Joule Thief

[Artic_Knight]

@Artic

        If a transformer core is already saturated and we hit the core with another pulse what does this do to the core magnetic circuit?  The second pulse would be producing some kind of magnetic response in the field inside it's turns but wouldn't the impedance normally associated with core saturation be negligible.  In other words would there be an instantaneous flow of current in phase with the applied voltage even though it is flowing in a conductor geometry that would normally not allow this to happen.    I'm talking about a torroidal transformer driven to saturation by a first pulse followed in very short order by a second pulse.

sparks im not sure if i understand you completely or not so please correct me if im wrong, my understanding is that you have a saturated core with a magnetic field say rotating clockwise, you add an additional pulse clockwise with the flow and want to know if that will create a current?

understand this, the magnetism can only induce a voltage or current into a wire IF its changing increasing or decreasing. now if you have that core saturated and blast it again essentially adding to it at that moment your only going to get an output equal to the input, after which as the saturation slowly falls (depending on how its rigged i had one keep a led lit dimly for about a minute after power removed) as the saturation naturally falls it will generate a small and slow output. with the coils soo close as they are in most torrids even with the core saturated there is still the "air core effect" where magetism can still be put it however it will be extreamly short lived as there is no room for it to continue circulating in the core. at that point above saturation you have to consider its effects the same as a air core.

does this answer your question?

[Artic_Knight]

@Artic_Knight
yep already built this one 2 weeks ago . i discovered putting a cap thru the base with a couple resistors  . "electrolytic "that it blinks thus conserving the 1.5 volts for days longer however i did notice when she finally reached a lower voltage on the battery the blinking gets slower  and stops and the led remains lit  acting like a normal JT letting me know that i have a day or so before it dies completely .. . this is one of the ones i gave my little girl . it is covered with clear goop to keep it intact .Edit forgot to mention that i put this little green thing on it across the electrolytic . It was in a computer power supply glued on top of a capacitor so i think  it is a thermistor . Its not Exactly the same using two legs of the transistor but Blink can be made from the 1 volt battery instead of 9 v and i suspect a tuning cap there across the same spot  will accomplish a blink also .I thought is was interesting that they can make that transistor run with two legs though . COOL.

yea in a seperate thread i created i looked for timing circuits and they responded with something more complex than i wanted, ie 555 timers and a something wierd ocilator? using 2 transistors, needless to say i figured there was a way to create a timing curcuit with less parts but i just could not bring it to mind.  now i know i can use something like a diode (a 2 legged transistor) to accomplish this feat. basically the principle is the same as the joule thief once the voltage is high enough it will "force" its way through the block. now all you have to do is find a suitable block which can come in many forms and packages! a wiki search for diodes should turn up answers on diode behaviors and show a suitable diode for this use.  keep in mind even a normal diode has a "saturation" point that must be achieved before current is able to flow even for normal operations!  if my memory serves me you can get different diodes with higher (take your pick) saturation levels. 

[Artic_Knight]

IF YOU WANT TO LEARN SOMETHING  KOOL AND HOW IT ALL WORKS ....WATCH THIS VIDEO   


http://ca.youtube.com/watch?v=QRyKVU6YzYw&NR=1


IST!

in reference to that video i  think youll find that the huge spike is negative reversed from the magnets approching the coil which would be positive (or vise versa depending on your positive negative orientation) that spike comes from the magnet leaving the "peak" or dead center of the coil cutting the second half of the coil. basically its one half of a AC generator. back emf counter emf its just the "reversing of currents" associated with a magnet passing a coil. use an ociliscope if you got one to test!

[innovation_station]

my friend i have many things and many ways to achive the same 

i currently have close to 150 inventions of my own ... 

i can do this compleatly from lol a few things..... NO TUBES ....  OR SS .... 

yea well ...

ist!

im shareing some things now ....

[jeanna]

@AbbaRue,
I went back for this quote of myself and saw your post about the laser beam. wow. thanks. Very cool.

Yes,

I am in the process. I took advantage of about 4 hours of winter sun on one set of batteries. Now, I will see what 4 hours of the 30 led  array will charge on another set of discharged batteries. This will be a very approximate indication of what the array can do in a solar charger.

jeanna

So, after 4 hours of being charged by the 30 led array, the batteries did not budge. They remain 0.5V

The others in 4 hours of winter sun are now in use in a commercial battery run candle. These usually last about a week when they are on for 12 hours per night.

So, winter sun beats the 30 led array.

Since I still only have 30 leds, I will make a series of 2 that are 15 deep and measure the amperage draw.

Oh, but I forgot, I still want to get as many winds on one of these jt's as I can and see what it draws with the array.

Thank you,

jeanna