Bismuth core Joule thief

[Mk1]

@all

I got one more idea last night , i personally don't have the tools and materiel , to build it , but maybe some of you do ...

We need to build a toroid from Bismuth ...

I have gathered some info on the subject .

http://www.youtube.com/watch?v=t-9SQfDzZn4

http://www.youtube.com/watch?v=hUoUSz-hD8A

http://en.wikipedia.org/wiki/Bismuth


Mark



 

[jadaro2600]

Looks interesting.  Any other results to report? ...it might not be so difficult to make a mold for a toroid, all that's needed would be a pre-existing toroid.

Lead is also diamagnetic.  ...meaning that most bismuth alloys would also work just as well.  They may even melt faster for you.

[resonanceman]

Looks interesting.  Any other results to report? ...it might not be so difficult to make a mold for a toroid, all that's needed would be a pre-existing toroid.

Lead is also diamagnetic.  ...meaning that most bismuth alloys would also work just as well.  They may even melt faster for you.

It would be great if bismuth could  be used for toroids.
Thinking  that lead free solder should  have alot of bismuth I tried  a few coils........ so far I have not  got any  of my tries to oscillate at all

All of them have been made  with bifilar twisted pair...... at least 16 turns....
The largest core was a 1 pound spool of solder.... the smallest  was about 14 inches  of solder.

tomorow I may try adding  a few wraps of solder to a few  working JTs just to see if anything happens


gary

[Pirate88179]

What is the reason for this?  If you want a material that magnetizes and de-magnetizes instantly faster than ferrite try Met-glass.  Otherwise ferrite is the best choice here.

Bill

[jadaro2600]

those lead-free solders are mostly tin.