Joule Thief

[resonanceman]

@Gary,
So far so good.   You mean connects to the pot the other one to the collector , I am sure. So, yes.
Me either.

I think you are starting with too many turns.
MK1 indicates that he uses only a few.
Your tuning will tell, but expect it to be more like a total of 7 of each color total.
That would be 7T,7T primary.

Gary, do yourself a favor and just wind one even temporarily like the MK1.
You can take it out and do the other as you suggest.

When you wind the MKx secondary you go up then down on one side of this.
I don't think you need to cut but leave some wire when you cross over and then go up then down again.
That is an MK1 It is really powerful.

thanks,

jeanna

PS

I somehow missed that picture. I thought I had been through all the pages of this thread at least 3 times.

I have never seen that one!
I have not made mine like this, but I will.
Mine are made with red on one side connected through the middle to the other color on the other side. This way looks like it won't want to un-wrap as much. That is what I didn't like about the split method.

Do you happen to know what page or date that is from? or, did MK1 post it?

Jeanna   

Sorry  I  didn't  record  where  it came from ........but  I am sure you should  have seen it ......I am pretty sure  that it was in a  sting   of  posts   I think MK  was  explaining  them to you ........  the  one I  posted was   I think the second in the string .

I made this one  because  it  looking at the  drawings  it made sense to me . .......  the  way  the MK1s  drawings  are done  I  am not sure how to go about it .

I agree that there are to many turns on mine ......I  intended  on  making sure I had  plenty then taking some off . ......


I am out of time for  tonight .
I hope to get  a secondary   wound  tomorow

Rather than  working on my secondary  tonight  I did the primarys   for my  little  toroid .
havn't tested it yet  .......but it is wound



On my  little one  I  tried   just  a litle hot  glue  to hold  the  wires in place .... it works  pretty good ....... it is easy to  get to much glue on  there .........but if you heat it  up  pretty good  you can wipe  it off with a rag  .
I  just  used   a dab on the side  of  the  toroid ......  Just  enough to keep  the  wire in place to start  wrapping .
I only  glued  the  first  wire into position ...until I  was  done with  that set .   
I find it is easier to wind  them with a little space in between then  push  them together . .
SO .......when I  had put on  enough wraps  I  squeezed  them together and tacked them  into place with a little more hot glue .

gary

[resonanceman]

Hi Gary yes part numbers are ALD110800/ALD110900. They are available from Digikey as quad and dual devices in PDIP and SOIC packages in four different models and they feature, as the most salient specification, Gate Threshold Voltage of 0.0 V +/- 0.01V @ 1 uA.

Gadget

Thanks  Gadget

I will  look them up tomorrow


gary

[TheNOP]

I don't  know  that  my toroid  has  any problems .......I used it  because  I  have had my best  success so far with  this  kind of toroid .
( goldmine  5 fir $1  )   
I always  start out  with  a  good sized  cap  across the   pot
I have found  that some  will  work  without the cap but not all of them  ......but  so far they have all worked  with a cap .....so   I use one  to get first light

doing things empiricaly is not something easy to do.
there can be a lots of misunderstanding of the observations of an experiment.
in faq there are more misunderstanding when you know nothing about the subject.
it is also more easy to completly miss something important.

you are all ready to learn from other members of this forum.
why not learn from others that really know their stuff ?
learning from academic stuff, then prouve them right or wrong trough experimentations is way faster.
to me, it kinda look like each of you is re-inventing the wheel separatly.

you may have success with the goldmine's  5 for $1, but do you know if you can make work better and how to know for sure ?

from your question on "how to tune", i am assuming that you don't really know and would like a step by step tutorial.
the problem is that this tutorial would contain so many "if", "and" and "or" that it is almost impossible to make one.

the how many turns tuning of the primaries is only an attempt to conserve spaces.
more turn then nescessairy wont do much once the maximum coupling is reached.
well, there will be other parameters changes.
it will change the jt frequency when under load.
those changes can either be good or bad depending on your core.

like i said, there are so many factors at play, that most of you won't make it far with only empirical methods.

@ALL
what i wrote here is not only for resonanceman, it is for all that read my post.
same thing with most of my replying posts.
so, if you missed informations, thinking the reply was not for you, then i suggest to you to go look back.

spreding the turns around the toroid can help too, but never forget that the mag field is at 90 degree to the wire creating it.
wire at \ and at | does not make exactly the same effect on the core.

This  does not  agree with what I have been finding
At  first  I started   spreading the   windings  around the  toroid ......the idea was to  cut down on dead  spots.
I think  the  design  of the MK2  eliminates most of the  dead  spots .
I have notices that  squeezing  the  windings  close together  usually helps  more than   winding them  tightly on the toroid .
Because  the  primary  windings  are single layer ..... I have been  placing  a string  across  the  outside of the toroid where the windings will  be ....... and I  tie the windings together  once I am  finished 

but never forget that the mag field is at 90 degree to the wire creating it.
wire at \ and at | does not make exactly the same effect on the core.

the picture there show what i mean by spreding the coil around while keeping the wires at 90 degrees relative to the core.
http://www.overunity.com/index.php?topic=6123.msg172911#msg172911
so, i think we are saying the same thing. 

[electricme]

@Cat
Welcome to the JT forum.
It's nice to know there are people out "there", do read up on what we are doing. 

You are very welcome to join us when you feel ready to do so.

jim

 

 

[xee2]

@ MK1

News about the mk1 High voltage , dual 80 inch pickup coil , 850 v rectified dc its about 70 turns , 2n2222 with 1k base resistor diode bridge made of 1n4007. Any idea what i will be doing with this one ? And this is from a one inch toroid .

Is the red wire how the pickup coil was wound to get the 850 volts? How many turns did you use for JT coils?