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Author Topic: Joule Thief 101  (Read 793786 times)

Offline innovation_station

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Re: Joule Thief 101
« Reply #30 on: November 24, 2009, 06:13:41 PM »
Hello all,

WOOOOOW, so nice JTs!

And not 1 pf of stray capacitance.

Maybe a bigger diameter of your cores with coils?

Otto

hello old friend ! welcome to wonderland!

like this?

 ;D

w814

this is my gold ring .. this is the coil im soon gonna build public with whoever wants to build it ..

were gonna grab the electric car market with this thing ...  :o :o :o :o

what is showen here is the 140mm W material core . i have spoke of  it is resonant at 1.5khz.. the last picture has 60 outputs...  basic MK2 IST 60 Config..

this core first had to be tuned!  5 TURN BASIC JT!  8)

what you see showen in my driver pic .. is npn pnp switching  this drives my first picture  it is my

SKY
808
  COIL this coil is sync banging rotating 2 freq and 2 phase it has built in recovery and i flip phases  it is perpetual by coil winding and switching operation

THIS IS THE MOST ADVANCED COIL EXPOSED PUBLIC ON THE PLANET!
« Last Edit: November 24, 2009, 07:47:36 PM by innovation_station »

Offline resonanceman

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Re: Joule Thief 101
« Reply #31 on: November 24, 2009, 06:28:49 PM »
here is a picture of my accidental tesla mini jt...

displaying radient spark from 1 wire ..

rectified and here is the youtube video ...

quick cold charge!

db107 bridge

ist!  i forgot to mention this can be dubbled for output .. this is only 1 side and i can put as many as fit on that core ..  however i so desire ...

was over 500v till the kick back from the cfl ;) fryed it ...
http://www.youtube.com/user/innovationstation#p/u/6/psRWo7wwtK0

IST

That  primary is  one I have never seen before .
It is like  half  of a MK2 only  wound  with  a twisted pair .   

Very nice   :)


What  size is the wire for the secondary ?
I am guessing  #30

gary

Offline innovation_station

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Re: Joule Thief 101
« Reply #32 on: November 24, 2009, 06:35:59 PM »
it was super fine im thinking 34ga

more pictures comeing ..

i have lots.. 

i have been unable to find the solder spool ones!

ill have to dig out a box full of em  then ill snap a few pics. ;D

w

Offline broli

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Re: Joule Thief 101
« Reply #33 on: November 24, 2009, 07:10:42 PM »
What's the purpose of the capacitor in parallel with the resistor?

Offline resonanceman

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Re: Joule Thief 101
« Reply #34 on: November 24, 2009, 07:12:10 PM »
it was super fine im thinking 34ga

more pictures comeing ..

i have lots.. 

i have been unable to find the solder spool ones!



ill have to dig out a box full of em  then ill snap a few pics. ;D

w


IST

Great pictures   :)

I look forward to  seeing more .


I have a request .
This  thead  is  for learning.
The  pictures  are great  but  do you  think  you could  add a few words about  these JTs.
I DO NOT want complete specs .......  just a few words .
Maybe  what is unique about it .........or  why it was hard to make .
Ir why it was a first  for you. .......
Your pictures  can  be  turned into a VERY  valuable  teaching tool with  just a few words of description about each coil

:)

I am also  courious  about some of them,
If you don;t   choose to say anything on your own   I might  ask  you  questions about them .......I imagin I could  finish posting  all my questions within a week  or so .

:)


gary


Offline innovation_station

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Re: Joule Thief 101
« Reply #35 on: November 24, 2009, 07:18:38 PM »
sounds great!

i have seen cap is not needed on input ..

some will argue this it is because they want the thing to run on 1 ma for months...

no concern for my designs

i put the tesla mini .. first .. as it is the best one i have made   ;)

infact not seen another yet!  if you had 2 outputs like that coil then recitifer 1 from each side ..  intresting results as it is mk2 winding config..  there out of phase of 1 another cold ac ?

w

here is a picture of yet another way it can be done  and if you tune the coils to 7.xx hz  might be intresting or perhaps a magnet

Offline resonanceman

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Re: Joule Thief 101
« Reply #36 on: November 24, 2009, 07:35:27 PM »
it was super fine im thinking 34ga

more pictures comeing ..

i have lots.. 

i have been unable to find the solder spool ones!



ill have to dig out a box full of em  then ill snap a few pics. ;D

w


IST

Great pictures   :)

I look forward to  seeing more .


I have a request .
This  thead  is  for learning.
The  pictures  are great  but  do you  think  you could  add a few words about  these JTs.
I DO NOT want complete specs .......  just a few words .
Maybe  what is unique about it .........or  why it was hard to make .
Ir why it was a first  for you. .......
Your pictures  can  be  turned into a VERY  valuable  teaching tool with  just a few words of description about each coil

:)

I am also  courious  about some of them,
If you don;t   choose to say anything on your own   I might  ask  you  questions about them .......I imagin I could  finish posting  all my questions within a week  or so .

:)


gary


Offline jeanna

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Re: Joule Thief 101
« Reply #37 on: November 24, 2009, 11:09:08 PM »
What's the purpose of the capacitor in parallel with the resistor?
Hi Broli,
This is not absolutely necessary.
It acts as a sort of 'repeater' and reduces the amps draw.
 It seems that with it there( at the right size which is critical), the repeats take the place of more juice coming in from the battery.
This allows you to set the base resistor at 10k ohm rather than 1k ohms to get the same switching.

I only resort to using this with a fluoro tube. And, then it was the thing that got mine to start.
But, I believe I had too few turns on mine and it would not have needed it if I had more turns.

good question.
thank you,

jeanna

Offline jeanna

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Re: Joule Thief 101
« Reply #38 on: November 25, 2009, 04:23:28 AM »
I just found a good picturs from early last winter.
This is 3 turns on a secondary.
These lights are very bright and I suspect they may all be in parallel, but the way they are lined up makes me think they are series as well... bright output.
This is a cam from the computer and not from the digital camera which adjusts for light.

This is to give a good example of how great it is to use the secondaryand NOT the regular C-E junction, for the light, if anyone is still in doubt.

egads it even still has the regular joule thief light in there too! this is a very old pic!!
jeanna

Offline broli

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Re: Joule Thief 101
« Reply #39 on: November 25, 2009, 04:23:37 AM »
http://www.overunity.com/index.php?topic=8341.msg210330#msg210330

I have been looking at those and I believe I understand the principle on all but the second one was tricky. It took me a bit to understand what was happening or so I believe.

So current flows to 100nF cap, this current causes induction in lower JT winding. Now current flows into base and opens transistor. This makes a less resistive path to battery so even more current is now allowed through upper winding, again this causes induction in lower JT winding and opening the transistor even more, while that is happening the 0.77nF cap quickly charges and stops current flow. Then the transistor abruptly shuts off and our discharge happens.

If this is correct, then whoever came up with that circuit thought it through pretty good, it's beyond me how you can find the exact values to get it working.

Offline topothemtn

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Re: Joule Thief 101
« Reply #40 on: November 25, 2009, 05:06:21 AM »
Can anyone tell me if a steel washer will work in place of a ferrite toroid?

Thanks.

Offline WilbyInebriated

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Re: Joule Thief 101
« Reply #41 on: November 25, 2009, 05:12:44 AM »
a toroid is not required, you can wind the coils on a rusty nail if you want to. i would also add that you don't even need a core. i have a joule thief that uses a air core crystal radio coil, i have one where the coil is wound directly onto the body of transistor.

Offline broli

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Re: Joule Thief 101
« Reply #42 on: November 25, 2009, 05:17:17 AM »
a toroid is not required, you can wind the coils on a rusty nail if you want to. i would also add that you don't even need a core. i have a joule thief that uses a air core crystal radio coil, i have one where the coil is wound directly onto the transistor itself.

Lol those are some extreme conditions, I was sort of starting to think that a JT needs luck. It makes my joulethief, was pretty close to generic specs, which didn't work look bad. But I'll retry when I have the exact parts and some electronic equipment.

Offline topothemtn

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Re: Joule Thief 101
« Reply #43 on: November 25, 2009, 05:18:35 AM »
Thanks for that info. It will make making the coils alot easier.

Dick.

Offline resonanceman

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Re: Joule Thief 101
« Reply #44 on: November 25, 2009, 05:43:48 AM »
I was planning on adding  a few more posts  but my internet connection  was so bad today I  had trouble  just  getting here to read .......  I  have several  double  posts  to deleate because  the page timed out after it uploaded the  page but before  it loaded  the new page .




gary