Joule Thief

[xee2]

@ Yucca

I was amazed myself but I was running at 1mA 1.5V using 100 Ohm and 1k Ohm divider network. This transistor needs only a miniscule base current.

I suspect that it was not running at 1.5 volts. I think that your meter readings are ONLY THE VOLTAGE AND CURRENT THROUGH BIAS RESISTORS, TRANSISTOR IS NOT TURNING ON.

[innovation_station]

ok got it ...


MUST USE FEROITE AS A CORE TO ELEMANIATE THE HEAT PROBLEM WITH THE SOFT IRON ...

I RAN IT 10 MIN WITH MINIMAL HEAT AT THE COILS...

JUST BECAUSE I HAVE MUCH LESS HEAT I STILL HAVE TONNES OF POWER ... 

MY DIODES STILL GET BURNING HOT ... BUT MY COILS BAIRLY HEAT NOW

SO ILL MOVE RIGHT ALONG TO THE JT RINGS ... FOR MY COILS ...

IF I CAN KEEP MY COILS FROM GETTING TOOOOO HOT I HAVE A SOME PLASTIC I WILL USE TO MOUNT THE COILS TO ..

IST

IM ON IT! 

HEAT PROBLEM ON THE COILS IS SOLVED ....  VERRY LITTLE HEAT NOW



im useing 8 full turns on a 1 " gold mine 14 ga ....  almost no heat at the coil ... still huge ou put

20 min solid run coil is cold  YAY!!!!!

THIS IS THE COIL IM USEING ..  13 " 14 GA ...  IM GONING TO USE 14" 14GA  CUZ IM 14 

IM ON THE 814 COIL     

[jeanna]

IST,
It seems the power supply is off camera.
Let me ask this, please.

Is the neg coming into the bottom of the coil as you drew it, then the pos is on the stick that is crossing the magnets?

Then the carbon makes the very big and warm spark, but the carbon is not attached to anything except your hand?

And, it is not warm anymore?

EDIT
And now, instead of the ring of bobbins, you are using the toroid in the pic with 14g wire?

You move forward with your experiments very fast, and I am not sure if these details from your drawing belong with the latest post.

thank you,

jeanna

[innovation_station]

i do move fast ... 

sorry

most times it is still too fast for my mind .... sheesh

lol

same hook up as the bobbins  same everything just feroite ring core ... 

im putting 8 turn 14" 14 ga AND 8 OF THEM on the 814 coil  now that i have verry little heat from the coils ... 

ist!

ill still build the SG36 ROF ...  but it must be driven diffrently than thease coils ..  so you dont burn it out cuz the heat from the iron core ...  feroite is much faster ..  and it aint all over the place .. that i saw yet

got the 814 all wound and mounted  some pics ..

[sparks]

What might be interesting is to wind the jt on a copper coil.  By controlling the current through the coil the permeability of the core can be altered easily for any given winding configuration or turns ratio.   Will require some input or output energy to change the magnetic saturation parameters of the core but the core coil itself will have some induced energy from the torroidal input and output currents.  Might be interesting to see voltage drop across a resistor to see what happens to the copper coil core.