Joule Thief

[MrMag]

@ MrMag 

The LED is also a device that limits the voltage across itself (like the neon in my previous edit, but it is not symmetrical). The voltage when the LED is on will be the forward drop voltage of the diode, and the voltage when reverse biased will be the reverse breakdown voltage of the diode. To measure the output voltage of the Joule thief the output should be open circuit (no load except the scope).

jt output with no load

2 ohms  -  13.00 VDC   -  6.65 kHz  - 117 mA
3 ohms  -  12.62 VDC   -  4.15 kHz  - 101 mA

Waveform is identical and I'm still in search of my Transistors?

[gadgetmall]

@IST

Re: Jule Thief
«

gadget your nuts...   lol  Cool

what else you got laying round there lol   got any crystals ....  raw ones...  Cool

i want some one to do a SIMPLE TEST IF THEY HAVE THE MATERIALS ...    bang  or strike a cupple togather

they light up....  hummmm   they discharge a verry formiliar  SPARK  Grin Cool

hummm

just if some one has this laying around .... if not  well no rush .


I didn't want to mention it cause its got nothing to do with joule but maybe it does . I collect rocks and crystals . I got BIG gigantic Quartz Crystals and yes they spark when rubbed together ALSO  i have Chunks of pyrite with gold in em . They really do give off Electricity when i put the DDM on them . you have to move it around until it contacts the right spot but i saw105 milivolts off one not long ago when i was checking out the Hutchison's Effect Crystal thing . i had to try . maybe hook a few of those rocks and run a JT ?I think so.just go to make some pointy probes to hold em in position..

[xee2]

@ MrMag

    Where are your scope probes? The peak to peak output on the scope has to be a least as high as with neon for load or it would not have lit up. Try setting up as you did to measure across neon and then removed the neon and leave everything else the same.

[innovation_station]

sheesh i need a break from winding ...


lol

gadget i figured you would have some real goddies round there ...

jim   i cant waite to see that big jt wound up powering your HUGE CAPS   

mr mags im a fire up my scope now .... 

what are you useing


i have a jt with 7 turns 3/4 ring  1k       2222a tranny

ist!

well that jt is blowen 4 some reason so i grabbed another ... 

this one has 11 turns 1" ring .. with a 3904

i scoped the wave

[Mk1]

@all

I think we are running after our tails, i seems it will show the load voltage, we should try to find the maximum load.