AC from Joule Thief Secondary/pick-up

[Mk1]

@all

sorry double post

[Mk1]

Mark,
I really do not know how to answer that question.
First if you know the answer please just say it.

Second, I do not know the answer because this thing is oscillating, and that means that something has to change a lot. so, I think the one going all in one direction would be a bad choice.
Somehow, I do not think that is correct, but really the best way to make your point is to make it straight.

So, please tell me soon which one is better.

thanks
jeanna

Sorry i was going universal with a picture , Btw is it there ?

If you look at the direction of the field created in the toroid by the jt coils , Look at the arrows  on one side they collide and on the other side they push each other.

I thought the picture was enough but not really so i will not assume this quick explanation , so feel free to ask again , i have a master in art maybe to me images speak louder i guess.

Mark 

[stprue]

@all

Please someone please donate a camera to Mk1, I would if I had an extra!

[stprue]

Yes, stprue,
It does go down in total height of the voltage spike.
I do have an advantage because of the little scope.
I have an opinion that there must be some difference between
_____|_____|_____|_____
and
____/^{^}\___/^{^}\___/^{^}\___/

however I could be very wrong. Maybe with high enough frequency the spikes will come together and be enough.
But here is where the freq/voltage relationship comes in.
While tuning my primary and with the probe clips across the 2 secondary leads, I watched that every time the frequency went up, the voltage went down... and the reverse was true too. I was adjusting the base resistor, and I was also changing things by changing the number of turns.
So, if the frequency gets really high and the spikes are really close together, the voltage will be less too!

Now, back to your question...
You are correct.
The voltage does go down. Last week I got very upset after I had finished winding my mk1 around the biggo.
1/4 around, so up one side, the volts were around 90v. after finishing they were around 70v.
Then Mark just kept saying tune it tune it... so after I got the base resistor down to 90 ohm the frequency was down to 5.6KHz but the voltage was at 450vac. and I lit the fluoro tube for 5 1/4 hours.

OK?
Just have faith... it will be worth doing.

jeanna

I just noticed the pi, sorry I have a mac and the pic's are out of view, you need to scroll to the right to see pic's.  I think I understand!

[jeanna]

Mark,
Thanks but you see, I do not know which one would make a better toroid than the other.


OK All,
I made what is to me a very preliminary drawing of my jt with secondary being used as the ac input for 2 additional toroids.
There are many ways these can be hooked up, natch...

I have chosen to connect the center tap to the lower leg of the BJT secondary.

these will need to have names and perhaps a naming convention, like S1,S2, on BJT1 That would be the ones coming right off the BJT.
So, over on the left you see the BJT1S1 with long lines and lots of stuff.
You also see BJT!S2 all by itself under the big messy one.

Nested within BJT1S1 (the big messy one) would be
T2 the next toroid and
T2S1 and T2S2 being the 2 secondaries nested inside and so on.

T3 is another toroid nested inside BJT1S1.

I will make mistakes typing the names like this so something easier to get right might help if someone can think of one.
Just something to think about.

OK so here is a pic as promissed with 2 toroids nested as I have just tried to describe this.

The numbers of volts and KHz are only as the connections are drawn.

When I made the first "2tier" I found that some wires could connect with others to make a better result. I do not know what will be best. There are a lot of free wires here, and a lot of inductors present to be used.

BTW, all the cores are the same Tor-23 from allelectronics.

XTree is BJT
widow is the first T1 and
RG85 is  T2 over on the right but also connected directly to BJT1S1. I mean it is nested at the same level as the widow.

Let's see what needs to be done.

thanks,

jeanna