Joule Thief

[Artic_Knight]

@NOP

which curcuit the one with the coils only? i havent tested that out yet and dont know if it will osciliate i would think that it would but thats not a sure thing. if you want you could try this also. isolate a coil and add a cap to it. if they are set up like the JT so that one creates a magnetic field that opposes the other (one coil wired backwards or using a flow of electricity opposite of the battery) it should oscilate then.

once the current on one coil reaches the potential of the current in the other coil but in a opposing field they should cancel out creating our oscilating effect. 

sorry, right now im more focused on a couple side projects that utilize high frequency dc and havent spent as much time with the JT.  what i really need is a osciliscope. i may have to rent one for a day or something

[jeanna]

the picture i post here has the battery and probe info i was hoping for.
...

my objective is to find the simplest purest and best performing oscilator then from there build up on it to power what ever be the case and hopefully being mindful of these objectives come to a better version of the joule thief

thanks

You know I still struggle with circuit diagrams. (I am improving with all the practice.  )
Still, I think the battery is upside down to the aspect of the rest of the circuit.
The tap of the toroid windings which I believe is what you have drawn into the neg side of the battery is supposed to go into the positive.

Plus add to it all that good information from xee2 on the value of high resistance to increase the oscillations of the jtc.
I refer to this because it has been MY experience that the higher the resistance the higher the frequency.
I went as high as 50K ohm. I think that is high enough to show the tendency.

In any case, I could stick a probe on a jt, but I would not be showing the circuit you have unless I change it around...

I first want to look at the frequency changes xee2 suggested in his explanation of jtc oscillation, where the collector coil can have more turns than the base coil to give higher frequency.

Anyway, If you can clarify, I may be able to help.

jeanna

@All,
Go to the health food store.
Get some teatree oil and some eucalyptus oil.
Put 1-3 drops of each onto a cloth hankerchief.
Breathe into this and keep the hankerchief tucked into your collar.

You will be safe.
No coughed virus can make it past this barrier, and if you do get a touch of it, you will build up immunity better than any other way.
Hopefully, you have had some kind of flu in the past 2 or 3 years, because this will offer better real protection than any vaccine- esp. the kind they give out now with killed bits of virus DNA.
THAT Emperor is wearing no clothes, my friends.
(I studied biology oh so long ago, and immunology was the field I worked in.. I am not a modern expert, but I do know that nature provides the best cure - always.)

[jeanna]

Hi all:
   Just wanted to share my last bit of fun. I made a jt out of a large metal washer. It worked ok
but what was funny was the scope output wave. It has two distinct waves with one superimposed
over the other one. Like haveing the on and off pulses of the transistor riding on an AC signal. Very
strange. Funny to see it. Other than that, nothing to boast about for output wise.

thaelin

Every once in a while I get a thing like that too. Do you have more specific information you could provide with this?
I was planning to return to the toroid that gives me this appearance of a double wave, but I didn't know what it meant.
People here suggested an interference pattern, but I am not sure.
Maybe it does mean something?

However, we need all the info right down to the
battery, and transistor, base resistor value, and how many turns, and maybe the kind of washer... OK?

thanks,

jeanna

[Artic_Knight]

yea i wont swear that i have the orientation of the parts 100% accurate. it was a quick draw. one thing i have noticed tho is you can reverse the battery and it will work however youll have to change some of the electronic setup to produce the same results using the opposite current.  in reality i think its probobly about the best thing but i am not satisfied with the transistor leakage, it may be miniscuel but its still leakage!

[Thaelin]

Hazens:
   That is going to be one super flyer. You will be the envy of them all. I bet you are going to
start a fad that will sweep the world. People have not done such as it does drain the batts. In
gas run, the batts are small and run the controls so many will not put extra things on them.

Let the fun begin. Me and a friend did a powered hang glider years ago. Should have seen the
looks at the park when it came flying over them. Wing span was just over 3 feet.



thaelin