Joule Thief

[innovation_station]

much like tube amps eh yucca... 

1 hand in the pocket!!

i dont know what your all playing with but why not use the 5kv flyoff  or the 30kv flyoff 

i have taken flybacks apart b4 ...  and they are a treat!!   

there are hv caps in them and hv diodes...   so dont touch it!! 

i dont see why you couldnt use this as a supply for the MAC  coil ... 

same darn thing...   

basically you fill up the cascade ...  only 10% can drain through the gap ...  so your only ever filling 100% the first time ... then you only replace 10 % in each pulse....  but getting the speed and voltage of 100% ALL THE TIME...

same as my pulse motor that accelerates ...  the more i take from it the faster it will run..
the distance of the gap sets your timeing ...

o the million ways to do it ..  but right what are you doing ..  harvesting the kick ...  every tube tv operates like this by original design ...  overunity right out of the factory ...   same with tube amps ...

i have a big tube amp ...  a few hundred watTs  hifi  up to 32ohm and down to 2ohm ...  the thing weighs bout 50lbs ... it has the amp built in it and 2 aux power pluggs too ..... 

and the darn thing runs on a wire thinner than my head fones ..  that plugs into the wall ... 

i saw it and said ...  no way in heck it is drawing all the supplyed power from the ac mains through that TINY CORD...   

of course not ....  ITS OVERUNITY FROM FACTORY TOO.... 

LOL

IST!

[resonanceman]

@ Mk1

I hope you have better luck than me in figuring out which pin goes where. I bought one like Yucca's because he had already done that. I always ended up very confused when I tried to work it out.

Xee

I  just   check for continuity between all the pins.

I use  a marker  to mark  the  pins  that have continuity .

Then I  check for  resistance.

The   winding  with the lowest  resistance should  be used  for transistor  base .

If you have continuity   between  more than  2 pins  you  may  be able to   use a pin  as a center tap  ........


gary


Edit

I just  looked at my  flyback transformer   again
I made a mistake  on  my last  post .

I  have the    JT  connected to  pins 1  3 and 4      pin 3 is  like  the  wires twisted together on a normal JT   
My secondary is   pin  10  and   the HV  wire

[xee2]

@ resonanceman

I  have the    JT  connected to  pins 1  3 and 4      pin 3 is  like  the  wires twisted together on a normal JT   
My secondary is   pin  10  and   the HV  wire

Great. It seems you have something working. Are you biasing with a single base resistor? What are you using for power supply? Yucca said he had problems hooking it directly to a power supply. Have you tried that?

[resonanceman]

@ resonanceman

Great. It seems you have something working. Are you biasing with a single base resistor? What are you using for power supply? Yucca said he had problems hooking it directly to a power supply. Have you tried that?

Xee

I have not  done much with  my flyback JT  for  a few months .

The  picture  is my  flyback JT  driving  my 90 LED array
As  you can see  I am  using one  AA battery ..

I have also  lit  a CFL with it ..... is  I think  25 watts .......  it is  supposed to  replace  a 100 watt  bulb.    It lights to about half  brightness with one  AA.

I  stopped   using  this   JT mostly  because  I   burnt  up  enough  stuff for a while .

I  tried  using an ignition coil   for flyback   with this   JT .......  it worked well  .......I did not   burn up my  array .......but  I did  hear  a sparking  sound ......then noticed that  where  2 wires  of my alligator  clips   crossed ......the  electricity  would arc right  though the insulation .
I think the only  thing that  saved my array  was  that I left  the electronics   on it ......  these particular  electronics   allow it to light  very easily   and   lights the LEDs dimly at low  power .   The newer   units don;t  do this .   
I think  the caps in the  electronics  buffered  the  HV pulses   and protected the  LEDs.


About the  base resistor .
I made  up  a board   with   connections   for a  3055  transistor  and a pot .
I have used this  board for almost all my JTs for months .


gary

[xee2]

@ resonanceman

I made  up  a board   with   connections   for a  3055  transistor  and a pot .
I have used this  board for almost all my JTs for months .

Thanks.

I measured spikes over 200 volts between collector and emitter on my circuit (lights 2 neons in series but not 3 in series). This is well above the spec for the 2N3055. But, I guess it is OK to use a 2N3055 since you have not had any problems. That is good news since they are easier to get than the MJE13007.