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Unread 10-31-2017, 05:37 PM
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Screaming VRM !?!?

Has anyone experienced obnoxiously loud noises coming out of their Voltage Regulator Modules? When a single 12 volt led light ring is plugged into the VRM, either 2A or 500mA, it (the VRM) emits a painful high frequency whistle. Even weirder, when other 12v loads are plugged in (i.e. Radio), the noise stops.

Any ideas?
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Unread 10-31-2017, 05:47 PM
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Re: Screaming VRM !?!?

This sounds like coil whine. I just want to confirm:

Quote:
Even weirder, when other 12v loads are plugged in (i.e. Radio), the noise stops.
Do you mean that plugging in the radio WHILE keeping the LED ring plugged in eliminates the noise? Or do you take the LED ring out and then put the radio in?

Also, does the LED ring light up when you plug it in? If not, I would suspect a short circuit in the LED ring. Try testing the resistance across the LED ring with a multimeter. In the forward direction, it should be in the order of 100-1000 ohms I think. In the reverse direction it should be very large (megaohms). If that is not the case, you probably have a bad LED ring, potentially a short.
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Unread 10-31-2017, 06:18 PM
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Re: Screaming VRM !?!?

I have this same problem. Even when it is not powering anything it whines. It started suddenly too. Gets pretty annoying at 1 am.
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Unread 10-31-2017, 07:24 PM
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Re: Screaming VRM !?!?

I believe that is a normal and expected behavior.
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Unread 10-31-2017, 07:33 PM
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Re: Screaming VRM !?!?

Quote:
Originally Posted by cgmv123 View Post
I believe that is a normal and expected behavior.
Can't tell if you are being sarcastic, but we do not have this problem.
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Unread 10-31-2017, 07:55 PM
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Re: Screaming VRM !?!?

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Originally Posted by cgmv123 View Post
I believe that is a normal and expected behavior.
This is not normal expected behavior from a VRM.
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Unread 10-31-2017, 09:03 PM
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Re: Screaming VRM !?!?

Our VRM does this too, not sure why. I took a video of it happening:

https://www.youtube.com/watch?v=Rbnn...ature=youtu.be

Does anyone know how to fix this?
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Unread 10-31-2017, 09:07 PM
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Re: Screaming VRM !?!?

You can get a high pitched whine from frequency switching devices if the switching frequency is low enough to be audible (20 to 20,000 Hz), especially at low loads.
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Last edited by Mark McLeod : 10-31-2017 at 10:23 PM.
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Unread 11-01-2017, 12:27 AM
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Re: Screaming VRM !?!?

Quote:
Originally Posted by ns3517 View Post
This is not normal expected behavior from a VRM.
Errr... yes it is. The old blue PDBs will do it too with the right load.
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Unread 11-01-2017, 07:41 AM
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Re: Screaming VRM !?!?

Quote:
Originally Posted by Tom Line View Post
Errr... yes it is. The old blue PDBs will do it too with the right load.
A single ring light alone will cause the VRM to emit a high frequency noise?
We had a large ring light light last year and did not get a noise like this.

Last edited by ns3517 : 11-01-2017 at 07:47 AM.
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Unread 11-01-2017, 08:42 AM
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Re: Screaming VRM !?!?

Quote:
Originally Posted by ns3517 View Post
A single ring light alone will cause the VRM to emit a high frequency noise?
We had a large ring light light last year and did not get a noise like this.
I think there are two different "expected" being thrown around here. Correct me if I'm wrong but the expected you're using seems to be in reference to the intended behavior of the device. The expected that those who are saying coil whine can be expected are not using it in this way. What they are saying is that although not intended, you have to expect to some extent that coil whine could be present in the board. I would also have to agree with cgmv123 on the statement that coil whine is a normal behavior. Take for instance the GTX 970. At launch A huge number of units have massive issues with coil whine, to the point where is was actually quite normal. After a little bit the issues stopped happening because Nvidia stopped selling its reference models and board partners started tweaking mainly power delivery stuff in the firmware which made the cards sold after have much less coil whine. This issue was most prevalent among people who bought lesser quality power supplies because lesser quality power can be a large factor of coil whine.
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Unread 11-01-2017, 09:35 AM
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Re: Screaming VRM !?!?

Quote:
Originally Posted by FrisbeeFunTime View Post
I think there are two different "expected" being thrown around here. Correct me if I'm wrong but the expected you're using seems to be in reference to the intended behavior of the device. The expected that those who are saying coil whine can be expected are not using it in this way. What they are saying is that although not intended, you have to expect to some extent that coil whine could be present in the board. I would also have to agree with cgmv123 on the statement that coil whine is a normal behavior. Take for instance the GTX 970. At launch A huge number of units have massive issues with coil whine, to the point where is was actually quite normal. After a little bit the issues stopped happening because Nvidia stopped selling its reference models and board partners started tweaking mainly power delivery stuff in the firmware which made the cards sold after have much less coil whine. This issue was most prevalent among people who bought lesser quality power supplies because lesser quality power can be a large factor of coil whine.
This helps explain my view and makes more sense.
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Unread 11-01-2017, 09:38 AM
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Re: Screaming VRM !?!?

Quote:
Originally Posted by Tom Line View Post
Errr... yes it is. The old blue PDBs will do it too with the right load.
My team just found one of these "Blue PDBs" last night putting together an off season project.
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Unread 11-01-2017, 03:52 PM
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Re: Screaming VRM !?!?

Does it whistle when you power it up? We always joked about it because everyone noticed it standing near the old bots.
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Unread 11-01-2017, 05:32 PM
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Re: Screaming VRM !?!?

Just be glad that you're young enough to still hear it.

Take it from us old guys protect your hearing always.
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