Pulsed DC Transformer with Embedded Magnets

[ltseung888]

Lawrence:

Good to see you again.  With that sized toroid you can easily get over 2,000 volts, with the AA battery input.  I have done this, Jeanna did it first and then Lidmotor.  It is a matter of tuning your circuit to the toroid to hit resonance.  Check out our Joule Thief topic to see detailed information on how to do this, or PM me and I will try to explain it if you need me to.

I have be fascinated by this circuit for years now.  It is so simple and basic yet just look at what folks have been able to do with it.  I thought I was in the lead lighting 400 leds from a single AA bat. and lighting a 48" long tube but now many folks have surpassed me.

I really believe we are just in the beginning stages of understanding this circuit.

Tell Forever I said hello.

Bill

Thank you for your advice and your PM.   Your PM contains extremely important information for all toroid researchers.  I should have read it first.  I am reproducing it here.

This will work on the simple basic JT bifilar wound circuit. Replace your resistor with a 5k or 10k variable resistor. Slowly turn the vr and watch your led. When your led reaches maximum brightness, stop. Measure the resistance on your vr and then you can replace it with a resistor of that value. Or, you can leave the vr in place if you want. Note that if you go past the brightest point, it will begin to dim.

My multimeter suddenly stopped working when I was changing capacitors.  I hope that it was just a blown fuse internally or something simple.  There were many warnings that instruments could be damaged at resonance.  Your technique may be a cheap way out.  I shall be “out of action” while the meter is being repaired.

If I did hit “resonance” and got surges of voltage and current from the lead-out energy as predicted by the Lead-out Theory, a damaged multimeter would be a small price to pay.  It will be a matter of mastering such “runaway” energy.  If we are sure that energy can be led-out or drawn-in at such an environment, we can design circuits to control it.  The problem should be much simpler than runaway nuclear reactions.

[ltseung888]

Another two air-core Toroids

I built two more air-core toroids.  One is the standard winding as recommended in the simple Joule Thief.  The other was wound with one complete layer in the inside.  Then a continuous three section outer layer was wound on top.

Both toroids worked in the standard Joule Thief Circuit.  Without the waveform multimeter, I could not do much. 

The charging of non-rechargeable batteries was only good up to a point.  I swapped the batteries a few times.  Both ran down.  There were flashing periods of the LED.  The LED was still on with less brightness.

I now have rechargeable batteries.  I put them on and see what happens.  The best scenario is that they could recharge each other forever with lead-out A.  The next experiment is likely to be adding capacitors to the Joule Thief Charger.  The focus will be using air-core coils.


*** I focus on air-core because I would like to minimize damping effects.  Magnetic permeability material will have lingering magnetism and that can be considered as damping.  Hunting for resonance means avoiding damping. ***

[ltseung888]

Just added a capacitor to make circuit closer to LCR circult.

Joule Thief continued to work. LED remained on.

[e2matrix]

Another two air-core Toroids

*** I focus on air-core because I would like to minimize damping effects.  Magnetic permeability material will have lingering magnetism and that can be considered as damping.  Hunting for resonance means avoiding damping. ***

That is very interesting and something that I have wondered about using air core for a JT.  It seems one line of thinking says that iron or ferrite will magnify power but the other line of thinking is that air core will avoid damping and increase resonance.  It seems it would be worth trying air core.  Good luck with it.

[ltseung888]

Flashing Joule Thief

After adding a 680 microfarad capacitor to my air core joule thief, it turned to a flashing joule thief.  I checked for loose connections.  Everything appeared to be firm.

The flashing speed is low and observable â€" about 100 flashes per minute.  I can use this feature on my Christmas tree this year.

The more interesting question is â€" what is happening here?  Some type of “pulsing” must be happening?  Pulsing is likely to lead-out electromagnetic energy.  Are we having some sort of resonance?  I missed my multimeter.  May need to borrow an oscilloscope again.