Coops - JT

[sisqocracker]

I know this appears to be just another JT circuit. And for the most part it is. What I like to do, is to try and find "off the shelf" products that can be re-purposed into JT circuits. And to scale them up, where I can. I've finally found, what I think, to be a good combination of common parts that folks can replicate this circuit with. Without maybe having all of the test equipment a lot of us have the benefit of using to tune these circuits.

What I have here are a transformer I picked up from EPO (Electronic Parts Outlet) in Houston. It has a label of TAMURA microtran PL10-24-130B, 2x115v~ 50-60Hz T40/A, 2x12.0V, 2x5.0VA PL
It has posts numbered 1, 3, 4, & 6 on one side and 7, 9, 10 & 12 on the other. the side with the numbers 7-12 are larger gauge wire than the 1-6 side. So of course this smallest gauge wire on the transformer is meant for the 115v AC side, and then the larger gauge wire is meant for the 12v and 5v outputs.

Next I have a common 3055 transistor that we're all familiar with on these forums. Nothing special there. Same goes for the rest of the parts list; I have one 200v 330uf capacitor, a fixed 2.2k 1/4 watt resistor that feeds into a 1k pot (1/2 watt or less), 13w CFL with the circuit removed and just using the wires leading out of the CFL itself.

Optionally you can run a diode (I used an N4006) to take the collapsing field from the collector of the 3055 and run another load through that, and into ground.

There are pics attached plus a video on YouTube under sisqocracker.

Thanks,
Coop

Here's the URL to the video on YouTube:
YouTube - Coops-JT Part1

[sisqocracker]

Oh, another note, you can substitute the CFL for a flash out of a Polaroid Sun 660 land camera. It makes awesome lightning sparks inside the tube.

Thanks,
Coop

[Farmhand]

Good work ! reusing stuff is a very good way to go, I love to reuse electronic componants they are so plentifull, there is a real art to using what you can get or finding a way to use what we have got.

Transformers are a bit of a mystery to me the one's I find have all sorts of connections, they confuse me. Some of the older stuff may have some mildly toxic materials so we should be a bit mindfull of that maybe but nothings perfect Some older stuff is very rugged.

I havn't built myself a JT yet but I will soon they certainly look to be one of the mainstays of the efficiency seeker.

Cheers

[sisqocracker]

It's interesting, there are a couple of long threads about two different ideas whom are both combined into this one circuit, but that seems to have gone unnoticed here.

I am currently working on the switched 555 version of this same circuit and will post any updates I have of that.

Also as an FYI, I did follow the Imhotep relay to car coil circuit (albeit 2 years later than most everyone else) and found a lot of the same results most others found. I'll post over on that thread with what I have there.

Thanks,
Coop

[sucahyo]

Sometimes removing the core can make the CFL brighter, usually when the resonance happen on frequency higher than iron core can handle.

[sisqocracker]

makes sense

If I were to drive the frequency high enough, then I could probably be ok with an air core. But would think that I'd lose quite a bit of voltage gain compared to letting it go slower and allowing time to be on my side.

Thanks,
Coop

[sparkfishes]

Thanks for the You tube posting and the pics however, I have not been able to find the diagram. here or Youtube.You said you had changed the normal circuit slightly. Did you connect the tXfromer winding in antiphase as a normal J.T?.
MayI see a circuit please ?