Joule Thief

[jadaro2600]

@jadaro

In my mk8 on one coil a 470 uf reaches 35 volts in 3 sec. so i have 15 more coils ?

I don't think I understand what you mean by this.  Other than it being a matter of fact - what context is it in  Are you saying that you use 16 coils?  on the same toroid?

..thanks for those links gyulasun!

[Mk1]

I don't think I understand what you mean by this.  Other than it being a matter of fact - what context is it in  Are you saying that you use 16 coils?  on the same toroid?

..thanks for those links gyulasun!

On the mk8 there is 16 coil i need one , to get 100 volts rectified dc. one coil connected on a 470uf i get 35 volts in 3 sec.

[resonanceman]

@gary

2n2222 and 2n3904 , are pretty much be all you need , since we will not be using the original jt coil to pick up the extra juice, but additional coil. A better transistor will most likely consume more energy , some like to run with higher voltages , i don't care . That is just me there , if a 1.5 battery runs of a week , like the led jt that is enough for me now.

Also the transistor can work both way has long as you keep the base. i some time tune the core with the transistor reversed .

Mark

You said you have one working , so make a additional coil around the one working and put a led on it.

Mark
I agree that  the  3904 is  enough for  the standard JT
The  MOSFET is  for   other things .    Mastering  the  basic JT is just  a start ........from there it  goes to  seeing what  you can do with it . or how  you  can  modify it .

The  2N7000   has a gate threshold  min of 0.8 so it should  still work  pretty good  on AAs


gary

[jadaro2600]

I just found a toroid from an old pc power supply, actually four of then of various types and sizes, I hooked up the one that's about an inch in diameter, and it seems to work - but, I suppose that there are some issues with the way I wound it...  I'm attempting to wind a third coil on it now.  The odd thing is, it work with my basic circuit but won't accept a large capacitor.

[Mk1]

I just found a toroid from an old pc power supply, actually four of then of various types and sizes, I hooked up the one that's about an inch in diameter, and it seems to work - but, I suppose that there are some issues with the way I wound it...  I'm attempting to wind a third coil on it now.  The odd thing is, it work with my basic circuit but won't accept a large capacitor.

Keep it simple for now.

Then put a third coil on it , and connect a led on it , if it don't work reverse the polarity on the led . Don't trust the meter. it will not always showing voltage when not rectified.