Joule Lamp

[cyber19]

It would be nice if one of you would try the primary on the INSIDE tube either air or around a couple different types of metal rod.

[b_rads]

@Lynxsteam:
Due to yard work and Mother’s Day, did not get a lot of time to work on this project.  I have all parts and do have L2 wound on ¾” schedule 40 PCV cut to 9” length and wrapped with 8” 30gauge magnet wire.  Found the sleeve, same as you showed, cut to 9”.  I wrapped it with 20gauge bell wire, 42 turns with a tap every 3 turns.  I really like the board setup as it looks to be more conducive to testing.  Will mount mine on a board as well.  I am attempting to be as nearly identical to your setup as possible, to eliminate any chance of failure.  Hopefully, I can finish this evening and get to some testing.
@SkyWatcher123:
Your video is very encouraging.  I first wound my L2 nearly identical to yours.  Mine is 1 3/8” diameter and 11” in length.  Did you wind L1 directly onto L2 or use some sort of sleeve so you could move L1 up and down to find your sweet spot?  How tightly did you wind L1?
@cyber19:
Those are some nice suggestions to try.
@conradelektro:
Did you get CoilZilla to fire?

[Lynxsteam]

I think the only way to get the same performance as the E-Core ferrite transformer is to get bigger.  There is only so much energy we can store in a 8.5" long 30 awg wire coil, whereas the ferrite core can store up and give back a lot of energy.
By the way, I tried placing the 26 turn primary at the middle and it works very well.

Looking back I was just intrigued with the one transistor circuit and wondered if it could work with an air core.

I hope some of you explore this area and see if there is anymore optimization.  My coil seems to max out at 6 watts output.  That's Ok for one light, but to be competitive with the Super Joule Ringer 2.0, we need to get to the point where we can light more LEDs or the same more efficiently.  The "bar" is set high.

Today I will wind a secondary much larger with 20 awg and use 10 gauge insulated for the primary and see what I can get.  I will also use a 10:1 ratio to compare output to the E-Core 10:1 transformer.  Fun, fun, fun!

[SkyWatcher123]

Hi folks, Hi brads, I wound the plastic coated speaker wire directly over secondary coil and just used the ends and tied them together to give the coil a little tension and it is movable up or down to find sweet spot.
Hi lynxsteam, those tests sound like a good idea, though I was having trouble just getting 24 awg to oscillate on the secondary, maybe you will have better luck.
I still have no conclusive amperage measurements yet.
peace love light
tyson

[Lynxsteam]

Success!  This design is scaleable.   
Below are pictures of the components for a 13" version.  The secondary is 20 awg essex magnet wire wrapped on a 1-1/2" PVC pipe 13" long.  There are 336 turns.  The primary is 12 awg home type stranded electrical wire wrapped on a 2" Pvc pipe 13" long, 33 turns spaced evenly across.  The circuit is the same reversed biased 2N3055 and the battery is 12 volt.

The lights came right on.  No discernible drop in brightness 1-4 bulbs.  Amp draw for four bulbs was 1.6 A.  That's 19.68 watts to light four 7.5 watt LED bulbs.  19.68/30=65.6% of the power.  The brightness was actually better than the small SJR2.0, but this circuit was designed to reach 25 watts and I don't think my small E-Core transformer is designed for that.  Which design is better?  Hmmm....  The limit for both of these designs is the reversed biased transistor.

I am no electrical engineer, so I hope maybe someone can make some improvements.  It is simple though.  Any thoughts on the amp limit on the reversed biased 2N3055?  No need to make this bigger than what the transistor can handle.