Joule Thief

[jeanna]

@jeanna

I just want to make sure i got you right, on the toroid of my design you changed the 2x 7 turns to 2x11,if your toroid is different it could help achieve the 60 volts , this is not for the bifilar one.

No, mark. I am testing the one I made as truely like yours as I could against the standard little joule thief as described by evilmadscientist.com. I had already made a couple of those, but in order to actually compare the designs, I needed to make a bigger one because the hole of those I had already made was too small to accommodate the fatter mag wire.

I have 2 toroids from a package of 2, so they are matched. I am just changing one thing at a time to see what it is about these 2 designs that makes them different.

Yours is decidedly more difficult and confusing to make. I was hoping to find a simpler way, because I will want to hope people can make their own. It is just a test.

When I am finished, I will either have something just as good but easier or another one just the same. Either way, I'll be finished soon - tonight, or tomorrow.

Thanks,

jeanna

[TheNOP]

@electricme and all

i might be wrong, but i think the joule thief is already using part of the back emf for oscillation.

back emf alone does not have more energy in it then the emf energy used.
yes, you will be able to charge a second battery with it, minus the circuit lost..
tapping on the back emf while charging the battery will reduce the energy sent to it.

like i sayed, the joule thief is a voltage amplifier, by a factor of 2X and 2.2X in my 2 firsts jt, and a core is not really needed for it work.
just 2 separated inductors without cores work too.

but a core sure open other horizons to us.

[Mk1]

@TheNOP

I even think that it is that emf that induce the power to the toroid and transfers it to the other coils,that is y it works in the first place, A transformer only works on ac , it is the only way it works, transformer don't work from dc, that is the reason in has a transistor, the coils are center bias making it good ac oscillator , the regular joule thief works the led in ac . 

[Pirate88179]

@ All:

Another youtube video of me lighting 300 leds from the modified Fuji AA circuit.

http://www.youtube.com/watch?v=atFTenzGHSA

Thanks all.

Bill

[jeanna]

OK group,

Well, this last version seems to be along the same amounts as all the others.

This one has only one difference from the mk1 design.

It has the bifilar coil going around the toroid. 11 bif = 22 wires.
then the secondary pair as mk1 describes, 13 up 13 down on each side of the center of the jt. for a total of 52 turns.

The toroid material is the same material as the mk1 I made and showed lighting 30 leds 2 nights ago. (I bought this to take apart. It was a filter and may be laminate)

1- the rectified voltage is 29V one way 25V the other way.

2- the array reads about the same:
from the 1st neg to the last pos it reads 7.2VAC (on this place it is 0.00VDC)
from the 1st neg to the last neg 4.8 VDC
from the 1st pos to the last pos 4.8 VDC

So far the  best rectified voltage is from the 64 turns which is how many turns were needed to make them even both ways. They total 72.3 volts if you add them together - I don't know why you would do that, but perhaps, that IS the total AC voltage.  The style on that winner was entirely evilmadscientist style.  -- but this may not be a fair comparison because the number of turns is higher.??

------

Now,
I think the material is likely to be what is making the difference.

Not that 24 volts is a bad thing. Most RV's and solar houses run off 24volts.

So, now, I want to tackle the amps. Or do I?

Mark, what do you think is happening ampwise?  Is this emf slop we are picking up from the floor drawing amps from the battery? or from the slop on the floor.?

I will say that the lights were brighter for twice as long with the mk1 set-up. And it still used a bit less than the evilmadscie... style.

I need to re-test the original little jt toroid with the array, because When I was first testing that, I had a LED in the jt which meant that it was coming off the battery, not the emf as the array is.

I will do that overnight. I don't need to take hourly measurements. I can just look after 10 hours.

-----

I am intrigued with the idea of a series arrangement of joule thiefs.

Mark, please tell me how you hook them up.

My thought on this is as follows. (it ought to make it easier to answer, I hope.)

I put a jumper from the Collector of the transistor to a clear spot on the breadboard. I do the same with the end of the resistor,  I connect a new jt to these spots, and stick the twisted end into a spot  on the red band along with the other twisted end from the other jt.

If that is what you are calling series connected jt's then I am good to go.

thank you especially mark,

jeanna