Joule Thief

[AbbaRue]

I was thinking BIG.  Maybe a 100 Watt Joule Thief. 
But even for smaller power units, no more fear of burning out the transistor while experimenting.
The tab type of transistors are much easier to heat sink as well. 

[timmy1729]

@All
I was wondering if we could get more power out of a Darlington transistor setup, using Power Transistors.
http://en.wikipedia.org/wiki/Darlington_transistor
One reason for using the smaller transistors is they have a higher hFE factor then power transistors.
But the Darlington setup will take care of this. 

Interesting. I have been taking parts from an old PC power supply. I've gotten a dozen transistors that seem to be a European BCE config and one or two that seem like they might be power transistors, but I don't know. They could be voltage regulators or something else of which I have no idea. I can post a picture of all of them if that would help. Maybe they could be used to try this idea.

Here is the datasheet for one of them: http://www.datasheetcatalog.org/datasheet/fairchild/KA7905.pdf
It seems to have that Darlington setup inside. There is a schematic in the pdf.

I'm still trying to get my head around electrical terminology so bear with me. What is this designed to increase? Voltage? Amps? Something else 

[xee2]

@ timmy1729

If you Google the part numbers you will usually find a data sheet.

[timmy1729]

@ timmy1729

If you Google the part numbers you will usually find a data sheet.

I just edited my post as you were writing. 
Thanks for the hint, though. 

[timmy1729]

@All
Has anyone tried any of the improvement configurations for the original JT that you can find online? I've seen one that simply adds a diode between the transistor collector and the LED positive and also adds a capacitor between the legs of the LED. Anyone get any improvement through simple things like this?