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| General Electronics Chat This forum is for general chat about electronics, eg: Dont know what a part does? Dont know how to read a circuit? Want to get an opinion? |
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23rd June 2008, 05:22 AM
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How to calculate the value u farad of a dc capacitor?
If a dc voltage generated by a bridge rectifier & dc capacitor is 250vdc & has to be loaded about 3A,what is the u farad of the dc capacitor needed?
How to calculate? Thanks!! |
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23rd June 2008, 05:35 AM
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Is the answer due tomorrow?
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23rd June 2008, 05:40 AM
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I doubt it's a homework question as there isn't enough information to answer it.
What is the minimum voltage that whatever it is supplying will tolerate? Or, how much ripple is allowable? Mike. |
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23rd June 2008, 05:44 AM
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Depends on the ripple suppression required.The smoother the O/P the larger the capacitor.
HINT: The capacitor has to supply the 3 amps for the time between DC pulses.
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A conclusion, is the point reached when you stop thinking. |
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23rd June 2008, 06:14 AM
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Just have a look in the search of this forum as the same question whas answered about 3 a 4 months ago
Robert-Jan |
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23rd June 2008, 04:50 PM
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I copied this from Hero.
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Superman returns.. 
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23rd June 2008, 09:50 PM
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what mean F in equation ?
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There are two major products that came out of Berkeley: LSD and BSD. We don't believe this to be a coincidence. —Jeremy S. Anderson |
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23rd June 2008, 10:44 PM
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F is the frequency coming from the rectifier bridge. It is double the mains frequency so it is 100Hz or 120Hz.
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Uncle $crooge |
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24th June 2008, 01:14 AM
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Quote:
THere is iterative math involved...but I forget it all.
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NO, that picture isn't me so don't bother asking if we can be friends. Last edited by dknguyen; 24th June 2008 at 01:14 AM. |
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24th June 2008, 07:22 AM
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The answer is simple.
The biggest capacitor you can find in your junk box  If it hums then stick a few more in parallel until it stops humming  |
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24th June 2008, 08:57 AM
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Quote:
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What is a joule per second? |
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24th June 2008, 08:47 PM
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I was given the formula for a full wave bridge rectifier of 20'000/(V/I) but as that was in a crappy Italian school where I knew more than some of the teachers so I'd not stake my life on it !
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I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk see also http://www.bigstockphoto.com/account...fid=m2URATYch5 http://www.redbubble.com/people/simonsphotography |
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24th June 2008, 08:55 PM
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Quote:
__________________
I AM the exeption that disproves the rule in many ways but the rules still apply (unfortunately) my site:www.simons-photography.com http://rushdenrotaract.org.uk see also http://www.bigstockphoto.com/account...fid=m2URATYch5 http://www.redbubble.com/people/simonsphotography |
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