LED "hot spots"

[KRSESQ]

My friend Steve used to find great amusement in bouncing his TV remote control signal off of his cocker spaniel, Tara.

Obviously it didn't take much to amuse Steve.

Kevin

[Dr Mordrid]

Sounds like our middle son Chris.

Chris and his wife Beth have a 5 year old & she says it's more like she has two 5 year olds

[Nowhere]

Y'know, they always say that, but nobody has yet built a fluorescent light that doesn't make my brain hurt. I know those are at a lower frequency, right? But honestly, these things ALWAYS end up wigging someone's nervous system out.

I'm just being pessimistic. I understand, rationally, that we're talking about apples and pianos.

Faulty ones, yeah. AFAIK the ones that work properly have usually 2 times the frequency of electrical grid in given place...so that would mean 120Hz for you.

Accidentally - I've never heard somebody complaining about flicker on 100 or 120Hz monitor...but 50 or 60Hz does dive headaches.

[Nowhere]

Dog whistles are in the 20-30kHz range, well below the MHz range Brian mentioned.

They're basically just above the (normal, non-GURM ) human hearing range.

- Steve

Reminds me, I have to check at what frequency bats common during summer in my city emit signals. I definatelly can hear them...irritating a bit - when they're very near, it doesn't become loud at any point (in the sense of "loudness" it always barely registers), but it does become almost painfull.