Joule Thief

[innovation_station]

well i frired up my little green GEM LOL

it works well from 1.5 v   squeels up a storm .. im getting 11vac x2 mk2 feedbacks ....  im powering the led on the transistor as normal

and my secondary reads 170vac ....    all with out any diodes .....  just the 1 super blue wich is extreamly bright that is on the jt unit out put ..

verry verry freq  sencitive  ....   also when you remove the led on the jt the freq drops ... so does the output ....  might try a few diffrent leds to see how the FREQS CHANGE THE OPERATION OF THE RING 

ist

[Pirate88179]

@ IST:

That is interesting, to say the least.  One thing, since you have the led on the transistor, it is still a diode remember, and it is influencing your circuit probably the same as if you put a regular diode of the same value in its place.  What do you think?I am making a sort of semi-educated guess here, I don't pretend to know any of this for sure.

Bill

[xee2]

@ slayer007

Mabe the recitier is picking up the voltage both way. Any ideas

Standard voltmeters do not read correctly for anything other than DC and perfect sine waves. For non-sinewave AC or pulsed voltages it is best to use a scope. But the following circuits can be used if no scope is available to read the peak voltages. You might want to check the peak positive and negative voltages you are getting. Note that the only difference between the positive peak detector and the negative peak detector is that the diode is reversed. So the same circuit can be used, just reverse the diode.

EDIT: a full wave rectifier usually produces 1/2 the peak to peak voltage.

[Mk1]

@electricme

Tuning , first tuning the jt coil for the core. First i will tell you why a made a mk1 style instead of a slayer type , witch i tested back in December. I made one exactly like slayer but made some test, what i did is make a pickup coil 3 turn and rectified it then a moved it at different spot and saw close to the jt coil all was working fine but when the coil is a the middle point the voltage drops really badly, that is why i built mine with 2 coil at 180 , that resolved that issue .

Now tuning a jt coil , first make pickup coil then rectify it , also replace the resistor with a trimpot or pot, then try one turn jt coil
play with the pot get the voltage has high as you can. then ad one turn re tune the pot , do this until your pickup coil start getting a lower voltage ( remember to tune the resistor every time) , so finding the spot where the pickup coil starts losing power , and stay with the one the give you more output on the pickup side. This will make sure that the core is tuned. Why because the ration between the jt coil and the pickup coil will effect the output voltage , so if your jt has to many turns the pickup coil is giving a lower voltage.

After that , remove the pickup coil and replace that one with any numbers of coil , re tune the base resistor , there is a spot where it get higher its a exact spot , when tuning it the voltage goes up , all the way to that point then drops down real fast
so try to find the highs spot . Then you will have a tune jt coil and toroid, the coil makes sure the toroid has just the right amount of inductance and the circuit is switching at the best freq for the toroid.


To many jt turns lowers the output of the pickup coil by changing the ratio.

The resistor is to make sure that the jt coil switch at the best freq for the core.

When changing the battery voltage , the resistor (trimpot ) need adjustment to keep it in operating range .

Mark

I hope this helps

Also , many layer , the first 2 are the best after that they go down a bit.
This is not a issue if you want to run a cfl , since it doesn't need much amp , just high voltage.

This is the reason for my different design and using a bigger wire and less layer.

When the jt has a led in its regular place , it changes the freq so , most of the time i get 1/3  of the secondary voltage.

[RAF]

Just a hello to all.  Finally caught up on the reading in this tread   WOW!!!!!

I was intrigued to this tread when i saw Lidmotor’s post on the JT  Resonance Effects For
Everyone To Share . Then saw Pirate’s lighting  400 led’s

Jumped out of my chair, ran to the one and only Fugi camera in the house and tore it apart.
After trying to decipher the circuit found Jose Pino's site and proceeded to de-solder parts off the
board. Anyway hooked up a modified CFL pushed in the battery!!!!  arms, Fugi board and CFL
went flying through the air. After modifying another CFL and carefully putting the battery in I
had some great light.

I normally do not join the treads and reply, and do not have anything to contribute as yet.
But as you all know there are a lot of us out here following, doing and learning as we go.
So a hardy  THANK YOU ALL and who knows maybe I’ll come up with an idea to share with
you.

I truly believe that man’s salvation is when we learn to understand one and other and share that
knowledge .  However as bad as it is!  “and this scares me” it will probably get worse before
most learn to understand.