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Old 28th February 2013, 04:47 AM   #1
twu is offline twu  Hong Kong
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Question Can one hear a switching power supply?

I am DIYing a headphone amp with a LDO regulator which has lower PSRR than regular regulators, can it effectively filter out the broadband noise generated by the switching P/S?
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Old 28th February 2013, 05:15 AM   #2
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What noise?
Can you hear ultra sonic?
If you can hear the SMPS, you must have something seriously wrong with your circuit.
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Old 28th February 2013, 05:41 AM   #3
jcdrisc is offline jcdrisc  Australia
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I dont see why a headphone amp would make a switching ps economical to use.
Yes you CAN hear a SPS. I have an LED globe which makes so much EMI (either conducted or radiated) it make AM radio reception practically impossible.
Its a little discussed topic but makes the argument for retaining incandescent globes acceptable IMHO.
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Old 28th February 2013, 09:47 AM   #4
canvas is offline canvas  Taiwan
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Quote:
Originally Posted by twu View Post
I am DIYing a headphone amp with a LDO regulator which has lower PSRR than regular regulators, can it effectively filter out the broadband noise generated by the switching P/S?
I think LDO will help, but not much. I posted similar question before, I remember the answer is to use LC or beads after the LDO.

Last edited by canvas; 28th February 2013 at 09:56 AM.
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Old 28th February 2013, 01:23 PM   #5
marce is offline marce  United Kingdom
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If it is done right NO.
Quote:
Yes you CAN hear a SPS. I have an LED globe which makes so much EMI (either conducted or radiated) it make AM radio reception practically impossible.
Its a little discussed topic but makes the argument for retaining incandescent globes acceptable IMHO.
I presume this is a little chhepp thing, that by the sounds of it has not been through any EMC testing, so you cannot use it as a global example of SMPS and SMPS designs.
I have done a board with two SMPS's inthe actual headphone earshell, with some analogue circuitry, it is silent.
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Old 28th February 2013, 02:24 PM   #6
JMFahey is offline JMFahey  Argentina
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Quote:
Can one hear a switching power supply?
Of course you can.
As an example, I can hear TV flybacks and most flash units.
By the way, the two earliest and most used SMPS over the whole Earth surface.
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Old 28th February 2013, 02:32 PM   #7
SY is offline SY  United States
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Quote:
Originally Posted by JMFahey View Post
Of course you can.
As an example, I can hear TV flybacks...
Back in the '60s and '70s, those drove me crazy. I hated the noise. I can't hear them any more, so my assumption is that they've improved the technology.
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Old 28th February 2013, 02:43 PM   #8
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by marce View Post
it is silent.
I believe it takes experienced listeners to "hear" SMPS problems. In my experience, many times I can "see" the problem only after direct comparison with conventional power supply.

Lately I wonder, why my laptop sound is so terrible (I mean really bad). May be if the power supply is conventional it wouldn't be that bad.
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Old 28th February 2013, 02:44 PM   #9
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Sy,
I often wonder while I am sitting at this computer is it tinnitus or do I really hear a high frequency background noise from the computer fan? I guess I can just shut it off and see!
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Old 28th February 2013, 03:20 PM   #10
marce is offline marce  United Kingdom
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Quote:
As an example, I can hear TV flybacks and most flash units.
By the way, the two earliest and most used SMPS over the whole Earth surface.
Not the best examples, as you've said the earliest. TV's not that many CRTs these days, and you wouldn't use the PSU out of a flash for audio.
Done correctly SMPS's are quiet in the real world and are in numerous products, but I forget they are the devils design
Oh my new flashguns are silent, no whine when they are re-charging! Must be broken
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