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?
My air fryer has a blinking light whet it’s on standby. Well, when the light’s OFF, I can hear a high pitched noise. My partner is 4 years older than me and she can’t hear it ლ(ಠ_ಠლ)
The transformer of my electric shaver makes a similar noise too.