Joule Thief

[Cap-Z-ro]

I knew the j/t had great potential...thanks Ist.

What is he using to power the bedini motors in the 2nd vid ?

And isn't johnnydarvo a member here...his user name sounds familiar.

Regards...

[jeanna]

Hi All,

I want to finish up this amperage thing.

I checked all my 3 jt's for amperage. Also I tried them with a well charged and also a sort of depleted one - in fact the one that ran the array all night.

I was surprised that there was very little difference in amp draw between batteries.  (surprised because leds take less when there is less to take)

My first jt was the minimalist one where I was looking for the minimum turns on the pick up to see a decent light. It was 20 turns for the array.

This one draws the highest amperage at 0.026A
The MK1 draws 0.021A
The hybrid mk1/jt draws 0.023A (as I shared before)

So, in a way, the transformer rules apply in that the transformer with 20 turns has lower volts and higher Amp draw.

jeanna

[xee2]

@ jeanna

Current is set by base resistor value, transistor gain, and battery voltage. The differences you are seeing may be due to transistors having slightly different gains.

[jeanna]

That is a great circuit. The problem is that it is too dificult to obtain.

Jesus

Hi jesus.

Yes, but we are far more empowered by making something as good with our little toroids and 1 transistor.

No, I haven't lit my fluro with the jt, but I am going to... and more   

jeanna

[jeanna]

@ jeanna

Current is set by base resistor value, transistor gain, and battery voltage. The differences you are seeing may be due to transistors having slightly different gains.

xee2,

Is that true even when the secondary is producing all the energy for the lights?

Anyway, I have it on a breadboard, and it is always the same transistor. And I never changed the resistor The only thing that changed is the battery charge (or the jt I am testing, of course.)

In fact changing the resistor is the next thing on my list of things to change, although I may add another member to this family. I may make another little toroid style jt with as many turns of the secondary as I can fit. Then test them all with different resistor values at the base.

thank you (again),

jeanna