Joule Thief

[stprue]

yep it did lite the flro but i BLEW UP  my coil ... lol

made you a youtube video ...

BULB WAS BRIGHT WITH OUT TOUCHING IT ...

got some arking now lol

here is the video

http://www.youtube.com/watch?v=psRWo7wwtK0


ist!

Thats great stuff.  Now make the spark intentional and see what we can do!

[jeanna]

@ jeanna

You will probably need to increase your base resistor value for the EB because it can not supply much current.

Oh darn,
I just soldered it up and got it out there and no go. I can look right into the yellowish phosphors.

@All,
Has anybody ever make one of these light withOUT a cap in parallel with the battery?
Bill, I don't think you did
Jim, I think ditto,
Anybody else?
Gadget, a battery cap?

Before I went out I found the very dead duracell which has never recovered from 0.61v which I keep for this purpose, and it turned the led right on.
The dmm says there is 0.983v today.

I will resolder it with a higher value resistor, if that will make it work without a cap, because that would be worth knowing. Otherwise, I will redo those diodes from the other night.


thanks,

jeanna

[xee2]

@ jeanna

I do not have a power supply so I can not set the voltages I use. Like you I have to find a battery with a low voltage. But there is another alternative. Put a variable resistor in series with a good battery at the positive end and adjust it while hooked up to JT until the voltage between the negative end of the battery and the positive end of the resistor is 0.35 volts (or what ever you want). Then change your base resistor and readjust the variable resistor in series with the battery to again get the correct voltage. A bit of trouble, but may save you time in the long run.

EDIT: variable resistor should be 0 - 100 ohms

[Pirate88179]

Oh darn,
I just soldered it up and got it out there and no go. I can look right into the yellowish phosphors.

@All,
Has anybody ever make one of these light withOUT a cap in parallel with the battery?
Bill, I don't think you did
Jim, I think ditto,
Anybody else?
Gadget, a battery cap?

Before I went out I found the very dead duracell which has never recovered from 0.61v which I keep for this purpose, and it turned the led right on.
The dmm says there is 0.983v today.

I will resolder it with a higher value resistor, if that will make it work without a cap, because that would be worth knowing. Otherwise, I will redo those diodes from the other night.


thanks,

jeanna

Jeanna:

Not to my knowledge but think about it.  Even a small led still needs 3+ vdc and some mA's, like maybe 20 to light and the simple EER that a lot of us have done do not output that high.  This is why, of course, I went with the JT on the EER (Earth Energy Receiver) for the high volts as we all have learned here, the leds like volts if high enough and do not really need mA's.  Now Kapandze can fry thousands of leds I am sure, ha ha.

Bill

[jeanna]

Good idea, xee2.

Thank you.

I just made the alterations on the cap with diodes, so now, I can do this excellent plan... when it cools a little.

I do remember gadget using very high resistor values.
Maybe the fact that he used these transistors is the reason it worked so well for him.

Thank you,

jeanna

EDIT
Light's out.
So, the 4 watt stayed on for exactly 6 hours 10AM to 4PM
I will measure the kill voltage (edit .935v on batt when light went out) then switch to the plain solenoid style for some long burning.

j