Joule Thief

[innovation_station]

yes agin mr.m i do agree..

i did a test useing an ac adaptor made a video it is up loading now ...

in this video ... you see the exact same thing as you just explained but in reverse  i get a dc ripple + and -

william

ill add the link  it apears you tube didnt like it ...  says it failed after a long time ... hummm

[PaulLowrance]

Hi,

I finished the battery test,

http://www.overunity.com/index.php?topic=8387.msg213881#msg213881

Regards,
Paul

[xee2]

@ jeanna

I assume you will be testing the sample cores you are getting. When you do I think it would be valuable to compare the inductance values of the samples to the 3.38" toroids (with the same number of turns on each). This is because ultimately it is the inductance of the coils that determines the JT performance. So if a smaller toroid has the same coil inductances it should also produce the same performance. I think this will enable you to get a better idea of how well the different toroids will work without building a lot of JTs.
If you do this I would appreciate it if you would post the inductance of 2 turns and 10 turns on the 3.38" toroid.

[jeanna]

Yes, xee2,

This is the exact test I am planning to make.

Thank you. I am glad to know my thinking is right.

jeanna

edit... but then I will make a jt with each one to see what works best.
I have seen different inductances work differently on various toroids. I suspect this is because of the "A" or possibly  the "r" in the formula for L.
I can have a range of inductance and there is more to sort out about this, and it is pretty interesting.

[Pirate88179]

@ All:

I thought you might like to see this video I found on Youtube.  It is a newer Coleman cordless screwdriver using supercaps.  This one FULLY charges in 30 seconds!!!

http://www.youtube.com/watch?v=1VA88eJ9V-8&feature=rec-fresh+div-r-6-H

There is even better stuff than this on the horizon.

Bill