Second Stage Joule Thief Circuits

[jeanna]

@Jeanna

I still am unsure of the best permeability , for the jt , but you need big flux.

Hi Mark,
Yes...

I just found the source for the tor-60. The ones I got were taped to  a cardboard with magnetics name printed on it.
The toroid I used for "jeanna's light" is not in their line anymore.
I suspected that when someone said allelectronics was out forever.
Allelectronics buys overstock and remaindered stock.
Wouldn't you know?

The part I want to report is that 900u is the lowest permeability of their stocks which go up to 10ku.

This doesn't exactly narrow it down, but it does help some.
The failures I had were 60u and 120u.
Anyway, if it is a ferrite core- and it is- and it came from magnetics in AR, then the lowest permeability  is 900u.

I ordered a new toroid from allelectronics yesterday. It is half the OD of the biggo, but it is still bigger than the .86" one and that .86" one did light a 4" fluoro tube, which makes me hopeful that this newest one willlight a bigger tube.

In fact I am planning to try that one from last summer with a new transistor, because maybe the problem lies there. I just got a tip3055 and a tip31. Both have been used successfully by members here.
And Gary also just confirmed that for him the tip was way better than the 2N, so...

I will report.

jeanna

[MrMag]

im gonna post the last scope shot look hard at it ....


i see a ghost being sent to work ...


no joke... 

quantum viewing from my freqin o scope 


OMG!

LOOK HARD JUST B4 THE RIGHT HAND TRANSPORT ... 

W

HOW FREQIN CRAZY IS THIS WORLD ............ kinda makes ya wonder.....

I enhanced that scope shot for you so that it is easier to see the image

[innovation_station]

i guess you dont like my coil ...



then you wont like this one .......

2.6v dc to 120vac CONVERTOR

[broli]

In fact I am planning to try that one from last summer with a new transistor, because maybe the problem lies there. I just got a tip3055 and a tip31. Both have been used successfully by members here.
And Gary also just confirmed that for him the tip was way better than the 2N, so...

I will report.

jeanna

When I googled that transistor I stumbled upon this...

http://www.talkingelectronics.com/projects/FluorescentInverter/FluorescentInverter.html

Look like another JT in disguise. It also includes a lengthy explanation which might help beginners like me.

[Cap-Z-ro]

"  256.JPG (135.42 KB, 640x480 - viewed 13 times.) "

IST...it appears that your scope has somehow been transformed into a time machine.

It looks like you have tuned into a past broadcast of the 'Tonight Show'...you can clearly see Steve Allen's hairpiece as it sits above his ethereal head.

Regards...