Joule Thief

[jeanna]

Here is the description in its own separate post.
Perhaps anyone interested should copy the text and keep it for reference.

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This secondary is something I derived from using the MK1 style, which I have always liked a lot.
I was thinking of 3 phase one day and wondered if I used 3 directions of winds (which is the MK1) and made each segment a multiple or maybe exponent of the first, if I could get 3 phase.

The answer to that was no.

But, what I did get was about twice the voltage from the same number of turns.
I must say I have had really high volts before, but they required a very specific set of elements (to be at resonance) and would quickly degrade and the effect would be gone.
So, one of my criteria is that the bandwidth be wide enough to take a change without much loss.

So, to make this secondary which has a total 84T.

This number is divided by 7, so 12T go into each segment. Or, x=12
You will always wind (turn) around the toroid the same way but your progression will change.

Start a little to the left of center and wind 12T progressing to the left (actually 13 turns to give you 12 spaces.)
Proceed to the right carefully placing each turn into the 12 spaces. Continue 12 more turns to the right (again add one).
On this final lap you carefully wind 4 turns in each of the 12 spaces.

So, you end up in the center. You can keep the extra 2 or take them off, but I keep them because I usually lose count anyway.

On the big golden toroid (JLJL) I made x=30T but instead of 4T in each space of the final lap, I used 8T ... for a total of 330T for my secondary. Wow, I put the scope away at 1400volts!

(MK1jeannaHybrid)

I hope this helps.

jeanna

[tysb3]

Hi
somebody try to connect cap to base coil ?
cap bright up led with high value of base resistor.
I think with cap we can reduce base curent.
in picture it is what I test.

[innovation_station]

comeing up next is the tip 122 and 127  matched pair ...  npn pnp  gain 1000 each !


how many you want ? 

lol

http://www.fairchildsemi.com/ds/TI%2FTIP122.pdf
http://www.fairchildsemi.com/ds/TI%2FTIP127.pdf

any ways i went full 18 3055's on my last board ..  ill add pics in the next few days

im removing the high teck darlenting npn and pnp pairs .. and remounting ..  then i will make some identical j coils ..  and feed em seperatly and reconnect along the way!

w

here are a few pics ..
last one HANDS UP THERE PLAYING MY SONG!

THROW YA HANDS UP! PUT EM IN THE AIR ! ROCKING WITH ME LIKE YOU JUST DONT CARE !

http://www.youtube.com/watch?v=n3omJHqx2bo

H!

[xee2]

@ tysb3

Hi
somebody try to connect cap to base coil ?
cap bright up led with high value of base resistor.
I think with cap we can reduce base curent.
in picture it is what I test.

Yes. Quite a few posts about this a long time ago. I do not think we ever figured out exactly what the capacitor was doing (due to lack of scopes). But the results were higher CE output voltage at lower currents. Doesn't seem to help much when using a pickup coil (3rd coil).

[jadaro2600]

I was wondering, here, if since we use voltage to primarily light a CFL, ..wouldn't it be interesting to fix a twist bulb in acrylic, so that a constant thermal gradient can be held.

I'm thinking that a large component of the light emissions may be sustained by the current producing additional heat, and therefor a heat insulated CFL would produce more light if it were thermally insulated.  Perhaps this clear version would move heat transfer away from the glass tube

Just a thought.