Joule Thief

[jeanna]

Jim,

Didn't you make this a while back... then something happened to the switch... then I never heard about it anymore??

I am glad it has returned.

thank you!!

jeanna

Jim

That is interesting .......so my  new  discovery is  ancient history   


gary

Gary,
Those are the best discoveries. Then you know you are on to something!!
Are you using welding rod too?

jeanna

[jeanna]

Gadgetmall,

I just made a little breadboard jt with one of those germanium transistors.
It lights beautifully down to 1v, but my eb is 0.835 today.

I put a supercap like the one Bill used last year to light his led directly from the eb, but this didn't work. I added a diode which I put in wrong the first time then fixed, and it didn't work either.

What is it you add to a basic joule thief that you do so normally and I don't do that will make this work?

More caps? base caps of some size... tiny or big?
extremely low value resistor?

Do you use white led?

etc?

thanks

jeanna

[resonanceman]

Now, I am still confused about your secondary

If the spool with the taps is the primary (and I thought it was the secondary before,) and you have 300 feet or is it 300 turns? Are you stepping this up or down? Is it a filter type of thing?

Jeanna

OK
I will  try to keep this  simple .........but be prepared to be confused   anyway .

choose  any 3 consecutive taps  for your  primararys    ..... with this particular  coil  that makes the   primarys 90 ft long .

For maximum  voltge     you need the  secondary to be as long as possable  .....so  lets   go with 300 ft . 
The   magneitc  flux induced  by  your primary  coils   will induce voltage in ALL the other coils ........ the  fact that   some of those  coils are also the  primary  doesn't seem to matter much .
The   current is induced where it is induced ...... 

I am sure that there is  some  " leakage "  between  coils ......maybe quite a bit ............but it is not  noticeable in the  behavior of the JT
The  LED  was brighter  than  my  other LMs
It may suffer in its ability  to  output power ......it is to soon to tell  about that


gary

[jeanna]

choose  any 3 consecutive taps  for your  primararys    ..... with this particular  coil  that makes the   primarys 90 ft long .

For maximum  voltge     you need the  secondary to be as long as possable  .....so  lets   go with 300 ft . 

...
The   current is induced where it is induced ...... 
gary

OK thanks.
It is very clear.

It may suffer in its ability  to  output power 

and then who cares if you are lighting lots of lights with just a bunch of coiled wire?

this is 1.2v battery isn't it?

jeanna

[electricme]

@Resonanceman,

Jim

That is interesting .......so my  new  discovery is  ancient history   

gary

No Gary, it means you have discovered "another" way to do this , same principle, but another way entirely.
When the 1st way was discovered, there were no Toroids about, none of those hi powered magnets either.

But you have been able to show us all here that you have been able to combine these "new" technologies to do something which was older, clunkier and took more effort.

Well done.

jim