Joule Thief

[guruji]

@all

Merry christmass and happy new year!

I found the key to close the loop on the joule thief circuit.
You know that the coil has a part that is called feedback.
I added to it a diode and the circuit was coded into the circuit simulator.

It shows that is self running.
The screen capture is included.
If anybody has a circuit simulator and want the code to test if this is true I will post it here for all to use it.

You know, maybe I die and the circuit is thrown away because is not understood.

Jesus

Jesus can you please give us a little explanation about that winding of the selfrunning that you've posted please?
What's that wire coming up from the middle of the JT? It's just a junction to the coil?
Happy Christmas to you and your Family.
Thanks

[xee2]

Pirate88179 and slayer007 and anyone else interested,

This is my theory of what happens when magnets are added to toroid. The magnet lowers the permeability of the core. This reduces the inductance of the coils. This increases es the frequency of the oscillator. This causes more pulses to go to tube per second thus increasing brightness. BUT, reducing inductance of coils also reduces the output voltage. Therefore there is no more energy being delivered to the tube, just more pulses at a lower voltage. I have a very  strong 1/2" neo and when I put it on my 3.38" core it lowers the voltage so much that the tube will no longer light. I hope that helps explain what is going on. It is probably a lot more complicated but I think that is basically what is happening.

[Artic_Knight]

Slayer007:

Last night I was fooling around with my Jeanna Light replication and decided, I have no idea why, to stick a strong neo on my toroid.  As I approached the toroid, I could see the light getting a bit brighter and the buzzing went up in pitch.  So then I added a second neo part way around from where I put the first one and the light got even brighter.  I had to adjust my base resistance a little bit but this works well.  I have no idea why this would be?  So, it raises the frequency and somehow changes the permeability of the toroid or the induction properties I suppose?  This is cool to know though.

Good video of the effect.

Bill

i believe what you are doing is saturating the core without the use of electrical magnetic field. there was some documents of a dual torroid "transistor" used in rockets i believe and by the navy, as a matter of fact i think it was the navy that posted the documentation about it. this dual torroid would saturate with DC current. this allowed the effeciency to supposedly reach 100% who knows maybe more.

my curiosity is, can you turn the joule thief off and on while the magnet is attatched and this effect continue? or will it not start? i currently do not have a magnet myself to test with so if you do this test please let me know!

[Artic_Knight]

Pirate88179 and slayer007 and anyone else interested,

This is my theory of what happens when magnets are added to toroid. The magnet lowers the permeability of the core. This reduces the inductance of the coils. This increases es the frequency of the oscillator. This causes more pulses to go to tube per second thus increasing brightness. BUT, reducing inductance of coils also reduces the output voltage. Therefore there is no more energy being delivered to the tube, just more pulses at a lower voltage. I have a very  strong 1/2" neo and when I put it on my 3.38" core it lowers the voltage so much that the tube will no longer light. I hope that helps explain what is going on. It is probably a lot more complicated but I think that is basically what is happening.

thats interesting and honestly not surprising that it lowers the voltage. i would imagin its very hard for a magnetic field to collaps in the presense of a magnetic field which is the exact principle that allows the joule thief to be so effective.

hm but it increases oscilations? i cant help but wonder if it increases the output? perhaps a calculation of before and after in wattage would show a difference of some sort.  the MEG or Motionless Electromagnetic Generator seems to use a more complex and controlled version of this very principle.

[Artic_Knight]

i wonder how a magnet would affect the JT if it was the core?  it would be presaturated, perhaps the oscilations of the JT would create a desturbance strong enough to generate a surplus. 

if using a magnet saturates a nonmagnetic core and prevents magnetic collapses and if the navy is accurate in its judgements then using a ceramic or ferrite bar magnet as a core would yield a 100% effecient transformer.  there are some really weak and flexible ferrite magnets commonly used as bumper stickers and on refridgerators, perhaps they would allow a shift in the field.