Joule Thief

[timmy1729]

@MK1 & Bill

Ok, you totally lost me here.
1. Do I keep the current winding I have on the toroid and add the smaller gauge wire on top of that?
2. Or do I strip the toroid or wire and totally re-wind it up with twice as many turns of smaller gauge wire instead?

A visual of the windings and circuit would REALLY help me out here.

[innovation_station]

nicely wound ring

electricme!!

great job ...

ist!

cant wate to see what you do next!!

[rensseak]

@ Norbert

Well Well Well, what have we here, take a look every one, here is the 1st time this forum has seen a working example of an "airless" jule thief bifilar wound coil. I am impressed, and the photo is good also.

IST mentioned in a couple of his posts that this could be possible, the last pic shows many white LEDs working.

Norbert, this is impressive, congradulations.

You mentioned you have replaced the resistor with a adjustable resistor, again well done, I had thought of this myself but didnt have one so didnt worry about it, you beat me to it. Having a variable resistor here will give you a bit of "control" over what the JT can do, I suppose it could be see as a fine tuning of the JT.

I suggest you to try it also with a adjustable resistor. Not only that the frequency will change also the power consumption. Change of voltage at the base of the transistor will change also the frequency.

OK, lets get down to the reason you posted.

your voltage goes up and down when you alter settings,.
This is to be expected, as you change something ever so slightly, it will change something else, if the light flickers quickly, this may mean a crook connection. First clean your contacts on the breadboard, then the wires that poke in the small holes, see if that fixes the problems.

Yes, the last observation of me with the climbing and falling voltage is just because of to many alligator clips. The contacts are bad or lost easily.

The JT is running on the energy inside the rod (magnetic field), when you pull the rod out it is seeking the energy from somewhere, so I think it begins to feed off it's own energy it creates when the rod was inside the coils. So it seems to me the magnetic field produced by the bifilar coils can be utilised without the rod being there, as the field is in existance, energy can be drawn from it as long as it exists, hmmm 
Has anyone else got some advice for Norbert?

Just to say it clearly without the rod the LEDs lights only when the resistance to the base of the transistor is almost 0 Ohm (or direct from the coil to the base).

Norbert

[Mk1]

@All and timmy

I have to be honest it seems like not many people get the pickup coil bit.Ok lets start fresh , first keep your jt that are working as is .;
Second Just add more wire to it. And this is really important rectify the output otherwise your multimeter wont read if.And will think i am pulling your leg.

Again don't destroy a working unit to test this . The joule thief is center taped transformer (and has 2 coils), And by adding a third coil around it you will get more I like to call if the pickup coil because its only there to pick up more voltage from the core.

If you still don't get it Read all my post .

@electricme

A jt has 2 coil a dual jt has 4 coil , and mine 6 coil , 4 of 12 turns and 2 of 48 turns the last two a call pickup coil.

And if you still don't get this then just do it.

I need you at the same level as me.

And by the way lighting led in parallel shows that you have 3 volt in parallel , it you put 4 in series you need 4 time
3 volt for it to light so 12 volt , that is the reason i use led in series to show my experiment .Anyone can ad as many led in parallel it dosen't really mean much.

Also look at my dual jt you see colors under the copper coil those colors are the jt coil.copper is the pick up coil.

The blue and green coil are on jt 1 and the red and yellow is on jt 2. Plus 2 copper coil Of 48 turns each on top , those are the one giving the output, and are only connected to diode bridge.

[xee2]

@ Mk1

Adding another winding will give you something similar to the Fuji transformer (except in the Fuji transformer the extra winding is 1750 turns). A rectifying bridge is not needed to read the voltage from this winding if the meter is set to read AC volts (in that case the voltage is rectified in the meter).