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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> *On Behalf Of *Adam
Moffett
*Sent:* Sunday, November 3, 2019 11:20 AM
*To:* 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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