this post was submitted on 17 Feb 2024
398 points (98.1% liked)

Asklemmy

44149 readers
1392 users here now

A loosely moderated place to ask open-ended questions

Search asklemmy πŸ”

If your post meets the following criteria, it's welcome here!

  1. Open-ended question
  2. Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
  3. Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
  4. Not ad nauseam inducing: please make sure it is a question that would be new to most members
  5. An actual topic of discussion

Looking for support?

Looking for a community?

~Icon~ ~by~ ~@Double_A@discuss.tchncs.de~

founded 5 years ago
MODERATORS
 

I'm curious, how many people are aware of these sounds. I have designed, etched, and built my own switching power supplies along with winding my own transformers. I am aware of the source of the noise. So, does anyone else hear these high frequency sounds regularly?

you are viewing a single comment's thread
view the rest of the comments
[–] snrkl@lemmy.sdf.org 23 points 10 months ago (1 children)

Yes. I can hear to about 18kHz, so cheap USB chargers are no longer allowed in my house....

Worse, the EV chargers I used to work with had PEMs switching at 10kHz for the US UL variants. EVERYONE could hear those!!

Test your hearing range with this if you want...

https://www.szynalski.com/tone-generator/

I used the 10kHz tone to annoy the eng dept in the office till they changed the PEM switching freq to 20kHz....