AC from Joule Thief Secondary/pick-up

[jeanna]

Hi everybody,

I decided to start this thread as a place to explore using the AC which is produced by the joule thief pick-up as AC.  (And not turn it back into DC)

So many of us have worked with the joule thief circuit (jtc) with Secondary/pick-up; and we have been successful in many ways. I have been delighted with the results I have had using the secondary/pick-up. With the scope it is clearly an AC wave. The x axis is somewhere close to the center of the wave.

As an AC phenomenon it needs a different approach from DC to get the greatest results.

My surprise 2 tier circuit gave me a hint at the possibilities and now that I have accomplished my first lighting of a fluoro tube with a hand wound toroid, it is time for me to address this.

[BTW, the regular joule thief thread started by Pirate88179 is the beginning of this thread. And, I consider this thread to be a thinner thread spun off from that one. Reading that thread is probably a prerequisite for anyone here.  sorry, there are no shortcuts.  ]

My favorite inspirational drawing is below.
It may need explanation and I will add some of that through the day today.

I don't know when my time will run out to modify this initial post, so, I just want to say that in the drawing below is a set of options for using the power from a generator.

Half of the drawing deals with power from an ac generator and the other half from a dc generator. It didn't matter where the initial generator was.
This is true for us as well.
I use a 1.2v battery and stprue uses a variation from the wall power that makes his dc 1.5v as well.

We are not making our pulses by "disruptive discharge" instead we are using a transistor. So, for us, the story begins after the first connection, I think.
However, it is always a good idea to see the whole story, because there may be a clue to an innovation we can use in our joule thief circuits.

I invite anyone else who wants to explore AC from the JT to join me... and help me and others accomplish in this specific direction.

thanks to all,

jeanna

[nievesoliveras]

Lady @jeanna

Count me in.

Jesus

[jeanna]

Welcome, jesus!

and thank you,

jeanna

[Mk1]

@jeanna

Do you see any difference between the different type of jt (bifiliar- or other ways you tested) when it comes to the pickup output .

Mark

i Guess some scoop shot of the jt Vs pickup coil out , could be a good start .

Anyone !

[jeanna]

Hi MK1,

Sure, The toroid itself makes pulsed wave with the x axis on the bottom. (or top if the wires are reversed.)

so it is_____||_____||_____||_____
sometimes it is irregular like
_____||_|_||______|_|___|__|___|||_|||_____|__|__

Once the secondary is wound the pulses go down as well as up.
Sometimes they are also irregular.
If the secondary is wound all one way the all the way back it looks somewhere in between the second line above and one with the spikes going both ways.

The MK1 has the best quality wave, without a doubt.

The thing I do not know, is if it matters. I think it should, but if the pulses come very fast the effect may be the same. I do not know.

I would also love to have someone with a scope that works on a computer and who has a MK1 wound compare it with the other types.

It can be very smooth with a capacitor at the base resistor too.

I saw one of those last night with the toroid bifilar and cap. It looked like this
_____/^{^}\_____/^{^}\_____
sort of wide spike going up along a line.

jeanna