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Registered Member #964
Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
You might have seen this before, but I still think it's pretty cool. It's probably absolutely useless for the HV made here due to its over-sensitivity, It'll light up due to sky voltage INSIDE (I'm pretty sure the house shields the sky's E-field from the inside..) a house, but only if you toss it into the air so it isn;t just part of the "ground" electrode and not picking up the e-field. It'll pick up someone petting a cat from approx 2 meters and when you're holding it and scuff your feet on the carpet. I like it a lot, it's a ton of fun to see how electrostatic the common world really is.
The original web page
My Device: It is the circuit (omitting antenna resistor, earth-ground) hot-glued between a couple of plastic pieces cut from the walls of an old milk carton. It's sealed around the edges, the "on-off" switch is simply the 9v battery clip, one side "snapped" onto the battery so it could spin around it, and on-off is obtained by putting the other side of the clip in or out of contact with the other battery terminal.
Registered Member #964
Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134
Heh. You ordered parts for 20 of the things? Lol, w/ prices these days, the batteries for them would probably cost more than the parts. You could build all of them and do a "charged object hunt" like it says farther down the page. Great minds do think alike :)
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
I never intended to build 20, its just that at the time 20 probably cost like $2 on digikey, and I figured "What the hell, I'll probably zap a few anyway with various sources of HV I have around here!"
What was neat was hooking a scope up across the LED. If you put the scope on AC mode with a footlong antenna you can pick up all sorts of HF noise, 60Hz mains, etc. But then again you can do that by just attaching a wire to the scope probe...
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Cool circuit
