Joule Thief

[innovation_station]

im running all my transistors at 4.5vdc and NO FEAR OF HEAT ... PEROID!

IST!

but when i ran in 1 time .. they would blow ..  and get darn hot plus i uped my resistance ... 

[Mk1]

I just do not understand how you can say you know what is happening when all you can see is an amount of voltage in a capacitor???
Where is the diode that is teaching this to you?
I do not understand, I am sorry, but I just don't follow this.

Yes, the scope showed me, but the problem was:
My base resistor was too low and the transistor started to overheat.
It was at 0.5ohm at the highest voltage.
It is too low and simply will kill the transistor.
Then the pulsing will stop.

BTW there is a definite polarity shown on the pickup. It is very strong. Almost nothing goes below the x axis on this.

So, with the tuner being the base resistor I must stop at zero ohm. And, I hope there is another way to tune this because I am out of room.

thank you,

jeanna

Ok , diode are directional devices , they show current flow direction , this is not related to the wave shape ...

Checking the pickup coil voltage with a diode both ways then comparing with the full bridge voltage is how a visualize the wave and get a idea of what is going on , then comparing ac and dc reading , this and my brain replace the scope .

Yet again something new , and a bit more complicated , and have to analyze the result for getting a full picture , what those number mean ...

I am getting tired of this game , why would i even waist my time if it wasn't right ...

And by the way i am pretty sure you can find all this info online nothing new here.

As for the secondary , don't ask me how i know , your carefully taken data speak beyond the numbers , if you have one secondary made of 2 coil placed at different location on a toroid the coil phase is different , and the first coil will effect the second one , this send energy back in the toroid , changing the reaction of the base coil ...

If having a scope means forgetting to use brain cell , i don't need one .

The data is only good if they speak to you , otherwise its useless waist of time .

But , fell free to investigate ,test , and show data proving me wrong .
That would be more efficient then asking me how a can see the invisible .

I know you can do it , keep the good work .


Mark


I don't think killing a transistor is a issue for anyone else , now if you are aiming for higher resistance result then play with a tank , or find a design that works for you this is all part of the designing ... the result in this case are not to your liking then change the design...

There are many ways to fix the working freq , resistor , coil ,tank , timer , quarts ...

[jeanna]

You may want to try to wind it regular and not in the MK way!

I have a lot of mk style.
I made them starting in january and they are very good.
I have been wanting to try the tesla rotating magnet toroid for a while.
I am using my last unwound tor-23 and it is little and loves a very high frequency.

The xtree (same tor-23) gets 141 volts and is wound in the evilmadscientist way on the primary. The pickup is made with a mess of wires on a sort even style inside, but it almost fills the center. The added 21T pickup does fill the center.
So, I am wanting to find out what makes a good wind, when this messy design works.
==
EDIT: It is really not messy in the inside. In between each wire of the primary I slipped 5 pickup wires. When I got to the end and needed to make this 74 turns, I just added them all in one area.
Hmm, now that I say this, I wonder if I found a good way to wind after all. Maybe if I had slipped 7 pickup turns in between the primary bifilar wires, I would have a really good one.
(It was 74 turns because I was matching the xebraK which has 74 pickup turns.)
end edit.
==
(My Modus Operandi is to find out how things work, more than to get them to work, although I like that too!)

I don't think this type of design is made for that type of design but I could be wrong.

huh?
once more, please?

thank you,

jeanna

[jeanna]

.... to analyze the result for getting a full picture , what those number mean ...

All right.
I do not see it, but if I AM able to see it with a scope, then I am glad I spent the money.
I would be unable to do much of this because I cannot visualize what you do.

I am getting tired of this game , why would i even waist my time if it wasn't right ...

Maybe it is time to stop making it a game, and just come out with it straight up?

And by the way i am pretty sure you can find all this info online nothing new here.

Maybe you can... I am just learning.

...

But , fell free to investigate ,test , and show data proving me wrong ...

That is far from what I am trying to do.
I am an experimenter and an investigator.
If my questions make you think I am trying to prove you wrong, then I apologize.
I never intended to say this... I only want to know; and, when I do not understand something I ask; and, when it is contrary to something I understand already I ask again... but so I can learn, NOT so I can prove anybody wrong.

so again I apologize,

jeanna

[stprue]

I have a lot of mk style.
I made them starting in january and they are very good.
I have been wanting to try the tesla rotating magnet toroid for a while.
I am using my last unwound tor-23 and it is little and loves a very high frequency.

The xtree (same tor-23) gets 141 volts and is wound in the evilmadscientist way on the primary. The pickup is made with a mess of wires on a sort even style inside, but it almost fills the center. The added 21T pickup does fill the center.
So, I am wanting to find out what makes a good wind, when this messy design works.

(My Modus Operandi is to find out how things work, more than to get them to work, although I like that too!)
huh?
once more, please?

thank you,

jeanna

What I mean is that you wind up then down but this design crosses over at 90 degrees so if you wind back to your starting position you wont be in the same crossover area.  Like I said though...I'm not sure!

I'm winding a small one pickup version x2 style b/c coils.  I will post results tonight.