Joule Thief

[Mk1]

@pirate

Have fun ! try anything , test everything for power , if the meter don't show anything try a led on it anyway!

@sparks

Thanks! for all your contributions!

Mark

[xee2]

@ Pirate88179

I do not think it makes much difference if secondary is bifilar or not. But I think a good experiment would be to make a bifilar secondary and then see if there is any difference between a single wire of the bifilar secondary and both wires tied together as a single wire for the secondary. I would not expect much difference but Jeana is seeing a higher voltage with a large diameter wire for the secondary so maybe using both wires together as one wire will also increase the secondary voltage.

EDIT: Correction, I think jeana was seeing same voltage but more current with larger diameter wire. If each wire of the bifilar produces the same voltage and current then putting them together should give an output with the same voltage but twice the current.

EDIT 2: The wires are like separate batteries. If two batteries are put in parallel the voltage is the same but more current is available.

[innovation_station]

well my little mot / laptop power supply pulse charger has been running a few hours now and it is rechargeing my dead battery ..

it is holding a charge dont think it is useing much power from the wall   i have not checked there is a tiny amount of heat in the laptop charger and a tiny amount  in the transformer  other than that ...  seams to be fine battery is at 4 vdc now ...

i used a diode as it would not hold the charge in the battery it wanted to flow back out ...  noticed this after a bit .... lol

the yoke is done i will post a pic ..  have not played it yet

ist!

i also want to build a 2 or 3 cam tranny board to drive the 1 watt led at full brightness

[jeanna]

  Can a secondary be wound bifilar?  Where there be any advantage to doing this?

Yes, please do this.
It is what I was doing and I want replications.
EDIT: MK1 was also doing this although his design was different in other ways as well.

Or, is it not a good idea to try?

go for it

I am going to try some simple single wire single turn, then a few more turns, to see what I can get.  I am going to try the induction method of connecting the secondary. 

thank you.

please do it,

thanks,

jeanna

[Pirate88179]

@ MK 1:

Ok, thanks, I will see what happens.

@ Xee2:

Yes, thanks for the info.  Tying the bifilar secondaries together would in effect double the mass of the wire. (single wire)  I guess the only way to find out is to have a go at it.

@ Jeanna:

Will do.  I knew you were ahead of me on this.  I will go back and review your posts and then give it a go.  Thank you.

Bill