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Old 27th May 2012, 08:17 AM   #1
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Default smps switching frequency and noise

hi
arjen helder ebay lists a smps power supply
Switchmode Power Supply 11-14 volts ADJ 3.5 A power max | eBay

the description says that the switching freq. is 50khz so noise is not an issue.
for t-amp, will this smps power supply give good results or atleast comparable with linear supply?
or do u prefer linear supply as a better option?
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Old 29th May 2012, 08:02 PM   #2
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50khz noise can and will get amplified by a tube amp you just won't hear it. It will rob power and can make the output tranny run hotter. Like a little AM radio station... It can and probably should be filtered.


Linear supply is heavier and less efficient but bullet proof and will probably never break where a smps can fail at any time for no reason at all but is well regulated lightweight and low impedance.

Last edited by Austin Translation; 29th May 2012 at 08:04 PM.
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Old 30th May 2012, 01:39 AM   #3
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i will not be bothered about heat issues, as long as it can provide clean power. so with an external regulator, can this 50khz noise from smps be removed? in that case can i safely assume that the clean power i get from such a smps is as noise free as i would get from a well designed linear supply?
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Old 30th May 2012, 01:57 AM   #4
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The audibility of the noise per se is of less consequence than the effects of non-linearities caused by premature conduction of PN junctions AND the way in which smps noise can effect clock and comparator operation. Analog Devices has a paper on this.
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Old 30th May 2012, 05:36 AM   #5
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Quote:
Originally Posted by soundnovice View Post
i will not be bothered about heat issues, as long as it can provide clean power. so with an external regulator, can this 50khz noise from smps be removed? in that case can i safely assume that the clean power i get from such a smps is as noise free as i would get from a well designed linear supply?
You could probably suppress it to a very low level, but fully removing it seems unlikely. Not sure that a lineair voltage regulator will do this very well. My money would be on a good low pass filter.
Perform a search on this forum, you might find useful threads dealing with this issue.
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