Joule Thief

[xee2]

@ jeanna

My toroid is smaller in diameter, though. I actually think this is a problem.
It is less than 1 inch.

Size of toroid should not matter. It is the proportions of toroid that effect performance. If one toroid has all dimensions shrunk be the same percentage then performance will be the same except for saturation. I use big toroids because they are easier to wind.

[gadgetmall]

@ALL . And now Made it a bit better and call it the HVJTGADGET . and TV DISRUPTOR  

[jeanna]

Thanks xee.
That is interesting.

I have been searching U value for flux and I cannot find much by googling. Is the U value high in hi flux or low?
I ask because the high flux ferrites at the online source somewhere has U values of 60 and 120. The one Gadgetmall just showed has a much higher number. I am wondering which to buy.

@All,
I just found a limit of sorts.

I am setting up the enormo toroid for winding, and I found that with 2 turns as the base coil, I must have a HIGH value resistor or cap at the base in order for the light to go on. (I found a flicker then out spot too.)

However, with just one more base coil turn, a low value resistor lights the light just fine.
This was 2T, 9T but 3T,9T is great. I think I will play with this a bit more. This may be valuable and might add to our understanding of what is happening here at the base coil or perhaps the base to collector relationship. I will have a little look..

@Gadget,
What is that straight ferrite with the turns doing in your circuit?

I had a dream this morning and I was being taught to use a thing like that. My teacher said I could buy them, but I would learn more if I made them myself and experimented. (good teacher!)

jeanna

[gadgetmall]

Thanks xee.
That is interesting.

I have been searching U value for flux and I cannot find much by googling. Is the U value high in hi flux or low?
I ask because the high flux ferrites at the online source somewhere has U values of 60 and 120. The one Gadgetmall just showed has a much higher number. I am wondering which to buy.

@All,
I just found a limit of sorts.

I am setting up the enormo toroid for winding, and I found that with 2 turns as the base coil, I must have a HIGH value resistor or cap at the base in order for the light to go on. (I found a flicker then out spot too.)

However, with just one more base coil turn, a low value resistor lights the light just fine.
This was 2T, 9T but 3T,9T is great. I think I will play with this a bit more. This may be valuable and might add to our understanding of what is happening here at the base coil or perhaps the base to collector relationship. I will have a little look..

@Gadget,
What is that straight ferrite with the turns doing in your circuit?

I had a dream this morning and I was being taught to use a thing like that. My teacher said I could buy them, but I would learn more if I made them myself and experimented. (good teacher!)

jeanna

Its a  ferrite tuning coil and part of the tank circuit Uh unknown but is providing a capacitive reaction between the ring ,  5 k VR and 104 cap . That little coil boosted the volts up and its intention was to narrow the harmonics but it juts amplified them in resonance and really fuzzes out a tv . I had a bag of different ones and just picked this one cause it fits. . accidents happen and this was a good one . I have one more core and i want to double up on the secondary this time may be several Outs ...

Gadget

[jeanna]

Its a  ferrite tuning coil and part of the tank circuit Uh unknown but is providing a capacitive reaction between the ring ,  5 k VR and 104 cap . That little coil boosted the volts up and its intention was to narrow the harmonics but it juts amplified them in resonance ...

====
Thanks . Its high still in my opinion but its a darlington transistor and not tuned with a tank . close . 69 ma @ 1.2 volts using 1.5 k on the base with a 104 cap across . i'm shooting for the current draw of a normal jt of 14ma or thereabouts with the HV output . I am pretty sure i can do this but this thing needs to be in a cage   
Gadget

So, Gadget, how is it connected and to which of these parts? I mean is it parallel to the pot and cap?... in series with them

Also in the bottom right hand corner of the close-up where this is prominent, there is something else I do not recognize. Maybe I should and it is at a funny angle. Please tell me what it is?

I like altoids boxes. curiously strong circuits, deserve to be in the right container you know. 

thank you,

jeanna