New comer needs any and all help

[TinselKoala]

Wow u been doin a lot of work lately. I've been trying to play with the jt lately. I want to make one I can hook up to 12v or 9v and get a really high amp draw from.. I have seen many diagrams but can't seem to replacte them. I've seen some on u tube powering big Flo light bulbs. That's really what I wanna try to do they all seem to have three winds. I just can't get it. I've got several toroids wound already some with small gauge few turns and big gauge lots of turns and many other variations. Do u know anything bout that? U help a lot on the motor maybe u can with helping me make a high powered jet. Could I hook a transformer to the out put of the jt? Or what could I do. How can I do this..

Sure, I've been playing around with JTs too. My goal has been high voltage, though. I've not been able to light the CFLs the way some folks have but I'm getting quite good results anyway. I've got a little unit here on my desk, like an executive toy, that lights a NE-2 neon with a "dead" AA battery. Some of my JTs will light a CFL fairly brightly.... but not with both wires connected! Only if I have just a single wire connected to the CFL. It's a matter of resonant frequencies and voltage rise by standing wave resonance, and I haven't hit that critical point yet in my constructions. I've run out of cores!

The thicker wire should usually be used for the "primary" and the thinner wire, more turns, for the "secondary", in a step-up transformer like the JT. Another winding for another secondary or a trigger winding can also be put in there. Winding toroids is fun, I hope you figured out how to use a long skinny "bobbin" that you prewind with wire, to thread thru the toroid hole while winding.

JTs work by taking a low voltage, low current source and "compressing" the energy from that into high voltage, high current but _very short_ pulses, separated by lots of blank, off-time. This happens so fast that it looks like continuous power but it's not.

What I've done is to use a diode/capacitor to extract and store the power from JTs, by catching and adding up all the short pulses it emits.

Why don't you show me the schematic of the JT you are trying to build, and let me know exactly what you've done, and I'll see if I can help you get it working. Right now I'm using a JT powered by 5 volts to run two neon ring oscillators, just as a display item.

The one below uses a little inductor I ripped out of an old TV chassis, without modification. The nine-turn outer winding that you can see is used as the primary.

ETA: Don't forget the trick of reversing the hookup of _one_ of the coils to try to get it working.

[jhsmith87]

I've used many different plans. I can make one work. I just wanna beef one up any one really. Now u say the primary should be the bigger less turns. The primary goes to where the + battery post and where else.
I have a toroid wound with three wires 18g about 10 turns 23g about 50 turns and 30g about 150 turns.

[TinselKoala]

Well, I don't know about three windings. I'd try using the shorter two in a basic JT circuit and then see if you get higher voltages from the longest winding while it's running on the other two.

You could try this circuit; it's the one from the handheld NE-2 running on a AA battery.

I've just pulled a nice little inductor, 10 mH, from an old TV circuit board, it must have at least 300 turns on a nice ferrite bobbin, and I wound another 30 turns of heavier wire on top of it. Will be testing it out shortly.

I'm no JT expert though. The guys in the other thread are way beyond me as far as getting high power outputs, it seems. But they are using more expensive coil cores than I am willing to buy.

[TinselKoala]

So.... here's that 10 mH inductor from the TV set. I wound about 30 turns of #22 on the outside of it, over a layer of cloth tape, then used the above schematic, with a 330R resistor in the base leg, to make the newest JT. It blew out a white LED immediately, and lights the NE-2 neon/diode load quite well on a battery that's down to 1.0 volts. I haven't yet tried any other variations with it, but it sure works well lighting the NE-2. Batteries that will not light my other NE2 JTs will light this one. With a fresh AAA it is really bright.

[TinselKoala]

OK, I think I just figured out that you want high current draw and lots of output power, not necessarily low voltage operation.

OK....we can do that too. For this application you can cheat a little bit by using a secondary that is already wound for you: a TV flyback transformer. You wind your own primary around the exposed part of the ferrite loop that makes the core of the flyback. Then you drive your new primary with the output of a higher-power self-resonating circuit.

Here's the so-called "ZVS" or zero-voltage-switching flyback driver system that I use. It's also similar to the Royer-oscillator-type wireless power and inductive heater circuits.

With the arrangement I'm using it draws about 7 to 9 amps from a 24-36 volt battery supply, and makes 30,000 volts at the flyback output. SO be careful.

http://www.youtube.com/watch?v=4XRwlNCF1PU