Joule Thief

[jeanna]

@MK1,

Did you ever save the pages of your posts on the results you are getting with the MK2-8?

It will save me a lot of research time if you already have the pages marked somewhere in a notebook or something. My most important and amazing results were all in january on pages 108, 168 and 171. It was after that that you made the MK2 and beyond.

I am hoping you can save me a bit of eyeball use, if you know what I mean.

thank you,

jeanna

[Mk1]

@Jeanna

I wish i did , but no , since its all saved in there , and i have a good memory , but what do you need.

Mark


Edit Btw all i have most of the power sup type of toroid , i can test the and help get good results.

The mk1 2x 67 volts on 24 turns , 8 jt turns, to many turns to get tuning done and lowers the turn ratio 2n3904 1k

mk2 4x80 to 120 volts 22 turns 22 awg, tuning resistor , 4 jt turns helps get the voltage up 2n3904

mk8 16x 85 to 140 volts , 27 turns 30 awg 8 wire twisted into one , tuning resistor , 4 jt turns helps get the voltage up 2n2222

The 2n2222 gives a better out put , i am not sure if its connected properly , the base is the same , i usually test both with the trimpot.

But first know your toroid . then get a good design.

If it need 20 jt turns to work good then to get the same voltage out you need 20 turns pickup coil, but 4 turns on the jt side and 20 you 5 time more.

But there is as much power in the pickup coil then the 2 jt coil , i know the amps are low but it still 1.5 volts in 2 coils so the power factor is 3 volt , the toroid and freq will do the rest .

[innovation_station]

the mk8 is all done 

here is a pic of it


ist

almost 1/4 way  done the MK HV!

[TheNOP]

@jadaro2600
you must really ask yourself what are the differences between your needle and iron coil setup.

the most important things are the number of turn and the connections way(ccw/cw).
the reason i say this is that i can't believe the differences between steal and iron can produce so much discrepancies in the results you can get.

[jeanna]

@MK1
I just read your reply on your profile page. I thought it would be shorter. I read all of Bills summary thread and he is up to the MK1.

I guess if you could tell me the conceptual changes you made to the MK1 that increased it stepwise, I would not need to repeat your steps. (unless to replicate)

Did you ever go higher than the original 7 turns on each side of the toroid? I think many of yours the number of jt turns went down as you tuned them. Is that so?

And did you always make the pickup coils in the first up then down way?

Did the pickups ever cross over each other? If they did, did it hurt or help?

I remember something like always have the ends at the place where the jt ends are. Or something like that? This would mean that many pickups would cross over each other.

Any other principles you can think of?

thanks a lot,

jeanna

@IST

the mk8 is all done 

here is a pic of it
ist

Thank you for that pic. You just answered a couple of those questions!

thank you

jeanna