Joule Thief

[jeanna]

.... magnet on the rim of the rotating disk....

Oh I see.
Yes, I think there are a few.
So, by starting it up, the permanent magnet excites the electro magnet, then it gets interrupted and stopped and then starts up again which creates a back-spike thing which further excites the electromagnet then pushes the motor along for another cycle.

I have missed this, or I am finally ready to understand it.
Thanks,

jeanna

[jeanna]

The green thing is indeed some 300 ohm pot. It did nothing to the led intensity, i assume that i am now even close to the proper resistance value.

thanks.

I did not notice heat but usually it means there is a short somewhere .

I checked everywhere, and the battery was cool everything was fine and yet the coil was warm.
This means to me that there is oscillation happening in the coil.
I wound it wrong too.

thank you,

jeanna

[Pirate88179]

Jeanna:

Yes, that is the pulse motor.  Using a bifilar coil like Bedini does one set of windings acts as an electromagnet, and the other acts as a coil to get the pulse of the magnet going by.  Very cool when you think about it.

Bill

[jeanna]

Yes Bill,

What I was just realizing was the fact that only one coil - not bifilar-  was enough to turn the reed switch on and off like the transistor.
I was really under the impression that 2 coils were necessary for the on and off thing.

I totally missed that element in the bedini, but of course he uses the transistor.

I guess I will go after this tomorrow.
I have 1 reed relay from rs, and 2 micro micro reed switches from goldmine. They probably need to be bigger, but they will probably be fast.    Hopefully they won't get welded right away!
I will let you know.

[this has major stubblefield implications of course. Others have mentioned it but I did not even try to understand back then.]

jeanna

[xee2]

@ jeanna

It is not that complicated. The magnet closes the reed switch (briefly as it passes) and pulses the coil which acts as electromagnet to pull or push magnet (if it is positioned correctly).