Joule Thief

[Mk1]

@all

Jeanna Yucca check this tread

http://www.overunity.com/index.php?topic=7978.msg198505#new

[resonanceman]

@resonanceman

I have gone up to 9 volts so far. I got up to 3,000 volts with the AA and 16,000 with a 9 volt transistor radio battery. But, I think with what you have it may not be safe to use more than the AA. I am just using clip leads, but all of the wires are spaced far apart.

Xee

I agree

With a AA  battery  I can get  more voltage than I care to try to measure .

My  experments  driving  a  JT  with higher  voltage   are about   getting more power  out ........  High  voltage or big sparks  do not interest me  unless  they  are part of a  process of  making real  power .

gary

[jeanna]

Gary,
ARE you getting more power out when you start with more volts?
In my jt experiments, if I try a 3v battery instead of a 1.2v which is a rare curiosity experiment, I do not get higher voltage out. I get higher frequency, but even that is not much higher.

It seems to me there are 2 special things going on.

1- the basic joule thief toroid with the transistor cutting on and off, then

2- the secondary which derives its output from the toroid and other than that,  has little if anything to do with the energy going into the basic jt.
Its power is derived from the inductance it has because of the number of its windings and the oscillations being caused by the EMF of the toroid.

They are together on the same toroid, but are only joined by the magnetic fluctuations. So, a higher input won't make a much higher output unless it changes the rate of oscillations. And, although I have  seen it do that with increased frequency, I have not seen much increase in output..
The number of turns and turns ratio to the primary Collector turns is what will increase the secondary in my experience.

Are you also seeing this?

jeanna

[Yucca]

@all

Jeanna Yucca check this tread

http://www.overunity.com/index.php?topic=7978.msg198505#new

I watched those vids a few days before that thread started. I´ve seen this behaviour before in HF and VHF loop antennas. The radio name for devices like those is a "lecher line". Fascinating things.

[xee2]

@ jeanna & resonanceman

I am getting better performance with the flyback than I was getting with the toroid. There is no way I could light a fluorescent tube from an AAA battery using only 10 mA with any of my toroids. At 10 mA an AA battery should be able to light the tube for over a week.

EDIT: Ferrite is lossy. The flyback uses an iron core and thus has less loss in core.