Joule Thief

[xee2]

@ gadgetmall

Thanks for the pictures. Can you give some battery drain readings? You seem to be doing this at very low current.

[gadgetmall]

@ gadgetmall

Thanks for the pictures. Can you give some battery drain readings? You seem to be doing this at very low current.

Thanks . Its high still in my opinion but its a darlington transistor and not tuned with a tank . close . 69 ma @ 1.2 volts using 1.5 k on the base with a 104 cap across . i'm shooting for the current draw of a normal jt of 14ma or thereabouts with the HV output . I am pretty sure i can do this but this thing needs to be in a cage   
Gadget

[xee2]

@ gadgetmall

Wow! That's great. It is amazing that you are able to light the fluorescents that bright with only 69 mA. Good work. I am looking forward to your future posts.

[xee2]

I increased turns on collector coil and was able to light fluorescent tube with only 50 mA but it is not anywhere near as bright as gadgetmall was able to do.

EDIT: added alternate circuit

[jeanna]

you do not have 62.5mA at the pickup coil(s).
i am assuming your mA values are taken from a resistance in series with the battery and are not values taken from the pickup coil.
a step up transformer rise the voltage but lower the amps.

@NOP,

You are right. I forgot. I don't have a light so I think it is going through the circuit.
It is ma wasted by the transistor but not being used in the circuit.

@xee,
Thanks for reposting this ckt.
I don't have room for 10 but it would be easy to modify the 3T,4T,92T to be closer than it is to 2T.10T. I will double-check to see if I NEED the 3 and 4 to start up the oscillations in the toroid, or if 2 and 10 or 6 can do it I have all the parts you describe.
My toroid is smaller in diameter, though. I actually think this is a problem.
It is less than 1 inch.

jeanna