BWJT

[stprue]

Nice one Kooler, I'm working on my version of your BJT event thought at this point it is a lot different and more designed as a oscillator.  I need to run a few more tests to see if it can last the night without draining the cap I'm using and then I will finish it.  Any new news on your VTA?

[kooler]

stprue
i haven't had a chance to get down to my makeshift workshop..
i just been posting some old stuff..
but i will update you as soon as i get down to the foxhole.. hoping very soon

robbie

[stprue]

Sounds good, hope the back is healing up!

[jeanna]

Hi robbie,

Thanks for starting this thread.

I see by your corrected drawing that you have added only one inductor at the negative side of the battery.
Is this right?

I am interpreting the 20T and 30T inductors that branch out from the collector to be the usual bifilar coil of the jtc.
So, did you change this?
[I saw earlier that you said there was a 100uH inductor on each side of the battery. I guess you were counting one half of the bifilar as the pos inductor.]
I want clarification please.

Thanks so much... this is terrific,

jeanna

[kooler]

jeanna
i am posting a diagram of my best running bjt.. probably shouldn't have called it a bjt but i built this circuit thinking about a way to improve the joule thief and this is what i came up with..
as for the bifilar turns. it doesn't seem to matter as long as they don't cancel each other out..
but the bifilar turns do the best job..