Joule Thief

[xee2]

@ jeanna

Just a little education reminder that you may not be thinking about. The inductance of a coil will change when more coils are added to the toroid. All of the coils couple through mutual inductance and each coil adds to the inductance of the others. So if you want to know the inductance of a single coil, it will have to be the only coil on the toroid. However, if you keep all of the other coils open circuit, I think (but am not sure) that they will not add any inductance to the coil you are measuring. You should check that last bit since I am not sure about it.

[Magluvin]

Very cool Wilby
Did you see any advantages vs magnetic cores?

Mags

[Pirate88179]

@Bill
They discontinued that toroid which is why allelectronics had them. They buy overstocks and discontinued. It is the reason I sometimes buy a couple extras on a next order when I like something.
I have bought the little tor-23 by the 20 pack a couple of times.

Jeanna

Jeanna:

Thanks.  Well, maybe they will suggest something similar from my rfq and also my request for free samples?  We will see.

Bill

[xee2]

@ all

If anyone is interested, the OW48613TC is in the 2009 catalog so they seem to still have it available if someone wants to order it.

I found the new link to the design guide if anyone wants to download it: http://www.mag-inc.com/File%20Library/Product%20Literature/Ferrite%20Literature/Magnetics%20SFF%20Catalog3%202_09.pdf

This link is working since I just used it.

[WilbyInebriated]

Very cool Wilby
Did you see any advantages vs magnetic cores?

Mags

higher frequencies, i don't know if that's an advantage, i guess it would depend on your goal.  i can't tell you exactly what freq. they were running at. the only scope i have at the moment is my virtins pocket instrument on my dell axim v51 pocket pc. it is limited by the sound card.