Joule Thief

[Mk1]

@jeanna

Is your jt in attracting mode or repulsing ?

And

Sorry, You can do that. You won't get me to do that again, for sure!

I an not sure what it means ?

If it means its to hard , you just need to connect it one time ?

And i am curious to know the difference in result , if the give different results , then ??

I know you did good so far but you are still new at the scope thing , also not everyone got those ...

So i still don't get it.

Mark

In my experience , taking a 2n3479 and a 2n2222 , and tuning the pot i get better with the 2n2222 same jt setup. even better with 2n3055

[innovation_station]

its the off times ... lol

of the sw...   lol 

hence why 30vdc is needed for fets .... 

ist!

[Pirate88179]

I am posting this here because it is a good site for folks to have.  I use it all the time.  This is a calculator to determine the magnetic deviation and also the magnetic dip angle for your area:

http://www.ngdc.noaa.gov/geomagmodels/IGRFWMM.jsp

This works all over the world and even if you are not ever going to make an earth battery, it is a good site.

Bill

[TheNOP]

If we put a tiny current pulse into the toroid, via the JT circuit, then we will only get a small magnetic field to work with.

If the same toroid was hit with a more intense jolt of current, I would expect a more intense magnetic would circulate inside the toroid.

yes

the way the jt make it oscilations is primarly what prevent a higher current to flow through.
the impedance come second, but it is what make the biggest difference since the oscilation method does not change from one test to an other.

i am waiting for my timer chips to arrive.
i will try to make it work with same 1.2 volts battery to make the oscilation.
i might not be able to do that at 1.2 volts tho, but at 3 volts, it should work.

[altrez]

@Altrez,
Just take the tape measure and go from ankle to knee, (half a leg) 

jim

hahahah that was great!