Joule Thief

[stprue]

@Jeanna

Do you use a cap off the rectifier.  If you don't you should try it on one of toroids.  It should jump the voltage up on your biggo about 3-4 hundred volts.

[stprue]

Jeanna:

Thank you.  I remember reading in one of my Tesla books that once, Mark Twain (Samuel Clemons) went to Tesla's lab, which he did often, and it was very late at night.  Twain described what he saw in great detail.  He said Tesla went into the dark lab and switched on a small device and suddenly, the entire lab was lit up as bright as day.  He described evacuated tubes positioned all over the lab that were lit up very brightly giving the illusion of daylight.  To me, this sounds a lot like floro tubes being driven by high voltage and yes, high freq.  He went on to say that no wires were attached to these tubes and Tesla even picked up a tube, and walked about the lab with it and it remained very bright no matter where he walked.

This is why I believe that our higher and higher volts matter on the JT experiments.  I really believe we will be able to do even more amazing things at higher volts and higher freqs.

Bill

If this is the case why don't we just hook up our JT's to voltage multipliers?  Does the freq. go down if you do this?

[jeanna]

@Jeanna

Do you use a cap off the rectifier.  If you don't you should try it on one of toroids.  It should jump the voltage up on your biggo about 3-4 hundred volts.

Well, no, I don't use a rectifier.
I did get a good result when I added 2 caps in the BJT:
the battery cap of 25 uF (I goofed there I was trying to make it 100 but I did it wrong)
and
a cap at the base resistor.
Well, that is when the fluoro tube light went on the day it wouldn't go on.

I am trying to do this while keeping the secondary ac as ac. Rectifying it and storing it in a cap will stop the oscillations at this point, and I want to keep them going.

Hopefully I can do some of this with toroids I already have handy.

thank you,

jeanna
edit
You asked Bill this:

If this is the case why don't we just hook up our JT's to voltage multipliers?  Does the freq. go down if you do this?

In my experience, the frequency goes down when you raise the volts and goes up when you lower the volts.
Only a very few times have I seen this not be the case, and in all of those times, the wave was very wiggly and I do not think the scope could see it right, or I chose the wrong place for the markers to measure the frequency.

[stprue]

@all

This could belong here as well.  It is from the MPI Patent topic and is very interesting.

http://magneticpowerinc.com/patent.html

[stprue]

Well, no, I don't use a rectifier.
I did get a good result when I added 2 caps in the BJT:
the battery cap of 25 uF (I goofed there I was trying to make it 100 but I did it wrong)
and
a cap at the base resistor.
Well, that is when the fluoro tube light went on the day it wouldn't go on.

I have never got good results from a cap at the base resistor.  I must not be placing it right.  Do you have any pic's of this so I can see my mistake?  Does it have to be a 104 because it seems like that is what everyone is using.  I think I can get my voltage up if I can place this cap right!