Joule Thief

[dog812]

So what do i do to light more LED's without them dimming too much?
More or Less primary turns?
More or less secondary turns?
Something else?

[Mk1]

@Dog812

Good work there , since most toroid are different then mine i can't say for sure , but 2 things one try try try , second the resistor in the circuit can be replaced by a potentiometer to get those light brighter , also have tried connecting the led the other way around. There is no need for meter if you try different things more led in series will show you a bit about how much voltage you got , once you light one brightly then you can add more in parallel.

Mark

[TheNOP]

What to you think of aluminum core.

from a mag field point of view, aluminum and copper behave the same.
strong opposition to magnetic induction(Lenz's law).

aluminum is a bit less conductive then copper but more then iron and does not concentrate mag field.

i don't have much more, mag or electrical, datas on alu, a side those above.
only un-verified, by me, ears say, witch i will probably look at later.

All good info there , but a bit technical for none ee .

thanks , but i am not an electronic engineer.
if one is blindly poking around, how can he be sure he found something new or be sure he did'nt missed something ?
peoples should seek more infos on the stuff they work with.
once know, it is easier to build something with it and know why it does or does'nt work.

cant wait to see what you are up to.

humm..., me too.
what i am up too...
i am in reading mode, tech stuff, as i am missing components to experiment with.
finished a few cores to prepare tho.
and tommorrow i will finish my big toroid, after passing at my sis house to weld the wires.
its for tesla transformer experimenting.

got a few test planned.
a few play with eddy currents and the test i promised you to do.
i will post my results objectively when done.

also some small projects:
hearth batteries.
a few solar cfl garden lamps.
and i got a few electroluminescent panel i wish to make something of.

[jeanna]

So what do i do to light more LED's without them dimming too much?
More or Less primary turns?
More or less secondary turns?
Something else?

Yes, well that is what all this talk about tuning is all about.

When I lit the array of 30 leds, I started with one turn. I never needed more than 53.. That is what the MK1 had on it, but if the lights are in series, they need more, in some cases, anyway.
I did a whole study of how many turns for how many lights on the secondary. Then I picked up a different toroid because it was bigger and I could put more turns on it and... it was completely different!


I have been doing a thorough study of one type of ferrite toroid today starting exactly as I told you this morning.
I made a secondary using a 40 inch long piece of wire. But at first it only had 5 turns on it. I made measurements then added 5 more turns etc. I will make a full report later on when it is finished.

I am now in the process of removing the primary turns and measuring it that way.

There is a place where the amps use goes really low and the lights glow really bright. I ran out of secondary wire before the reverse began to happen.

Soon I will know the best number of turns for the primary.

MK1 has another way which is close. He starts with the primary.

Then when you are done you have the good information on all the toroids like the one you are testing. Others will be different.

The NOP just said hi permeability is good. I am not sure at all if that is true.

My high permeability toroid which cost me a lot more than the others performed miserably. Because of his post, I may recheck it, but for now, I think that came out of a text but not experience with a working jt.

So, lots of words to say... just try it!

jeanna

[Mk1]

@nop

Thanks again. On the alu and copper issue there is heat dispersion factor i know both are good , alu is a good rf shield i don't know for copper it works but what is best , also copper to alu it doesn't connect electrically it need special connector
humm its like electricity doesn't travel in the same state in both. Its said that alu is 2 time better conductor then copper that is per weight.

Mark