Joule Thief

[Koen1]

@MK: cool pic you posted there!
Yep, one rod through two ring cores would sort of equal
a single loop coil on a core with 2 many-loop coils
High current through the rod => high voltage from the coils.
... and then connect the coils in "buck boost" fashion,
much like the JTs, with diodes at the right places,
and there you go.

And about the Hall effects, I know a little about Hall effect
in that it is basically identical to what happens in a homopolar dynamo;
doesn't really matter if it's the conductor with the electrons in it that moves,
or if it's the electrons themselves that move through the conductor,
but if it happens inside a magnetic field and perpendicular to the field "lines",
part of the moving electrons are 'deflected' and a secondary electron flow
appears roughly perpendicular to the original flow and the magnetic field "lines",
in the same plane as the original flow.
In a homopolar dynamo this results in a current between rim and center of the wheel,
in a Hall effect probe this results in a current perpendicular to the drive current.
And then there's the quantum Hall effect which is slightly different and involves
the auto-arrangement of opposing spin electrons inside a single current under
the influence of the currents own magnetic field... but that's not what is usually
meant with the term Hall effect.
Hope that helps any?

@Bill: interesting announcement there, about the light thing
Can you tell us more?

Regards,
Koen

[nievesoliveras]

@all

Any idea?

The rod is used when the voltage is ac in order to get the sweet point that the elctricity output is the best.

@timmy posted a link that explains that.

Jesus

Edit:

It is called inductive reactance.

http://www.magnet.fsu.edu/education/tutorials/java/inductivereactance/index.html

[Goat]

@ Pirate and All

There's been mentioned of super caps throughout the thread so I thought I'd share a thought with you all, I was at the electronic store to get some parts and big caps here in Canada are OUTRAGEOUSLY EXPENSIVE so I decided to forgo that part of the purchase.  On my way home I remembered seeing some bass stiffener super caps at Walmart and decided that for the price it would be cheaper than getting large caps and more versatile across different projects to use one of those instead

Here's a picture of it on a gadgetmall bedini fan type setup.

[electricme]

@Ist

A Series Parallel arrangement to charge a 12v SLA cell, using a JT


Use a LM3914 Dot/Bar driver IC chip, the outputs could switch on a selected MOSFET, set the time "on" and time "off" then the output goes to the 2nd Mosfet, the same occurs, then to the 3rd, 4th 5th etc etc as many Caps / batteries you want to charge up.
At this stage, use a flip flop circuit to do a series discharge of the caps into a bank of Nicads or wet cell battery.

The 1st hi pulse turns on all MOSFETs completing the crt to the battery, which discharges all the caps into the battery itself.
T 2nd cycle of the flip flop resets the LM3914 chip counter and it begins all over again.

The lower the cap capacity, the faster it can recharge and discharge, which makes the whole shebang work faster.

Set up all your 1.2v Cells or capacitors with a 1N4004 at the positave, so the current dosent leak back to another cell.
Have a number of MOSFETS that can turn on all together, connecting the caps in series to make up whatever voltage you need.

I have not made this up but I see no probs, I will get stuck into a circuit this weekend, and prob go and buy a LED Voltmeter kit or 2 with a handful of MOSFETS, we will see.

The only thing with this, I would need to have a charged 12v gell cell so it could start, or is there another way to do this?

General Jim

[electricme]

@Mk1
Is there an expert on Hall Effect stuff here. 
Nope but I have had an idea I posted quite a few back.


Get a redundent floppy disk drive, look under it, there is a big flywheel, it has a small magnet that flyes round and round, it passes by a tiny black transister, this is a hall effect transister I beleive, (sorry I was wrong).

*** EDIT *** by Jim,
I Just pulled apart 2 floppy disk drives,
There is NO hall Tr there, sorry guys, my mistake, I was so sure there was one there.
There is a tiny magnet which passes by a tiny wire wound ferite, this is glued to the pcb.
This must be some type of sync pulse or tacho thing for the motor RPMs.

OK lets start fooling around with Hall Effect Transisters, these things are expensieve.

These things sence a magnetic field and turn on or off, same as a transistor, but thats all I know, I can see more studdy time  coming up lol.

General Jim

Hooroo, Gotta pak 4 weekend, will try to keep up to date by my laptop.

@bill,
I was a bit crook this morning, will PM u soon as soon as I''m " outa the woods".