Wouldn't your weapon also pull the nails out of walls and thereby
collapse all the buildings?
On 11/7/2019 2:00 PM, Steve Jones wrote:
this got me when i was kid and built a wire coil magnetizer. I burned
up my model train power supply. the little details like enamel coating
are what get you. I spent so many hours perfectly winding that coil
too. I can never have that time back. i think that may be the point in
life that i became jaded. had that not happened, i would probably have
grown the process to the degree that i was able to build my emp weapon
that displaces the iron atoms in the human body, shredding
humans where they stand and not damaging structures. The world would
have bowed to my will..... those tiny details ruin everything
On Sun, Nov 3, 2019 at 1:24 PM Ken Hohhof <af...@kwisp.com
<mailto:af...@kwisp.com>> wrote:
If Radio Shack still existed, you could pick up a spool of “magnet
wire”, thin stuff with enamel insulation. 26 or even 32 AWG should
be fine for lighting an LED. Mount that cardboard tube on a lathe
or drill and put a whole bunch of turns on it.
Faraday’s law says voltage should be proportional to number of
turns times rate of change of magnetic flux. Size of cardboard
tube doesn’t explicitly show up in that equation, but I think Bill
is right, because if you visualize the flux lines from the
magnets, they would only factor into the equation if they loop
around the coil of wire. If the coil is too wide or too long,
some of the flux lines will stay inside the coil or will cut
through it rather than looping around the ends. The too long
problem is not as big of a problem because it just means the
dropping magnets will include voltage for a longer time interval.
*From:*AF <af-boun...@af.afmug.com
<mailto:af-boun...@af.afmug.com>> *On Behalf Of *Bill Prince
*Sent:* Sunday, November 3, 2019 12:38 PM
*To:* af@af.afmug.com <mailto:af@af.afmug.com>
*Subject:* Re: [AFMUG] OT: Induction coil voltage
The diameter of the tube and the size of the magnets will also
affect how much voltage you get out of the thing. Try to minimize
the air gap around the slug/magnets as much as possible. Use a
smaller diameter tube or a larger diameter slug/magnets.
bp
<part15sbs{at}gmail{dot}com>
On 11/3/2019 9:51 AM, Adam Moffett wrote:
I'd bet I have 20-30 turns of 16ga wire....that's just what I
happened to find first. I could tear apart some CAT5 and use
the 24ga inside so I can get more turns in the same area. Or
I can find something with a transformer inside and unwind the
super skinny wire on it. I just don't know to what extent I
need to go to make this thing work.
And yeah it's not obvious in the picture I sent, but you're
supposed to connect the two LED's together short leg to long
leg so that one of them lights up when you drop the magnet
North first and the other lights up when you drop it South first.
I'd wondered about the length of the pulse too. It's a cheapo
digital multimeter. It does not read the same on each drop of
the magnet. When I say it read 30mV that's just the highest
number I saw after several drops.
-Adam
On 11/3/2019 12:40 PM, Ken Hohhof wrote:
I would think yes, although it seems the electrical pulse
will be very brief and I’m not sure you’ll be able to
measure it with a meter. Also have you determined the
polarity of the DC generated or tried hooking up the LEDs
both directions?
In any case, I’d think wrapping the entire length of the
cardboard tube with wire would make the LEDs light up for
a longer time and be more visible.
How many turns do you have on it now?
*From:* AF <af-boun...@af.afmug.com>
<mailto:af-boun...@af.afmug.com> *On Behalf Of *Adam Moffett
*Sent:* Sunday, November 3, 2019 11:20 AM
*To:* af@af.afmug.com <mailto:af@af.afmug.com>
*Subject:* [AFMUG] OT: Induction coil voltage
I wanted to do this science experiment with the kids. My
problem is my LED's don't light up. It's from a
discontinued textbook. Apparently they sold a kit with
the materials for all the projects, but that's no longer
available so I'm scrounging in the garage.
I put a volt meter on the rig and I was only getting 6mV
when I dropped the magnet. I doubled the number of coils
on the tube and then doubled the number of neodymium
magnets and I'm getting closer to 30mV now, but I need
closer to 2V to light up an LED, so I'm wondering what
would increase the voltage by two orders of magnitude. Is
it based on the number of turns in the coil?
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