Joule Thief

[jadaro2600]

An interesting thing just occurred to me:  Has anyone thought of using a broken washer for their 'toroid'.  I think they're called lock washers ( not the star shaped one, the ones with the break in the form )

By placing the windings of the primaries ( + to collector ( red or black ) and + { resisted } to base ) nearest to the break in the washer - the primaries are proximal to one another, yet distal through the conduction of the broken washer.  Eddy currents are minimized through a broken ring - their path is limited.

Placing the tertiary ( blue ) ( secondary, aka pickup coil ) between these two .. wouldn't this sequester flux voltages?

Here is an image - I'll just have to draw it by hand.

[TheNOP]

Thanks again. On the alu and copper issue there is heat dispersion factor i know both are good , alu is a good rf shield i don't know for copper it works but what is best , also copper to alu it doesn't connect electrically it need special connector
humm its like electricity doesn't travel in the same state in both. Its said that alu is 2 time better conductor then copper that is per weight.

for heat sink copper is a bit better(recall from my physic and electro classes).

for rf i don't know, probably copper is a bit better but any metal should be able to shield rf adequately.
iron is use for most apparatus and shielded cables mostly use alu, but this might be for $$$ reasons

per weight i don't know.
what i know is: that for same current rated wires, you need 2 times the wire size with alu, compaired to copper.
since the resistance is different, both require different wire side connection surface for same current rating.

alu
2.7 g/cm3
28.2 nΩ·m

copper
8.96 g/cm3
16.78 nΩ·m

edit
that would be a bit less then 2 times for the size also a bit less then 2 times by weight
if i calculated correctly...

[TheNOP]

My best guess is that I need to order a toroid that works with a pickup coil and that others have had success in adding a pickup coil.

before doing that, give iron a try, a coat hanger or even a 2~4" nail will do.
build the jt as usual, when it work whind an other coil on top of the 2 others.

[altrez]

@TheNOP

Thank you for the advice. I will give that a try and see what happens

[innovation_station]

00000OOOOOOOoooooo  my

lol

so im winding my big cores ... 

and i get to thinking lol ...      how bout ....   mk2 style ....  hv 1 side low v high current the other lol lol 

ist!