AC from Joule Thief Secondary/pick-up

[jeanna]

Wow,
This is really cool.
I was filming my last video part 4 in the series to help people understand this circuit when...

I changed the inductor on the 10 leds in series from a 220uH to a 1.39mH inductor.
Now, everything goes without a struggle. Of course it took all day to realize it, but in the end I can now light 2 groups of 3 leds in series from the 21 turn S2 to the same brightness as the 10 leds in series from the 84 turn S1.

Oh good.
Here is a drawing, because I think it is easier to follow than all my words.
If you want any explanation, please ask.


thank you,

jeanna
Edit
I can see now how I can straighten out the lines of the S2 circuit.
I will leave that for another time.
j

[jeanna]

Hi everybody,

This needs a new pic.
I added 2 more leds to the 10 which have 1.39mH inductor.  These are on the S1 secondary.
I noticed when I used a supercap in place of the battery no matter what else I did, the 10 leds I had there stayed on for longer than the 6 on the S2. You can see this  in that last video I made.

I was adding caps to the S2 secondary, and I was getting different effects, but as I say, no matter what I did, those 10 lingered on longer than the lights on the S2.

In the meantime, I kept adding small but bigger and bigger caps across the 220uH inductors on the S2.
Remember, each of these 220uH inductors were running 3 leds.
69pF helped and 220pF helped and took a while to load up the light and finally I added 560pF. But even then that bunch of 10 leds lingered when the cap started to run down.
So, I added 1 then 2 leds to the 10 making 12leds on S1.

Now, they all (all 18)  go on and off together.
To me this means I am not throwing away any useful volts.

And, this is the first time I have even gotten close to the right cap for the job. All other times the cap did nothing.
It is almost as though those 10 leds were absorbing the effects.

I will make a drawing then add more lights until it gets uneven again.

the brightness is unchanged so far.

jeanna

edit
Here is the new drawing. As usual, I made the new parts red.
I saw something odd as I took the data.
The S1 volts went up but frequency remained 111KHz where
the S2 volts stayed the same but the frequency went down to 133KHz.
Here is the new drawing.

[kooler]

i see ya got a super cap in there
will this one work  http://www.goldmine-elec-products.com/prodinfo.asp?number=G17241

i just kidding.. i know its to big... haha ...

[Pirate88179]

i see ya got a super cap in there
will this one work  http://www.goldmine-elec-products.com/prodinfo.asp?number=G17241

i just kidding.. i know its to big... haha ...

That link is to a supercap of 3 farad and Jeanna is using (I believe) a super cap of 650 Farad. (It is like the one I use)

Bill

[kooler]

i know on my air coil jt's if i go to big on the cap on the bat side it stops working
crazy ... huh...