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Old 13th March 2009, 01:53 AM   #11
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this article a huge difference, back in the day (1980), and still does -

http://www.reliablecapacitors.com/pickcap.htm


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Old 13th March 2009, 02:02 AM   #12
Deofol is offline Deofol  United States
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Well, looking again, and to be fair. The Sony ES has Nichicon Gold Tune 18,000uf caps per line.

Might have to steal those.
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Old 13th March 2009, 03:06 AM   #13
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Default Re: Re: Re: PSU Reservoir Capacitors (Single large vs Multiple small)

Quote:
Originally posted by infinia


parts count is the real killer of MTBF
Not necessarily. You have to look at the FITS (failures per 10^9 device hours) for each specific device multiplied by the quantity. For the entire system,

MTBF = 1/ sum[ (FITS1 * # device1) + (FITS2 * #device2) + ...]

It is quite possible that multiple devices of high reliability will have a better aggregate reliability than a single device of merely average reliability. Also, the failure rate of just a couple of parts may dominate the calculation, making the quantity of other parts irrelevant.
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Old 13th March 2009, 03:29 AM   #14
infinia is offline infinia  United States
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yea yer probably right. I think I was mostably hungover that day in class. IMO all the MTBF calculations assumes the designers were perfect in all design areas. Not usually the case me thinks.
Do the reliability guys get a scorecard for after the fact product lifecycle reports from the field checking their calc's for accuraccy?
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Old 13th March 2009, 04:05 AM   #15
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Old 13th March 2009, 05:03 AM   #16
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Quote:
Originally posted by infinia
yea yer probably right. I think I was mostably hungover that day in class.
college days...

Quote:
[i]
IMO all the MTBF calculations assumes the designers were perfect in all design areas. Not usually the case me thinks.
Do the reliability guys get a scorecard for after the fact product lifecycle reports from the field checking their calc's for accuraccy? [/B]
Exactly. operating the components out of spec or not allowing for de-rating can have a big impact on reliability. The MTBF numbers are always just a "check off" item on the requirements document, so the reliability guy turns the crank on the BOM to come up with a number that exceeds the requirement and that's the last anyone thinks about it, unless you work for Boeing or NASA or a medical equipment manufacturer.
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