Joule Thief

[innovation_station]

bill i do agree

i loosly use the term jt ... 


as most of the things i make are the next thing after the jt ... 

i cant wate to build j's coil and do my trick ... lol

wow it will be wild!

william

[PaulLowrance]

Paul:

But that is a totally different circuit he is talking about.  You just tested a sort of replication of his JT circuit alone.  Again, I know of no one that claims COP>1 for just a JT circuit by itself.  I just want to keep the facts clear here for others coming into our topic. Gadget's circuit for the OU prize is much more than just a stand alone simple JT so, in my opinion, you are comparing apples and oranges here.

Bill

Bill,

Gadgetmall was making a lot of posts on how his Joule Thief circuit could charge the ultracap from such & such voltage to such & such voltage with hardly no drop in his 2500mAh battery, like on the order of a few mili volts. You can dig for his posts if you want, but his claim to how much he changed the ultracap was relatively high. He's made a lot of outrageous claims. That is the Joule Thief circuit I tested. The one with a 1N34A germanium diode, bcap0650, 2N2222 transistor, etc.  Gadgetmall told me I could use a high permeability core, which is what I used. Yesterday I ordered the exact core part number he's using, so we'll see what that does. If it's cop>1, I'll be more than pleased, but I seriously doubt it. The only reason I tested that circuit was because of gadgetmalls huge claims. My measurements showed absolutely nothing close to his claims.

Now if you or someone else has an equally impressive claim, then please let me know and I'll consider replicating it.

Thanks

[PaulLowrance]

Gadget's circuit for the OU prize is much more than just a stand alone simple JT

If that exact circuit is published here then I might give it a try.

BTW, I don't know why you keep saying "simple" JT. The topic is about JT, so I don't see what difference it makes if it's simple or complex. I tested the *only* gadgetmall circuit I saw that he was making big claims about. If that's called a simple JT, then great.

[hartiberlin]

I went back.
I must have made a better connection or else the input battery was dead-ish when I started, because those same 100 turns is making 1200 volts!

Here is what happened:
I had forgotten to measure the amps draw.
[I believe the amps draw is only about the take of the transistor and a measure of how long it is on in the process,
but I dutifully measure it anyway, but this time I forgot.]
When I went back, the circuit just did nothing... then I added a fresher battery and the volts went off the chart to 1200v and the amps draw is around 140mA.

Just to celebrate I took this picture:
twoBrudders 

jeanna

Hi Jeanna,
well done.

So you used only one AA battery ?
So the voltage input into your JT was only around 1 Volts when
running the your JT ?

So it was a power input of less than 0.15 Watts to light up
these 2 CFLs ?

That is amazing at this brightness, although CFLs don´t need much
power when energized by RF pulses, but just 0.15 Watts is really
amazing.

How bright were these 2 CFLs ?
The cameras normally don´t show a realistic picture when
shooting lights. ( at least my camera tends to over exposure)

Were these so bright like normal e.g. 10 Watts range types CFLs ?

Many thanks.

Regards, Stefan.

[crowclaw]

Jadaro:

This is what I have been using for mine:  (sorry for the crude drawing)  I basically copied Introvertabrate's circuit from Youtube.

Bill

Hi Bill,
Just check your schematic... i think you have your batteries incorrectly labeled. The cathode of your diode coming from the transistors collector is going to your battery labelled supply!