Joule Thief

[jeanna]

Hi guys today I built a JT with a 7/8" toroid on Xee2 schematic it's about 10T base 80T collector and it's lighting a neon with a 9v battery.
I would like to use this to charge my laptop battery but I'm afraid that I would do harm to my computer. maybe I should monitor output voltage to it first
Anyone tried this or it's to risky?
Thanks

It is pretty risky.

Maybe you should get a battery from the thrift store first and see.
In any case, your battery will most likely be fine, but DO NOT have your computer any where near it when you are doing this OK?

Last year when we were first playing with the HV from the fuji cameras, several of lost our computers or HD's. It could have been coincidence, of course (, but it sure was a coincidence!)

If we don't hear from you for 6 weeks, we will wonder what happened.

jeanna

[Pirate88179]

zhak:

Welcome to our group here.  I am sure that your English is better than my Russian.  I look forward to seeing your experiments and results.  Don't worry about the language barrier, we will get around that the best way we can.

Welcome.

Bill

[innovation_station]

i have lap top batteries im digging out i have 12vdc deep cycles .. and 12vdc lawn tractor batteries ...

i will add to my LOW VOLT END    we shall test it and see wich performs best! 

to drive my invertor to drive my UFO! 

THANK YOU !

H

WELCOME TO ALL NEW VIEWERS!   AND SPEEKERS ALIKE!

btw i already know it is too heavy to get off the ground! ...  but i had to part with my alien caps to square up old debts!   but i guess i first had to build it from junk  just like last time ...

and prove beond 1 shadow of a doubt public ... 

b4 i get the gold to move down the tracks ... 

i have done so ! 

i pulled out 2 deep cycles 2 lawn tractors 2 laptops ...  and 1 more amp ... tube of course ... 

fender at that!  : )

[xee2]

@ jeanna

Xee2,
Kooler is using a small type transistor.
Did you see my tests from last week?
I made a small attempt to look at the battery use (amps draw) by different circuits and showed to my satisfaction that the TIP31 has a much greater amps draw even when the circuit is totally empty.
Yes, I know the draw goes down when there is something it is driving, but this was to see why I can only get 5 1/4 hours out of a AA no matter what it is lighting, and to say that the transistor makes a big difference in the ampsdraw.

jeanna

Using the MPSA06 instead of the TIP31C droped the current in my replication circuit from about 0.03 mA to about 0.01 mA. So I seem to be getting the same (or better) results as kooler.

[jeanna]

Good,
-----
Now, would someone please explain if it is OK (not too dangerous) to put a cap somewhere and a resistor and get some warmth out of the end??
How much,  and parallel or series?

I burned 5 fingertips after I tried to charge my bcap from touching the 12v leads . I am sure gadget forgot to mention the resistor, but I need to know all the details because I am new to things like this.

Can you explain it, xee2?
or someone??

jeanna