Joule Thief

[TheNOP]

Just out of curiosity,

Has anyone use both an NPN and a PNP transistor in thier JTC?   ...didn't someone try this a while back?

yes, relatively early in the tread and resurfaced later.
soory i don't remember at what pages.

here the early attempts
http://www.overunity.com/index.php?topic=6942.msg161197#msg161197
http://www.overunity.com/index.php?topic=6942.msg161429#msg161429

[jadaro2600]

@Mk1,

The NTE brand is actually carried locally - and the price jumps just that much too, It's like pulling teeth trying to find the right thing in their store though.

I found a few that might do the trick though: 2N5550, the TIP49 or the TIP50.  The TIP's are particularly interesting.

Could you please explain the meaning of the terminals?; I've read about mosfets before, but I don't quite understand why I would want to use that over any of these.  Is there some benefit to the use of a mosfet over a bjt?

@TheNOP,

Thank you for that, I might try one of those setups later; I do have a few inductors laying around.

[Mk1]

@All

I am tying to power a jt circuit with toroid and addition coil ( actually the mk4 ) , with a mk1 , first i just connect a 1 turn and it works a led in the regular mk4 spot. since the design of the mk4 with 2 transistor pnp and npn it only works one way , but if i reverse the pickup coil power and turn the led it also works . The mk4 is a bit strange since you have 2 jt reverse polarity if you power only one side both sides led light.

Mark

Edit , i really don't get how i can power one unit with the other on one turns , 4 turns , also works , and no rectification ,

so i could have one to the battery and 10 connected to it easy then do it again , and then get some , all that on a single pulse , of what the hell is that signal.

[electricme]

@all
OK, I just began treating the skin cancers on my left arm with MMS   
Dosage 1 drop of MMS to 5 drops activator
I used a long match stick to apply the mix to my cancer spots.

It will take time fto notice any reactions, days to weeks, so all be patient.

Now it's back to reading posts 

jim

[altrez]

@electricme

I hope everything is ok with your skin cancer! I will pray for you!

@ALL

Here is a picture of my new JT it will power 32 leds from my old AA battery. However i can not get a pickup coil to work. The mag wire in the picture is what I am using as my pickup coil. I have tried 1-30 turns no luck. Any ideas?

I do not have an LED attached to the transistor I tested the circuit by touching the leads from my led bank to the transistor and it lit them very bright.

Thank you all!