Joule Thief

[hartiberlin]

Hi all,

Just thought I might throw my ore in here and pass you all an idea I just had, and maybe it will settle the forum down a bit.

Has anyone ever made a Joule Thief using a copper wire and a Iron (uninsulated) wire as the bifilar windings?

Has anyone used just iron wire as the secondary windings? (use insulated garden tie wire)

I was thinking the extra iron of the iron wire should add to the magnetic fields produced in the toroid's, thereby making a higher magnetic field when energised, upon collapsing, it should give out a higher energy!

If you wind "over" the top of a previous bifilar winding, then you will need to insulate the layer beneath it with tape to prevent short circuits.

jim

2599 = just one of my coils of tiny iron insulated wire.

If you build a coil out of iron wire,
it will have NO inductive Kickback BackEMF !

Just try to pulse it with square waves or pulse waves
and you will see it.

It seems the magnetic field of an iron coil is different
than a copper coil.

Also you can move the heat from the pulsing via a permanent magnet
on the coil to a different area of the coil.

[electricme]

@ hartiberlin,

Hello Stefan and thanks.
Up to a point, if you as you say a single coil out of iron wire, this is why stubblefield coils are wound using copper and iron bifilar wires.

If you build a coil out of iron wire,
it will have NO inductive Kickback BackEMF !

Just try to pulse it with square waves or pulse waves
and you will see it.

It seems the magnetic field of an iron coil is different
than a copper coil.

Also you can move the heat from the pulsing via a permanent magnet
on the coil to a different area of the coil.

I have pulced a transformer with square waves which produces heat, (which I want) to fit into a oil collum heater, but you need to connect 2 iron cored transformers primeries in series or the heat is runaway and the cores fry.

BTW, lasersaber is getting success running a small electricmotor only by his stubblefield coil, there is no other electrical power supply.
Click here to see a youtube video of it  http://www.youtube.com/watch?v=JHPKSdRRPCQ  we are working together on this on the Stubblefield forum.

Thank you for the info about drawing heat away from a coil with a permanent magnet, good info this.

jim

[Pirate88179]

Stefan:

That was what I was thinking as well.  It would seem to me that the iron would hold the residual magnetic field too long to have any real spike or kick to it.  This would be for the same reason we use ferrite toroids on JT circuits and not iron toroids.  I believe we need the magnetic field to collapse almost instantly to get the really high bmf spikes.

Anyway, I have not tried what Jim was speaking of so I don't really know but, what you are saying would make sense.

But, Jim also suggested using bifilar with both iron and copper wire and this might introduce something new into the equation ala the Stubblefield coil effects.  When I get some time, I might whip one up just to see for myself what might happen there.

Bill

[Pirate88179]

@ Jim and Stefan:

I stand corrected with the thoughts in my previous post.  Lidmotor just did a video using iron wire wound in a core to make a JT circuit.

Here is the video:

http://www.youtube.com/watch?v=F7v4vTrQFYk&playnext_from=TL&videos=TNMSSTOxpQA&feature=sub

He said it works well.  He even ran an SEC from the JT circuit that had only the iron wire as a toroid.  He also used the iron wire as conductors in the circuit as well.

Man, just when I think I am learning something, I find out I am wrong.  How this works I do not know.  It should not, but it does.

Bill

[the_big_m_in_ok]

If you build a coil out of iron wire, it will have NO inductive Kickback BackEMF !

I didn't know that, since I have no (potentially hazardous) high voltage experience.

...Just try to pulse it with square waves or pulse waves and you will see it.
...It seems the magnetic field of an iron coil is different
than a copper coil. ...

Thank you for the practical info.  I'll try and remember that in the future.
Also, remember?
The magnet field of the earth is generated by a liquid iron core under the thick silicate mantle.  So, copper may actually behave differently than iron, knowing that fact.

Nevertheless, iron can be used in earth battery systems.

--Lee