Dominique GEORGES
Posts: 3
Joined: Mon Nov 16, 2020 6:38 pm

Noisy Raspberry (19300 Hz sound emission)

Mon Nov 16, 2020 6:48 pm

Hi,

I have 2 Raspberry 4, using passive thermal protection.

I had headache and did not understood why.
Using a decibel meter with frequency monitoring, I discovered that both of them where generating high frequency sound (noise) signal (between 19.200 and 19.350 hz).

I taught the first one was dying, I booted the second one and .. same issue.

At boot time, signal is there +/- 40 db, which is not low.

Powering it off stops immediately the generated signal/sound.

Is that a "normal" behaviour ?

Thanks i advance.
Kr,

Dom

ejolson
Posts: 6382
Joined: Tue Mar 18, 2014 11:47 am

Re: Noisy Raspberry (19300 Hz sound emission)

Tue Nov 17, 2020 12:57 am

Dominique GEORGES wrote:
Mon Nov 16, 2020 6:48 pm
Hi,

I have 2 Raspberry 4, using passive thermal protection.

I had headache and did not understood why.
Using a decibel meter with frequency monitoring, I discovered that both of them where generating high frequency sound (noise) signal (between 19.200 and 19.350 hz).

I taught the first one was dying, I booted the second one and .. same issue.

At boot time, signal is there +/- 40 db, which is not low.

Powering it off stops immediately the generated signal/sound.

Is that a "normal" behaviour ?

Thanks i advance.
Kr,

Dom
Thanks for posting. This seems like it could be a problem, not only for people with good hearing but for various pets that might be in the house. I wonder if the Pi 400 is also affected.

Dominique GEORGES
Posts: 3
Joined: Mon Nov 16, 2020 6:38 pm

Re: Noisy Raspberry (19300 Hz sound emission)

Tue Nov 17, 2020 9:41 am

I tried without any passive thermal protection (during a few seconds ;) )

Just powering it generates immediately sound signal : 19.230 -> 19.340 Hz

What strange is, my third Raspberry 4 is not suffering of that issue.

I presume the signal frequency may help expert to pointout the source.

It starts directly at power ON.

Fortunately, I just have a cat an no dog.
But I presume my cat is also suffering from that issue.

Please help my .. cat :)

PS : These Raspberry are running HomeAssistant, and have issue

PS : All 3 are Raspberry Pi 4B 4GB

Kind regards,
Dom

jdb
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 2508
Joined: Thu Jul 11, 2013 2:37 pm

Re: Noisy Raspberry (19300 Hz sound emission)

Tue Nov 17, 2020 12:56 pm

Are you using the same power supply between the noisy boards and the "quiet" board?
Rockets are loud.
https://astro-pi.org

LTolledo
Posts: 4556
Joined: Sat Mar 17, 2018 7:29 am
Location: Anime Heartland

Re: Noisy Raspberry (19300 Hz sound emission)

Tue Nov 17, 2020 1:02 pm

can you share an image of the display of that "decibel meter with frequency monitoring" showing the "suspected value"

is the data display plotted against time?
"Don't come to me with 'issues' for I don't know how to deal with those
Come to me with 'problems' and I'll help you find solutions"

Some people be like:
"Help me! Am drowning! But dont you dare touch me nor come near me!"

Dominique GEORGES
Posts: 3
Joined: Mon Nov 16, 2020 6:38 pm

Re: Noisy Raspberry (19300 Hz sound emission)

Tue Nov 17, 2020 2:28 pm

jdb wrote:
Tue Nov 17, 2020 12:56 pm
Are you using the same power supply between the noisy boards and the "quiet" board?
Yes, indeed.

And, using another powersupply modifies the signal strength, and witdth !

Thus powersupply is part of the root cause.
Rapberry PI-B 4G - Hautes fréquences-min.jpg
High frequencies 19.300 Hz
Rapberry PI-B 4G - Hautes fréquences-min.jpg (194.09 KiB) Viewed 113 times
Kr,
Dom

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