Joule Thief

[TheNOP]

WOW so this things total ouput would be 2240 rectified DC volts!  Great work MK1 and nice clear pic as well

in practice, it does not add up to 2240 volts, at least not for me.

[stprue]

in practice, it does not add up to 2240 volts, at least not for me.

I'm not sure what you mean!  Are you saying you can't add them together to get a larger total or are there losses that occure?

[jeanna]

I'm not sure what you mean!  Are you saying you can't add them together to get a larger total or are there losses that occure?

Hi stprue,
One of the things I have learned here is that I must try it to find out.

I know you know this.


So, my fluoro lighting arrangement was with a MK1 design (13T,3T,240T-ultimately giving 450V!) using that same allelectronics toroid you have.
I used a 2N3055 and found that it needed
13T on the base and
3T on the collector coils.
This was backwards from the normal way.
Before I turned it around this way, I was only getting 80v or 15v from all that wire and work.
Once working, I tuned it with a pot in the way MK1 describes. I ran out of collector coil wire to test to see if any more turns would help. but it did light a fluoro, and well.

The MK1 windings may be nominal (even giving 450v) so if you are going to make one (a winner) like this, may I recommend that you plan to make it with  a bigger secondary. There is plenty of room.

I used newbie wire 24 gauge in red.
I used 60 turns each section.
Xee2 recommended 80-85 turns in each section. Maybe you should try that first.
(1 section = up or down) so the total turns would be 320T or 340T secondary.
That oughtta rock!

Have you wound this one yet? (I know, you just got back  )

jeanna

[Artic_Knight]

?
are you sure that the reading you got was not .13 volts instead ?

unless you are talking of with a jt connect to the battery, you probably made a mistake somewhere.

well i am unable to replicate my results at this time so it may have been a mistake as previously posted however 1.314v with cap and 1.314v without. the voltage should not drop to say the least! i can say for sure that the voltage is higher with a cap in parallel in the earth battery i have done. that happens every time i measure

[resonanceman]

My frequency went way way down when I removed the core on that Stubblefield generator.

From 41.6KHz with the bolt in place,  to 7.57KHz when I took it out.

Gary,
I wanted to confirm that you are using one battery?

thank you,

jeanna

Jeanna

My  original picture  was with  2 AAs

I  am  posting  a picture  with it running with  only one AA

In this picture  it is  running around  .12A   
The  output voltage across the LED array is  22.4
It is not  quite as bright as  with  2 batterys  but it is close .

The picture  is  with no tank circuit .
I tried  a few  different   caps .... the performance  didn;t  change much   until  I  tried  a really big cap .......a  5 uF  run cap     it  gained  almost half a volt  and the  current  dropped to .08A
The  problem  with this   setup  is with the  big cap  the  sweet spot is  VERY tight . ....... without the cap the sweet spot is  pretty  wide .
With  2 batterys it is very wide .

I  am not noticing  near as much  benifit   from the  Jesus  charger  with this  setup    I am only  getting about  .02 V more when I connect it .
I think  it does  better with a higher load .

hope this  answers your questions


gary