Joule Thief

[jeanna]

Wow not that I'm home using the mac I cant see any of the pics of xee's I was just viewing at work!  Anybody know what's wrong?

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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So at the end you don't go around the toroid completely and start the overlapping that way?  That's not how I did mine but I would like better results then I'm getting anyway.

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

[Pirate88179]

Wow not that I'm home using the mac I cant see any of the pics of xee's I was just viewing at work!  Anybody know what's wrong?

Is there a place reserved for where the image should be?  If so, right click on it and select "show image"  If that does not work, or there is no image place, your pop-up blocker or other security stuff may have to be reset.  I am using the latest version of Firefox (can't remember the number) and have no problems as of yet. (fingers crossed)  This version just became available like 2 days ago.

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

[electricme]

@Jeanna and Bill,

I am using Firefox 3, I assume this is the latest software.

I'm still having trouble with images of peoples work being displayed, sometimes its OK, sometimes not. I'm putting this down as a download bandwidth problem. 

@ Bill,
I see you noticed that slight problem, ha ha, thank you for your "moderator" post.

@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
 

[electricme]

@xee2
I had a meter problem.

@ electricme

What is the minimum reading on your meter? I suspect that there is current flow but it is too low for your meter to read.

I discovered I had not changed the RED plug lead from the 10Amp setting to the V ohms input on the meter, after I had switched over to the ma setting.

Silly mistake on my part.

Thanks for the enquiry

jim

[electricme]

@stprue

@  electricme

Why not try small transistors for each or a few med. sized one!

Good question, I havent decided to drive the 7 series toroids primaries with a NPN Transistor, Mosfet or IGBT.
With the last 2 items, I need to watch out for spikes which could destroy them, then again, I need to push several Amps through the primary to get the output I need, so I think I will use something in the 20-30 Amp range device, perhaps an IRF540N MOSFET or equilivent device.

Then again, if I decide to drive each toroid individually, then I will use individual transisters.

I have been testing my JT this morning, and not having much luck with turning on a 2N3055, or should I say, use the pulses of the JT at the collector to pulce the 2N3055 transistor on and off.

I added another 1.2v NiCad in series with the other NiCad, but the bulb weekly glows.

If I bridge out the BC548 transistor, between the Collector and the Emitter, then the 2N3055 switches hard on, the 6v globe shines.

I think I need another medium powered transister to switch the 2N3055 on and off with the JT pulses.

I will draw up a circuit and you can see what I up to so far.

Thanks for asking
jim