Joule Thief

[gadgetmall]

Make a bifilar jt first to get , it working , 10 turns should do . the pickup coils will work any way, also did the led work in its collector to emiteur regular connection.

You have done a working jt  already then disregard comment , so take the one you have to test first  , just put a additional coil , it the jt is bifilar the place you put the pickup coil is very important . Some toroid just dont work well in the mk type windings they need more turns to be effective with those you go bifilar.

I use 4 turns one the jt side because my toroid permits it first .

Mark

@gadget

Welcome back !

Hi Mark I agree . Some torroids like a yellow one i have here wont work Mk2 Style or any other style other than a piss ant bit of light no matter how many or less turns . I usually can know if the torroid is any good  if just 3  to 7 turns of twin wire . If it don't light the normal way BRIGHT  its a piece of trash . Hunt for more !!! I got one i thought was plastic it was so light weight but a magnet sticks to it and it works very good ..


Gadget ..
Gadget

[Mk1]

@altrez

First take the one working but without the led then try a coil on it make sure you don't put the coil over the ends of the jt coil, it worked for everyone , so there is something wrong , do you have a camera , also what is the transistor and resistor you use. and you tried the led directly on the pickup coil and nothing else on it , no connection to the battery here.

Mark

Edit also the magwire is coated you need to remove those at the end of the wire for it to work, just use a lighter 22 gauge will not burn , but don't try that with 39 it just burns away.

[Mk1]

@all

On the mk8 i connected all the pickup coil in series , starting at 4 coil i get sparks when the ends touch each other , i am still having issue with connecting then together matching them to get the full output.

But its a great unit.

i get about 100 volt per 30 inch pickup coils , i tested up to 90 inch.

Mark

[Mk1]

I got a idea , smoke alarm , are built around electric sensor could those be used to get more energy from those toroid jt. Maybe more effective then am tuner.

[jadaro2600]

@Mk1

You recently posted a toroid design where the coils crossed the toroid; did this work?