Joule Thief

[jeanna]

@xee,
That is the coil and close to the circuit (the caps sizes may differ) I was using yesterday and today.

I did not get a low amps draw at all. It was much higher than most of my other toroids. My base resistor at 10k barely lights a light.
At 2k the draw was ~30mA on the jt.

And that one is the one that blew my leds..

@all,
I made a led tester and it turns out only 3 are gone completely. 3 still work in a normal circuit, but are kaput for the jt circuits.
This is yet another indication that this jt is pushing the box out so to speak. It means to me the leds can operate as 20 amp users or as very low amp users but high frequency not too high voltage users.

Also:
As promised, yesterday I re-wound my 7-7-70 med toroid to be wound just like hazens. The results dropped to 15 and 4 volts on the 2 sides of the secondary. I first got very grumpy but then rewound it and again I have 85v on one side and 18-22v on the other. I am trying to even these out, but I may need to try a different approach.

@Hazens,
Yes, putting the primary winds on opposite sides is very good way to go. It is what characterizes the MK designs.
He found a dead spot opposite the wire ends of the primary. He calls it 180. So, he split the primary into halves. This gives the opportunity to then have pickups wound on either side of the primary halves. These can be added in parallel for more amps-'grunt'. I have not been able to connect them in series yet, but he and IST both do.

All of these pickup coils give out as much as one does with no additional draw from the battery, and their power does not diminish by adding more still. If you have a coil and ferrite material where the secondary/pickup gives 30 volts, each and every pickup coil added to that same toroid will also give 30volts. So, that is the reason I got 120volts potential off my MK2. I never got more than 30v, but 4 of them add up to 120v when MK1 and IST put them in series. (I must be doing something wrong)

@Bob Smith,
Sounds like a reason for you to start winding. Each of us has a personal idea and goal, as Bill so eloquently stated earlier. We are not likely to go for someone else's goal. But I bet you will get lots and lots of help if you start and share and need any answers.

OK Off to wind a central core coil just to see what happens...

jeanna

[jadaro2600]

@all

Would anyone happen to have a link to the PDF that was posted here. It was about the navy and magnetic amplification I can not seem to find it.

Thank you!

Lost it - I think I looked at it, and there wasn't much to it - not like the title implies.

Here's an interesting link...
http://www.butlerwinding.com/elelectronic-transformer/mag-amp.html

[hazens1]

Here is a fun coil config. Still testing it, but I can use the 1 toroid for 2 JT circuits or use the coils in parallel or series with a single JT circuit.

7-7-28-7-7-28
B-C-P-B-C-P

[jadaro2600]

Here is a fun coil config. Still testing it, but I can use the 1 toroid for 2 JT circuits or use the coils in parallel or series with a single JT circuit.

7-7-28-7-7-28
B-C-P-B-C-P

...and how is this working out for you?

@all, Concerning the transistor...

After some experimentation, and headache, I've found that the winding traveling to the base from the resistor ( ie, from positive ) can be decreased, while the winding to the collector from positive increased.  This seems to correlate with an increased voltage at the collector...  In other words, more winding on the path to the collector yield more voltage AT the collector - just as any step up transformer would.

Then, at this rate, a magnetic collapse, in the presence of increased voltage, with only two coils, would cause voltage spikes across the coil to the base.  This is apparently what causes the transistor to shut of as current is impeded.

Taking this a step further, we have the pickup coil, which benefits from both of these collapses- however, the current flowing through one isn't the same as the current flowing through the other, therefore the magnetic field density is stronger on the path from positive to the collector, which causes and sinusoidal waves to have a DC offset ( the waveform of the pickup coil is not on center - the waveform isn't true AC, it's more like pulsed DC ).  This is the resultant waveform despite the ratio of the base and collector windings being a one to one ratio ( in many or the designs here ).

I think that a true AC waveform will be in balancing out the voltage generated from collapsing magnetic fields on both the base winding as well as the collector winding - which seems a difficult task.  Taking into consideration a loaded pickup coil, this becomes even more complicated.

...we're left to fiddle.

[jeanna]

Hi everyone, (outer left field particularly),

I am doing something way out there today.
I've been working on this nuts idea for a while now.
It goes like this:

Can I rectify the secondary ac and put that into the battery rail, then run that through a toroid without another transistor? (I would like to keep the manufactured parts down) So, will the input of a pulsed voltage take the place of the transistor? and if so, can I use it to amp-up the output to a high enough voltage to be useful?

But for a preliminary test, I just looked at the quality of what comes out of the bridge.

So here was this afternoon's test:
Take the secondary and rectify it. Not to get the full voltage, but to get the dc pulses.
Now take those pulses and run something with them. I just tried 2 || leds, of course.

So, the secondary through a full wave rectifier shows 18volts (this is one of my very small and simple ones. -for proof of concept-only)

But it is doing it at a pulse of 3.45volts, peak to peak. (as shown on the scope)*

I take the output from both sides of the rectifier and put them into the input of a little circuit and it lights the lights. on the pulse only.

The scope shot sez this is a beautiful and even sinewave. the base line x axis is centered. (I picked the toroid that gave me the most even, but I don't think this is why.- more tests must follow)

So, the uneven pulse of the pickups here is 3.45v and the result is a beautiful sinewave of 3.45 peak to peak.

Test pre-A is now complete and successful.

So, on to higher voltages more pulses and higher output.

Jeanna

* What this means is that the voltage difference between the 2 separate pickup wires is out of phase so much that there is a wave form that "happens" as a result. It is like the beats you hear when the cello string is not quite tuned to a perfect 5th with the next string. The difference of the differences, if you will.