Joule Thief

[jeanna]

But, when you put an LED between the two pickup coil leads (or anywhere for that matter) the LED will act as a voltage limiter and limit the voltage to about 3.5 volts.
...
. So I guess the answer is no.

Thanks xee,
That is exactly what I meant. It is too bad. I was trying to peek into the frequency and voltage across the secondary by using another coil turned around the same toroid. I only got a peek, because I could only get a general gauge of the shape etc of the wave.

I wonder if I used the 2 exactly paired halves of an mk1 and read across one half and used the other half for the led. I wonder if I could see any difference from the coil output. who knows what it would be so, It still would not say much.

thank you for that answer,

jeanna

[xee2]

@ jeanna

I wonder if I used the 2 exactly paired halves of an mk1 and read across one half and used the other half for the led. I wonder if I could see any difference from the coil output. who knows what it would be so, It still would not say much.

All of the coils are very tightly coupled to each other by mutual coupling. Anything you do to the load on one coil is going to effect the other coils.

One of the voltages in your data matrix is 140 volts. That should be more than enough to light up your neon bulb.

[stprue]

Do you have firefox 3. something?

"Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9.0.6) Gecko/2009011912 Firefox/3.0.6 "

I couldn't use camino even tho it is the same gecko engine.

It is the only one that seems to work, and maybe you need a pluggin or 2. I loaded this months ago but never turned it on til last night cuz camino was working fine.

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@xee good. I am glad to see this.

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Right. go half way around or less because the primary is in the way. then turn around and go back down.  - that is half. This really makes a difference.

I see you have good voltage, Is that 195v?
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About the resistance.

Make your life easy put a 1k pot or even a 5k pot in there. This way you can turn it til the light brightens or til the voltage goes way in one direction etc. then you pull the battery and see what the resistance is.

The power transistors are not necessary, IMO.
You need a switching transistor. It is OK to use a power transistor, but the thing that makes this work sooo well is the high frequency of the pulses.
I am sure about that now.
The 2N3904 and the 2N2222 both are able to switch 200M times (? could that be? I think so.)

jeanna

Thank you for the info's Jeanna, I think I understand everything.  On the set up you see I am using a 500Ohn POT but it's out of the pic.  195v rectified which really isn't to bad considering that it is not wound correctly.  It is still capable of llighting neons and leds on either polarity.

Thank again

[stprue]

That is some excellent voltage you are getting out of that.  I would bet my earth battery would power it.  I really need to start winding like you guys are.  I am still using the "standard" JT.  How much was that large toroid?  I think Jim said you could use the 2n3055 which is what i have used on both my Bedini motors.  I don't recall how much voltage it takes to run it but probably more than the 3904 or the 222.  I can't wait to see what that baby will do.  Nice work.

Bill

That particular toroid is 3.38", is from www.allelectronics.com and cost $3.50 each, I purchased 4 so I hope they work good.  You should definetly start winding your coils in some form of the Mk1 styles.  My next one I will document closely and post.  As for your earth battery, well I bet it would light that rig of mine.  I Would like to know more about your exact set i.e. cost materials and where you purchased from.  Between these 2 techs even currently we should be able to light our houses for free!

[stprue]

@stprue,
It looks as though you have been to the same shop I went to regarding that nice black/grey toroid.
I am getting function out of mine, I look forward to seeing your results.


@all,
OK, does any one here have the foggiest idea of what my experiments with the Joule Thief are leading up to? I have had 1 nibble, no one here has asked, why am I'm tying 7 torids in a Series Parallel configuration. Did you all miss it?

jim

I have a feeling I will need to buy more wire before I start the big toroid.  I remember you post a high voltage/high amp diagram w/like 8 to 10 coils, You have started your construction haven't you?