Joule Thief

[Pirate88179]

Thank you Gadget, I appreciate that.

Bill

[jeanna]

Hi everybody,

@Ist,
Is magnetics the company you found and ordered from the other day?

I actually think we did have something to do with this. When lidmotor "published" allelectronics on youtube  as where I got the biggo I was glad I had bought more than one.
It did come from magnetics, but there is no info that came with it.

@Bill and all
I cannot follow the reasoning with any of that formula so I will wrap mine with 8 turns and let you know what I find out, as that will be the 'A' value.
or
Maybe an email to allelectronics will answer the specs question.?? ?? I hope.

I do not think the 3.38 inches is the necessary part.
I know the voltage does not need to be 985v!!
It only needs to be above 450v,
and  I got 411v with a one inch toroid this summer and lit a 4w 4" tube.
So, please no despair ...yet.

I think most of the effect has to do with the better transistor.
I just got home and I will be doing some tests on different toroids with this transistor, and the tip31 which both xee2 and stprue have used to make high voltage circuits.
So, I will report.
EVERYTHING seems to be closed now, anyway. No shipping til monday, my bank's computer has been down for 3 days so no money ... All I can do now is play.

jeanna

edit
@Gadget,
This is great!!
Please tell me some kind of catalogue number so I can cross reference.

thank you,

jeanna

[xee2]

@ Pirate88179 & jeanna

There is a lot if information on the toroid at the manufacturers web site but you do have to hunt around for it.

http://www.mag-inc.com/

[jeanna]

Thanks xee2,
I was there yesterday, but I was unable to find a starting point of reference.
The tor-60 was not one of their numbers, because they discontinued it, and the dimensions 3.38" are no longer used for the same reason, and I don't have enough info to start.

You were the person who wrote way back what the mu value for this toroid is.
I did not save that,

I am glad you have shown up today.
What is the mu value for that bog toroid?

thank you,

jeanna

[broli]

I just built a joule thief with these specs

pnp c327 transistor
5kOhm resistor
2cm OD toroid core from microwave oven
primary: 11 windings for JT
secondary: 21 double stranded wire windings hooked in bifilair way

I don't have a LED across the transistor since I only have one and I hooked it to the secondary.

The result when I hook a 1.5V battery is that the LED lights up but not as brightly as I have seen from other people. But this is an initial working setup since the first failure I had. This circuit is quite touchy and everything needs to have the correct parameters to get the most out of the LED, but how those parameters relate is beyond me.