Joule Thief

[Mk1]

This tread is really addictive , and why is that ?

The answer is in you , keep it , good work every one!

Mark

[jadaro2600]

SO the JTC is acting as a blocking oscillator.  In what ways are there available other methods of winding the transformer circuit? ( other than by switching hands, or while trying to drive, etc. )

I've already explored the ferriteless coil around coil; it seems to work except in small applications.

[Mk1]

@jadaro2600

Tell me did you check your copper toroid , it is made of mag wire isn't it ?

If yes tell me dose your core put out voltage?

Mark

[innovation_station]

i used bell wire on the micro mk2


i will build another ...   and see if i cant get my voltage a wee bit higher  maybe drop a few more pick up coils ...


ist

i will use mag wire ....   this time

[xee2]

@ gyulasun

Assuming 1.5V battery voltage @ 42mA  current draw, your input power is 1.5 x 42=63mW  and your output power is 7V x 12mA=84mW.   You seem to have a COP (coefficience of performance) of  84/63=1.33 !!

Your other setup's input power (with the third winding) is 1.5V x 39mA=58.5mW and the output here is 21V x 27mA=567mW,  the COP is 567/58.5=9.69mW !!!!   

I assume that mikem_2au was reporting the open circuit voltage from measurements something like the following circit. But the circuit still is very impressive. It seems to be putting two coils in series to get a higher output voltage. I also hope mikem_2au will provide more information about this and his Fuji board mods. To light an unmodified CFL is very impressive.


BTW, I think your explanations were very good. I hope someone will learn from them.