Joule Thief

[resonanceman]

I think that you are right. I thought that maybe adding a ferrite core it will work. It only flashes the led when I disconnect the base wire suddenly.

Jesus

From  my experience  if  tapping  on a  connection with the wire that  goes there   makes  the  LED flash   you  are close .      It is working   , it  just won't  keep working on   its own
'

gary

[infringer]

Thought I would share this from keelynet sorry if it is a double post.

http://www.youtube.com/watch?v=KtgyyNk5GEQ

[dllabarre]

@ dllabarre

Thanks for the report. I think your results are better than most because you are using more turns for your coils than most people do. That should give you more output voltage. To check your output voltage remove the LEDs and put a diode on the collector with the non-stripe end to the collector and then put a capacitor from the striped end of the diode to the emitter. Then measure the DC voltage across the capacitor. I suspect you are getting about 30 volts. That should light a lot of LEDs.

yup - I got 29.5 volts across the capacitor

DonL

[dllabarre]

Don
Sounds  good
You might be able to  get the  current  a little lower   if  add a cap across  the  pot to make a tank
The  tank  resonates  ......the  output  goes up and the current draw  goes down

gary

with a 10uF 16v capacitor across the POT my amps drop from 748mA to 110mA.

DonL

[electricme]

@ Jesus,

It is a pity that I sent for 5w resistors but I did not know about the 1ohm resistor, if I knew before I would have sent for at least 4 of those resistances.

Lets see what I can do with what I got now.

Jesus

OK, try a 12v tail light, globe, they are designed to work better than a 5watt resistor, and can handle the heat very well .

jim