ToxicBug wrote:Well, the AC current in the power lines as well as pretty much everywhere else in a house is 60Hz, so its nothing extrordinary to hear the power lines hum. In PCB's and such (like a radio) the frequencies are much, much higher, so its absolutely impossible for a human being to hear them. And wtf would he hear from a car? Its operating on DC current.
It's not a hum for sure. He may be insane, but I assume he knows the difference between a hum and a screechy high-pitched thing Maybe he does have tinnitus? Never thought of that... I've never had it so I don't know how high pitched the ringing is... I'll have to ask him.