Joule Thief

[jadaro2600]

I was taking measurements off my jtc for voltage, I had a little radio nearby playing and noticed that there was radio interference when I touched a probe - RF popping, but then it would go away.  I know this is natural of electrical signals, but should this be something to worry with?

What if it completely blanked the signal?

What if building a very large one were to create a massive radio transmitter with whimsical broadcast frequencies at unusual wattages and field strengths?

What I meant by 90 degrees to one another was that the normal ferrite core has been replaced with a toroidal copper coil, and this is / was wound as a ferrite core would normally be with the second winding ( voltage collector ) on the outside.

[Pirate88179]

Jadaro:

Have you seen my video on joule thief sounds?  Here is a link: http://www.youtube.com/watch?v=041LPyBJULs

You might find it interesting.

Bill

[electricme]

@Pirate,
I suddenly realised we have 2 bills here now.
Got your PM, no offence taken mate, I accidently pressed the send button, then without thinking wrote some stuff and it wouldn't send, siii
The mouse war is still here, thought it was over.lol

Bill, I have a way you can find out if a fan can be used to be a weather machine 
Get 2 12v dc fans, put one so it will drive the other by blowing wind against the 2nd fan, connect the DMM leads to the 2nd fan wires and see if there is voltage there.
If there is, then it will do the job.
Else take the small CD Rom door drive motor and stick a prop about 12" or more long on the shaft, plonk it all on a weather vane to face the wind automaticly, it will work.

@jadaro2600,
Interference fix.
Get some alfoil, cut it into thin strips and cover the torid with it. Wind the strips as you would wind on copper wire, (1 layer will do) this becames a "faraday cage" keeping any radiated frequency enclosed, make sure you earth it though.

General Jim

[Koen1]

Whoa, what's this ??
Are we starting to move the JT into the direction of the TPU now?

That Tesla patent pic seems to show we are...
Well, why not eh... We've moved from a simple autotransformer to a three or more coil
mag amp setup already,
now with some adjusting it would just be a sort of TPU, wouldn't it?
So, we're going to make the magnetic poles rotate within the core while using the
coils to provide the input pulses as well as collect the output AC?
Great!

I bet IST will have a field day

perhaps it would be interesting to look at the posts in this thread too,
in this respect? http://www.overunity.com/index.php?topic=6734.msg159852#msg159852
(basically that post and those below it, but the one above it may also be helpfull)
Those that have experience with TPUs, Tesla's "spinning egg" toroid, and autotransformers
based on a 2-phase "stepper motor" coil setup, will probably recognise what is said
as old stuff, but it may be usefull to those who haven't read much about that yet.

For now, I am going to assume that is what we're heading towards: using at least
4 coils to induce a magnetic field, switching the coil input in such a phase that
the magnetic field "poles" rotate within the core, and then perform the same trick
as we have been doing in the classic JT of using the coils together as pickup coil
and getting higher voltage pulses out...

So... Am I warm yet? Close? What do you guys think?

Interference fix.
Get some alfoil, cut it into thin strips and cover the torid with it. Wind the strips as you would wind on copper wire, (1 layer will do) this becames a "faraday cage" keeping any radiated frequency enclosed, make sure you earth it though.

General Jim

Yes, I have read about and seen such type of shielding... Although it wasn't on a coil...
It was a wire that carried signals of a specific frequency, and they used strips of aluminium
that were just a little less wide than the wavelength of the signal was, and the strips all
overlapped with each next strip overlapping the last part of the previous.
The reason for that was, as I recall, that this produces a maximal decrease of the em signal
which is now reflected back to the wire and has no chance to squeeze through the overlapping
strips, but also does not induce strong eddies in the shielding either.
Just fyi.

kind regards,
Koen

[innovation_station]

sure ill whip 1 up but not right now 

i have 40 steel pipe cores   5 and 6 "  1/4" thick 2.5 and 3" tall plus a bunch of .5 " keepers 

i have a BUNCH OF 22GA WIRE TOO AND 14 GA 

but im still building the darn last unit lol

im on it tho


i have already maybe 30 -40 rings built similar to that pattend ... but sure ill do it

lol

i think i need a super cap off the jt bridge first then the batterys ... might speed up the charge time .... im useing 2 engizer rechargleable batteries in the jt recovery holder and useing a disposable aa to drive the unit ... the aa rechargeables are 2500mah each ... so they charge but quite slowly

my devider is easly recharged ... but they do drain out might be because the divider tho ...     perhaps it should be switched ... 

i would like to finish this unit correctly b4 i move along ... 

ist!