Joule Thief

[hazens1]

@IST
Just expirementing around to get some things straight in my brain. I threw these 4 coils together just to see the difference that each has on identical or nearly identical circuits.

@Jeanna
Thanks!

@All
Here are some of my recent working cores. Some with Secondary(Pickup) coils, some with just Base and Collector coils. All of these with the right resistor/capacitor were able to light LEDs from the classic JT Collector/Emitter location and/or Secondary coils if it had one.

1.  38 turn bifilar 26ga (Base/Collector) on a 1.25 inch power supply toroid (NO Secondary)
2.  22 turn bifilar 30ga (Base/Collector) on a 0.25 inch CFL toroid (18 turn 26ga Secondary)
3.  22 turn bifilar 26ga (Base/Collector) on a 0.50 inch power supply toroid (88 turn 30ga Secondary)
4.  ~80 turn bifilar 26ga (Base/Collector) on a 10 turn 22ga copper 2 inch toroid (10 turn 22ga used as core works as a Secondary)
5.  10 turn 26ga Base, 10 turn 26ga Collector on a High Permiability 1 inch Elec-Goldmine toroid (80 turn 26ga Secondary)
6.  22 turn bifilar 26ga (Base/Collector) on a 5/8 inch power supply toroid (44 turn 26ga Secondary)
7.  ? turn ?ga (Base/Collector) on a Transformer core from power supply (NO Secondary)
8.  ? turn bifilar 22ga (Base/Collector) Speaker wire air core on spool (NO Secondary)

TYGER

.

[jeanna]

@MK1,
Did you ever try to make secondaries that have different lengths all on the same piece of ferrite?

I am thinking of kicks, now. I am just wondering if you tried it. It will not be an easy thing to wind .

Here is my idea.

To start with there will be 2 lengths, but ultimately there will be 3 .

put all the jt stuff at one end.
take 1 wire 90 inches and fold it in half and mark its center.
Do this with another that is 60 inchec long and mark its center
Do something to be able to distinguish the ends.

twist all 4 wires together up to the center mark of the shorter one.

wrap this around a toroid to the first center mark just described.

Take the remainder of that shorter wire and hold it aside and continue wrapping up to the middle mark of the longer one.
Turn and wrap down to the point where the shorter one has been held aside.
Add this shorter one and continue to wrap all 4 wires to the place where it all began.

This should give 2 kicks per cycle, should it not?

Maybe it will cancel.

It is worth trying, but if you have already found that it cancels, maybe not.

thank you,

jeanna

[jadaro2600]

@hazens1, how well does #5 perform?

@ist, Have you ever though about using a Villard / Greinacher circuit for ramping up voltages?

@all,
Villard / Greinacher circuits here:http://www.kronjaeger.com/hv/hv/src/mul/

[jeanna]

@Altrez,
I am thinking what is wrong might be how or where you are hooking up your secondary wires.

Did you already answer this?

Exactly what are you doing with the burned/sanded secondary wire ends?
You have made a pic of your basic jt or toroid. If it is too hard to describe, can you upload a pic of the secondary wires in place and not working?

This is such a puzzle. I am sure the answer is very simple. Once solved, it will probably help lots or others too.

thank you,

jeanna

[Mk1]

@jeanna

I did make coil of different type on a single toroid , i am not a fan of the separated coil on one side , because of the dead spot it creates .
On your 20 per coil you may get a bit better results , but not that much , its the toroid .

@Hazen1

I don't think you should be twisting the ends of the coil together. and the end of the pickup coil don't leave them on the other coil.

Btw i don't see why your toroid should not work.

Mark