minus-squaresnrkl@lemmy.sdf.orgtoAsklemmy@lemmy.ml•Do you often hear the ringing of switching power supplies and devices when you are in a quiet space?linkfedilinkarrow-up0·2 years agoYes. 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… linkfedilink
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…