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Old 04-20-2012, 05:18 PM
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s0lid s0lid is offline
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Default Lets talk about capacitors in this hobby.

The main part of voltage filtering in this hobby and i see ppl adding caps to the zombies and OC'd cards.
Just got some main things i'd like to get opinions from and just general discussion what are good practices.
1. Capacitance vs ESR
And 2. how low you can go with the voltage rating on the capacitor.

1. So ok, when it comes to ESR it got to be low and UCC's NPCAP-PSC goes pretty much low as it gets on leaded caps low voltage caps (6-11mOhm) and Panasonic SP-Cap GX (3mOhm) on SMD side. In the usual configuration capacitors are in paraller and caps are added for greater capacitance, so i'd like to know how the ESR behaves when capacitors are added. I don't have LCR/ESR meter in hand so i cant check...

2. Normal effective voltage range in this hobby is around 1.2-2.3V. So what would be the sweet spot for rated voltage? 2V? 2.5V? 4V? 6.3V? For example those SP-Cap GXs are rated 2V and 470uF max, would these work well in below 2V range? Also the 1000uF 4V PSC seems to be in sweet spot, 6.64A Ripple Current and 6mOhm ESR.

Just looking for some input as i'm goin to order some goodies from digikey

On the list:
399-5620-1-ND x 25
PCE5028CT-ND x 16
565-3225-ND x 20
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Old 04-20-2012, 05:50 PM
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my faves are 5mOhms 2.5v solid polymers from oscon
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Old 04-21-2012, 03:01 AM
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why would you buy all this stuff?
don't you have a broken mainboard at home?
i always desolder most of the usefull parts form my dead mainboards with hotair gun on the backside of the mainboard
i mean tons of those ceramic caps are on mainboards and gfx realy easy to desolder with hotair gun and a screw driver or knife
also these polymer caps on mainboard are the best that you can get
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Old 04-21-2012, 05:22 AM
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used caps are usually degraded(capacitance and esr). you can get 10caps for 5$. http://www.ebay.com/itm/320678305284...84.m1438.l2649

some motherboard manufacturers dont use the best stuff. they get cheaper stuff but of course "japanese solid capacitors" its true but its not the best.
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Old 04-21-2012, 05:56 AM
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What Hondacity said and I don't have any boards where were I could snatch some proper polymers. So I rather buy new ones

Also these seem rather nice. Nichicon LE 1500uF 2.5V Polymers, 7.3A ripple and 5mOhm ESR.
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Old 05-01-2012, 02:02 AM
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ok qucik qhestion what is better alumiun caps or polymer caps??
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Old 05-01-2012, 03:27 AM
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Depends on the usage but in this hobby, low esr polymers
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Old 05-01-2012, 08:30 AM
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and the uf? around 1500 correct?
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Old 05-01-2012, 08:37 AM
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1500uF are 10mmx13mm
820uF are 8mmx9mm

I prefer the tighter va* lol

I prefer smaller ones as they are slightly cheaper and smaller=easier for stacking but thats just for me.
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