Joule Thief

[gadgetmall]

@ All Please forgive me, but I couldn't post a personal message, so I'm asking here...

@ Gadget
Where and when is this Black Hills show?  I live in northeast NE and would like to go!

Its at Earthhaven Eco Village here the link  http://www.earthaven.org/
the whole Village is solar powered . no cell tower no radio stations no tv other than satellite .. They have a deep burried telephone cable . thats all the connection they have with the outside world .


June 30

[jeanna]

I am not sure that you got it yet ..

I do not remember Hazens makiing JTs without  toroids .

You are correct.
I don't get it yet and I thought you were making your tapped spool thing to tune your LM.

sorry.

I mentioned Hazens because I was focusing on the way the thing was wound, more in response to MK1, though, I guess.
Hazens way to wind the primary bifilar is the same as a single wind with a center tap.

My LMs are  wound on  the spools that the wire comes on .
With my first  few coils I just  sanded the enamel  off both ends and  added a  primary .

I guess I assumed you were adding a joule thief inside the spool which sort of makes the spool like a pick up from the joule thief.
I didn't realize this was wrong.

Thanks for the correction.

jeanna

[Mk1]

@ Jeanna

[resonanceman]

You are correct.
I don't get it yet and I thought you were making your tapped spool thing to tune your LM.

sorry.

I mentioned Hazens because I was focusing on the way the thing was wound, more in response to MK1, though, I guess.
Hazens way to wind the primary bifilar is the same as a single wind with a center tap.

I guess I assumed you were adding a joule thief inside the spool which sort of makes the spool like a pick up from the joule thief.
I didn't realize this was wrong.

Thanks for the correction.

jeanna

Jeanna

Sorry ....I  know  it got  a little confusing ........especaly  sense the first thing I did with my coil to tune the flyback was to make a JT out of it     

I only  made that JT  because I realised that I could .

Before I started   my LM coil  I was looking  for something easy and pracitcal .
Something that could be duplicated  anywhere .....even if  toroids  are not available .
What  could be easier and simpler than   just  sanding   the ends of a spool of wire and  adding another  piece of wire for a primary .

That is why  I called it  the lazy mans JT ......it is as easy as it can get

Getting the most out of this cioil  might not  be easy .............but it will always be easier to put   wire on a spool than it will to put it on a toroid



About Hazens   same  direction center tapped ........yes  ......toroid no.

I remember saying  that the  electronic goldmine 5 for $1 toroids  slide into the   spool .......I ment the  enpty  toroids...not JT coils .... that might  be where  you  got the idea that  I  was using the  spool as a pickup
gary

[jeanna]

@All,
I looked at this 2 tiered joule thief circuit again today.

Xee had suggested a while back that one reason I had lower voltage in the second tier was that I had stepped it down with fewer turns.

Using the same toroid for the first tier (widow) as yesterday, I made a pickup of 7 turns and just let the 38T pickup alone.

I connected it to the second tier as I have been doing and an I saw a new pattern.

I wanted to get the lights out of it so I can compare similar conditions, and I moved the wires over to join others ... etc...

The result is a more compact and understandable circuit (a little, anyway)

The results are interesting.

I didn't lose as much voltage as I had before - meaning this is the place to step up or down the voltage... (maybe)

The frequency went up 2 1/2 times from about 200KHz to 500KHz.

So it did not step up the voltage, but it really stepped up the frequency!

I will draw the new circuit, because I will be using it since the lights are not adding to the complication for now.

Oh, the other thing I noticed when I was pulling out the leds, is that the basic joule thief light takes a lot out of and away from the power in its own pickup coil. (I probably knew this in January.)
As the second tier is entirely fed by the pickup from the basic JT on the first level, the effect this light has on the pickup is significant.

I will make that drawing and be back,

jeanna