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Old 31st August 2012, 05:55 AM   #71
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hi jay

noise is not a problem with smps because its frequency is far
beyond audio range..i already tested it with my amps

kikodemy
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Old 1st September 2012, 03:17 AM   #72
VA2GXB is offline VA2GXB  Canada
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Location: Montreal QC
Longevity with SMPS is mainly down to electrolytic caps, followed by overtemperature and/or overvoltage.
Derate everything 50%, use polypropylene or ceramic caps...should be good .

I work in SMPS design - electrolytics have two things...cost and capacitance - a very good ratio between both...sadly, lifetime sucks. 10,000h is not much versus a transformer. That said, that's at 105C in the case of the KXG (United/Nippon Chemicon) series. Keep your cap at 25˚C and you're laughing. For many years. Many.

Last edited by VA2GXB; 1st September 2012 at 03:23 AM.
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Old 1st September 2012, 04:04 AM   #73
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by kikodemy View Post
hi jay

noise is not a problem with smps because its frequency is far
beyond audio range..i already tested it with my amps
Tested/compared it with non-SMPS power supply?

I had a big SMPS power supply costing hundreds of USD made by Philips. I just destroyed it a week ago because it took up too much space
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