Joule Thief

[electricme]

@Resonanceman,
I will explain it to make it easier.

Jim 

that looks like  a good idea .,,,,, but kind of hard to make

I   just  stuck the  wires though holes in the side of the spool and  used hot  glue to add a little extre wire to make them stronger .
I  use alligator  clips  for the connections .

I  am wondering if something like that could be used for turning  a coil ?

gary

I understand you, you are referring to just winding more wire onto a stright coil former you buy from the wire supplier, but only if there is enough area left on the spool former to do this.

To tune a coil, hmm.
Now here is another idea, these are coming to me thick and fast at the moment.
This modification will allow you all to "tune" the amount of magnetic influence or density of the flux inside the toroids.


Hi Gary, and all,
If you decide to give this a try, it wont hurt and it will still be a JT output anyway.

Say you want to make a JT with a 200 turn output coil.
Begin by winding on the coil in the usual manner.
Then when you get to 20 turns, just pull the wire out a bit more (about 6") then twist this "loop" where it comes out of the toroid, then go and wind some more turns, make them 20 turns.
Then pull the wire out 6" again, twist, and continue another 10 turns.

Do all this over and over until you have as many outputs as you want from your secondary.

Experimenting with different turns to loops "ratio" will allow you to get the right number of turns between loops.

I always use the thinnest wire I can find, as I can get more turns on the toroid.

This is the same as winding a single coil, but you just take the 30seconds or so to make a loop in the coil.

Tuck the "loops" out of the way when winding.

[electricme]

@ Jeanna,

Nice Jim,

This could go somewhere as a beginning generator for big ac power. (well, big in a small sense.)

jeanna

Thankyou Jeanna.

Jim

[jeanna]

@Jeanna
Real well !

OH I AM JUMPING UP AND DOWN!!!
This is sooo exciting.

the loading effect is greatly reduced

What does this mean? What is the loading effect?

Floyd Sweet and Lester Hendershot also used it

No wonder. wow... this is sooo cool.

I made so many of those things last year. It is too bad I didn't make any 2 alike!... but then, why would I?

thank you so much,

jeanna

[jeanna]

Gadget

Thank you gadget,
That is a very thorough answer. And you did all this on an EB?

I just am asking if it worked on the EB. I can get all kinds of things to work on really dead batteries, but not on my EB. I believe it can be done, I just have not been able to actually do it.

jeanna

[electricme]

@all,
WOW, this thread is galloping along this afternoon, (well for me anyway) at this time of the day here I generally have the entire thread to myself, nice to see everyone.

(nice to see all the phantom readers (about 23 at times) along for the ride also ha ha you are more than welcome)

OK all here is a little mod to the top of the Joule Thief I came up with, it involves putting 2 extra pots into where the (+) power enters the JT at the toroid . ends

We generally use 1 resistor at the base of the transistor, it wouldn't matter if this was moved higher up in the circuit as shown.
Then place a second  resistor 1k value between the (+) feed into the other side of the JT toroid.

Start the JT with both wipers FULL ON, clockwise, then back eithor off to have further control of the JT.

Perhaps a "tank" circuit could be setup here also, but I havent got to that yet, it just came to me as I was typing this up right now.


@ Gadget, MK1, Gary and Jeanna
Those are good ideas and that double toroid looks wild n cool to me.
I had betta make a note of the last 2 pages and go and read up on them later on.

By the time I get another page ready to post there is another one or three below it ROFL


jim