Joule Thief

[Mk1]

@all

What makes my compass needle move , and show north and south?

That would be a nice thing to tap into !


@nop

Multi signal yes but single freq tuner ! i guess you need 3 to have some fun , maybe 3 diode radio but they would need to be tune to a something better then radio stations .

@all

On the EB subject , in many EB patent on thing is clear if you but it on a core and coil like a primary you will get transformer effect , the voltage will go up !

Don't take my word on this search it !

Ok well done every one ! so what will be next a cfl self charging aa pack !

I know it can be done with a dummy toroid !

@jeanna

High flux , but permeability ?

You should try to find more about them , are they better at some freq .


Mark

[jeanna]

I guess everyone went to sleep?
I added 2 more turns to the collector coil of the primary and the light brightened a bit.
The amps draw dropped to 12.5mA
The 104cap is still necessary
the BJTL is still necessary.
The frequency is still 1.4MHz

This is the u=60

I have an identical toroid with u=125

I will make these identical turns in the morning and compare. Then I will make a pickup of some size. I don't have as much room as if I didn't need all those turns. I better use the newbie wire since it is easier to get really close.

jeanna

[jeanna]

@jeanna

High flux , but permeability ?

You should try to find more about them , are they better at some freq .


Mark

I thought hi flux WAS low permeability.
The permeability is really low u=60 and u=125 are mostly not on people's charts. So, I do not know.

Are there any marks on your green one?

jeanna

[xee2]

@ jeanna

What size toroid are you using? From your results I would guess you need at least 20 turns for collector coil. To light a CFL you are going to want the collector coil to produce at least 40 volts. The pickup coil should then be at least 10 times more turns than collector coil to get 400 volts on the pickup coil.

[Mk1]

@jeanna

http://www.2622736.com/ch229.htm

i have found on this page the specs some have a 26 on perm.


Edit i also found that http://en.wikipedia.org/wiki/Permeability_(electromagnetism)

nice things to know !

Mark