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'[OT] Has anyone made a 'homemade' transformer?'
2000\05\17@224440 by rad0

picon face
When you make a transformer, do you have to
use insulated wire??  I was looking at a transformer
the other day and it seemed to look like 'bare' copper
wire.  Is it insulated with some sort of clear spray, or
is it really bare copper wire.

I want to make an electro-magnet.

Thanks in advance.

2000\05\17@225244 by Samuel Ace Winchenbach

flavicon
face
Ahhh this is my realm :)   What you saw there was "enamel coated magnet
wire".  This wire is used for a number of reasons...  first it reduces the
size, seeing that insulation is bulky.  Making it smaller it allows more
wraps, closer to the core (better inductance)   Plus, the enamel coating is
relatively heat resistant.  Plastic insulation can melt quite easily.  So
the answer is YES!!!  you need insulation, without the current will not flow
around the coil... it would flow across the wraps.

Hope this helps,
Sam


{Original Message removed}

2000\05\17@225504 by l.allen

picon face
rad0 wrote
> When you make a transformer, do you have to
> use insulated wire??  I was looking at a transformer
> the other day and it seemed to look like 'bare' copper
> wire.  Is it insulated with some sort of clear spray, or
> is it really bare copper wire.
>
> I want to make an electro-magnet.
>
> Thanks in advance.

Yes
The wire must be insulated, the wire you saw would
probably have some sort of clear enamel on it.

Uninsulated wire will simply short out the turns, resulting
in excess current and no significant flux being generated
in the core.


_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

http://www.psych.auckland.ac.nz

_____________________________

2000\05\17@225706 by Chris Eddy

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face
If you use wire with no insulation, you will have a perfect
Electro-Weight.

Go to radio shack and get the assortment of wire, you will have a ball
with it.  Opps.  You will have fun with it.

Chris Eddy

rad0 wrote:

>  When you make a transformer, do you have to
>  use insulated wire??  I was looking at a transformer
>  the other day and it seemed to look like 'bare' copper
>  wire.  Is it insulated with some sort of clear spray, or
>  is it really bare copper wire.

2000\05\17@230529 by Samuel Ace Winchenbach

flavicon
face
>If you use wire with no insulation, you will have a perfect
>Electro-Weight.


Hahah... awesome.. electo-weight.

2000\05\18@004312 by rad0

picon face
alright, that's what I thought, just wanted
to make sure before I burned the house
down. ;-)

sorry for duplicates I was getting messages
returned


{Original Message removed}

2000\05\18@102312 by Harold Hallikainen

picon face
On Thu, 18 May 2000 14:51:59 +1200 Lance Allen <spam_OUTl.allenTakeThisOuTspamAUCKLAND.AC.NZ>
writes:
{Quote hidden}

       I heard that Morse's first telegraph was built with uninsulated wire in
the electromagnet. Didn't work. Someone advised him to use insulated
wire.

Harold

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2000\05\23@190526 by hgraf

picon face
> When you make a transformer, do you have to
> use insulated wire??  I was looking at a transformer
> the other day and it seemed to look like 'bare' copper
> wire.  Is it insulated with some sort of clear spray, or
> is it really bare copper wire.

       The windings are most definitely insulated, the wire used is actually
called "magnet wire". Usually this type of wire has a very thin layer of
insulation, practically painted on.

> I want to make an electro-magnet.

       A very common first experiment with electricity, I doubt you will not find
a person here who hasn't done that at least once in their life. TTYL


'[OT] Has anyone made a 'homemade' transformer?'
2000\06\07@002425 by rad0
picon face
can this enamel-coated wire be purchased
'ready-made', or is this a manufacturing process??
thanks

if so, where can I get some?

----- Original Message -----
From: "Samuel Ace Winchenbach" <.....swinchenKILLspamspam@spam@EECE.MAINE.EDU>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Wednesday, May 17, 2000 9:50 PM
Subject: Re: [OT] Has anyone made a 'homemade' transformer?


> Ahhh this is my realm :)   What you saw there was "enamel coated magnet
> wire".  This wire is used for a number of reasons...  first it reduces the
> size, seeing that insulation is bulky.  Making it smaller it allows more
> wraps, closer to the core (better inductance)   Plus, the enamel coating
is
> relatively heat resistant.  Plastic insulation can melt quite easily.  So
> the answer is YES!!!  you need insulation, without the current will not
flow
> around the coil... it would flow across the wraps.
>
> Hope this helps,
> Sam
>
>
> {Original Message removed}

2000\06\07@010712 by Dale Botkin

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face
On Tue, 6 Jun 2000, rad0 wrote:

> can this enamel-coated wire be purchased
> 'ready-made', or is this a manufacturing process??
> thanks

Ready made and quite common, in fact.

> if so, where can I get some?

Your neighborhood Radio Shack (I see you posted from home.com, so I assume
you're in the US).  $3.99 for #278-1345, a set of 3 spools totalling 315'.
200 of that is 30-ga. which will make a nice electromagnet.  You should be
able to find enamel coated solid wire at any reasonably well stocked
electronics supplier...  or even Radio Shack.

http://www.radioshack.com/ProductCatalog/ProductDetail/Index/1,2098,CTLG_1_2781345,00.html

Dale
---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

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