4 of 21
frown.gif After doing a ton of hunting on the web - it does seem they are almost impossible to get in the values you need. It is easier to get smaller values, but that would mean more caps would be needed to make up the values, and I don't know if the board has space/solder pads for any more caps.

I did find these - http://www.ebay.co.uk/itm/2-X-RARE-SANYO-OS-CON-2200uF-6-3V-SOLID-CAPACITOR-/261104395484?pt=US_Amplifier_Parts_Components&hash=item3ccb08e4dc

but you would need 9 in circuit to make up the same value as the 3300uf caps......assuming the 3300 caps are all on the same rail.

The 10V 1000uf - http://www.ebay.co.uk/itm/2-Sanyo-SEPF-16V-1000UF-Small-Size-High-Voltage-OS-CON-Aluminum-solid-Capacitor-/300820295550?pt=LH_DefaultDomain_0&hash=item460a496f7e

That would do - and has extra headroom on the voltage.

I couldn't find any 1500's at 16V - but you could use the 1000's if there's room for two extra.

Otherwise I think its a case of going for good quality electrolytics - I don't think polymers are quite there yet in terms of capacitance value.

PS - I forgot to add, I've not checked the lead spacing or size of the caps either - it is worth considering the physical size of the caps too, and if they'll fit in the space provided on the board.
Edited by latelesley - 11/30/12 at 10:12pm
post #5 of 21
Thread Starter 
cheers anyway dude, just going to go with high quality electrolytic capacitors smile.gif
post #6 of 21
Here's the closest I could find. The 4v might work to replace the 6.3v caps, depending on what the 6.3v caps you are looking at are for. If they're CPU voltage, they should be fine.

http://www.digikey.com/product-detail/en/TLN6108M010R0055/478-5633-1-ND/2077288

http://www.digikey.com/product-detail/en/TLN6338M004R0055/478-5635-6-ND/2077322
    
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post #7 of 21

you wont find same uf ratings etc.. as polymer caps discharge like 100x faster.. 

 

*my advice would be look for the correct voltage you need.. [like Pizza said - 4v are sufficient for CPU and RAM circuits.. as thats already 3x over your nominal voltage].. and try to find uf ratings that are close to 1/3 or 1/2 of the original cap value.

post #8 of 21
As an EE this is just all around a weird idea.
    
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post #9 of 21
Quote:
Originally Posted by killabytes View Post

As an EE this is just all around a weird idea.

 

 maybe weird.. but not a bad idea at all. There is nothing wrong with beefing up capacitance.. and so long as you have enough, and take into account your 'uf' needs for filtering.. you should improve supply and ripple by a good bit.

 

*Plenty of modders do similar things for GPUs as well..  EE or not .. rolleyes.gif

post #10 of 21
Quote:
Originally Posted by CL3P20 View Post

 maybe weird.. but not a bad idea at all. There is nothing wrong with beefing up capacitance.. and so long as you have enough, and take into account your 'uf' needs for filtering.. you should improve supply and ripple by a good bit.

*Plenty of modders do similar things for GPUs as well..  EE or not .. rolleyes.gif

It's called charge not "uf". It's measure in Farads, not uf. U or μ is actually the SI prefix for micro.

Also, polymer capacitors are electrolytic capacitors; just a different kind. wink.gif

I'm not saying that switching them is weird or wrong. It's the terms and knowledge in here. smile.gif
    
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