Joule Thief

[jadaro2600]

Hmm,Jadaro,

What am I missing?

I cannot see a difference in the 2 pictures. I expected the cap to be in different places, but, I am not seeing any difference.

thank you,

jeanna

Nothing, it's only different in the circuit diagrams.  I just posted one without the lights on.

[innovation_station]

i used a 9v batt with my 1 " mosfet irf840 jt

i made a video months ago of it i never released it public

it was sent over seas as i understood..... 

i will look for the video i made and sent ...  so im NOT FUNDED FROM THEASE PEOPLE SO I CAN NOW RELEASE IT PUBLIC ...   

so ya

lol

im digging ...

ist! 

it was on a scope aswell ...   

i have others too ... same thing lighting BULBS......  DIFFRENT COIL ......SAME THING 

see how youtube likes me today .....

[jeanna]

@Jadaro, OK thanks. One is a lot easier to see.

Just before I changed my winding to be exactly (not just conceptually) like Hazens, I took another look at the waveforms. But this time I added a 104pF (=100,000pF) ceramic cap across the base resistor / base and also put a yellow led (15cents) in the bjt spot.
So, the voltage across the secondary pickups went way down. One way it was 4volts and the other I forget 8 or 12volts peak2peak.

The wave is much more smooth. - much more what I think I need to run a normal toaster etc.

So, here are 2 pics 100k each, so maybe 2 posts??

jeanna

[xee2]

@ jadaro2600

There are two configurations shown - either works.

The circuit with cap going to positive end of battery is better since there will always be enough voltage to turn on transistor when the transformer allows current to flow into base. The other circuit will only work if transformer charges cap to at least 0.7 volts, which may not happen if capacitor has large capacitance.

[xee2]

@ TheNOP

Good transformer reference, and its free (best kind).