Joule Thief

[kooler]

nice
i know those big leds are bright

off subject for abit but jeanna where you get your induction meter
i am going to try to build something like the hendershot motor soon
hendershot and stubblefield combo
i thinking my problem with my crappy output is due to my quessing the henry of each coil

i dont have much tools .. i just started learning electronics for about 10 months now

more to come,
robbie

[forest]

Maybe a stupid question, but I dare not to read all 933 posts before asking : did somebody tried to close loop joule thief of any mod of it ?

[jeanna]

...

off subject for abit but jeanna where you get your induction meter
i am going to try to build something like the hendershot motor soon
hendershot and stubblefield combo
i thinking my problem with my crappy output is due to my quessing the henry of each coil

MCMelectronics.com
Tenma 72-8155
http://www.mcmelectronics.com/product/TENMA-72-8155-/72-8155
It ended up costing $65, with shipping $52.95 +12.00 I think. I think it was well worth it because I was stuck. It helped to unstick me.!

I better find out what a hendershot motor is. I haven't made a bedini motor yet.

BTW I believe your results have to do with lack of ferrite core. It shows up on that meter as amazing.
Even iron is lousy next to ferrite, but as you will see with stubblefield (Yeay another person interested in stubblefield!) you can use soft iron.
If you really do not want to use ferrite, perhaps you could try an iron wire.
I got some black annealed iron wire at my hardware store when I made my stubblefield coils, and it shows a stronger inductance on the meter than air but still much less than ferrite.
You can also use a spool of tie wire for rebar. It comes in a spool about 4" diameter.

It would be interesting to see your big set up made with part or all iron wire for the core.  I would be very curious to see this.

====
@forest

did somebody tried to close loop joule thief of any mod of it ?

What is that?
Maybe xee2 did, if it means joining the secondary to the battery?
I better just wait for your answer.
thank you,

jeanna

[kamax]

Hi, i have found a strange effect with my joule thief. Maybe it's useless but..well.

I have connected my earth cell in a pot to my joule thief but the power was not strong enough to light or blink the led as usual. So i wanted to shortcut my resistor with a wire and when i have touched on side of the resistor, the led has blink. It was the side between resistor and base transistor, the other side don't work.

I have take my camera to make a video but i note that i need to wait some minutes to do it again. Probably the time the capacitor has enough energy. And while moving the joule thief around to find if it has something to do with the joule thief on the soil or not, i note that if i shake it, it just "recharge" faster.

I think when i connect the wire, it pump some energy from the capacitor. The other side of the wire is connected to nothing.

Here is a video: http://www.youtube.com/watch?v=qol7zbG7loM

[xee2]

@ kamax

Where is the capacitor? Is it where the battery would be in a normal JT? What value is your capacitor. Thanks for posting this and the video. I assume that there is no battery so that you are actually getting free energy from somewhere (maybe your muscles when you shake it). Do you know the kind of toroid you have. I would like to try to duplicate your results.