Joule Thief

[innovation_station]

sounds awsome the nop

i cant waite to see it !!!!!! 

guys im just testing a mk1 nano  the 1 pictured on  web page .....

im getting a constant 44vdc 1 winding ....

i will check for 25 leds ... next


but it should be close

ist...

TIP ......  i leave 6 " of wire to tune it     i can add more or take away to find what is best suttied for the perpous...

[TheNOP]

Have you a picture of your core?

i am very sorry, i have no digital camera not even a webcam.
only an old 35mm reflex camera.
no scanner either. 

i will have to borrow one.

[electricme]

@ ist
I have an idea, silly of me ha ha ha ha ha, butu think about this.

Alter the profile of the current LED, to beam the light output.

Huhhhh!!!

The clear top section of the LED is in the shape of a dome, it is done this way to try to spread the output light so one can see the glowing from a certain angle. I have seen a couple of LEDs with flat faces

OK, use some type of cutting instrument, (I need bill here he knows the best cutting instruments avaliable) and cut the top of the LED OFFFFF at 90 degrees perpendicular to the side.

ie looksee here      [___]   pretend this is an upside down LED he he


Then get a sharp drill and drill down into the top, in the center of the LED.
Why do this? (mutter mutter mutter say the purests)

because the led puts out coherent light like a laser beam, now stick this modified into a torch and see just how far it will cast its beam.

I havent done this so I dont know if it will work, but a drill cutting faceing I think is at 90 degrees, so if the LED light is not focosed, then it should be when it exits the LED.
A word of warning, this will be injurious to eyes so be careful, just think what a star LED would do, turn it into a JT search light.

@Koen1
If you are getting your JT to light just 1 LED then you are making headway, because I bet you sure cannot make it light up just using the single 1.5v battery cell.

jim

[altrez]

Hello Everyone,

This is my first post I successfully built a JT using the instructions from evilmadscientist.com! It works great and I can light 20 10mm LED's with no problem at all. My fluke tells me that I am using .879 on the battery with a 6.14 mA draw.

I have also been playing around with the fuji mod and was wondering what type of CFL's everyone is using? I can not seem to get one to light at all. I can get the small 4 watt GE tubes to light just fine they are not very bright but they will light. I have tried to light the 10 watt CFL's modded but they wont even flicker. I have also tried the 45 watt CFL's from wal-mart as well, no luck.

I tested the output voltage on my mod and my meter reads 238 V AC. if I connect this to my modified CFL I can test right at the leads of the CFL  and it is still reading 238 V AC going in. And not even a flicker? Any ideas?

Oh and another strange thing is that if I take an unmodded 15 watt CFL and screw it into a lamp, then run the Leads from my fuji board and when i say leads I am talking about the two that did go to the big cap. I place them on the lamp cord the part that plugs into the wall. The CFL will come on at half brightness and half of the tube lighting if that makes any sense at all

Any help would be great!!!

Thanks!

[Koen1]

Good work Koen1. I think your systematic approach is much needed. I appreciate it. I don't think we are getting ou. But we are making useful what was otherwise wasted. Evidently, THAT was a considerable amount of very useful energy.

Thanks and yes I agree that using the battery power that was otherwise wasted is indeed a good thing.

Keep on. The work is good and will give you more results.

Well I hope so...

BTW I needed only one turn for one led, but I needed 8 turns to light 12 (I think 12 or 15) and this is from that little one with out any improvements from MK1. So, keep on keeping on.

So that's just a pickup coil around a basic JT then?
See, that's what I have some trouble with here...
Why is it that you can use a single turn pickup for a single LED, and some apparently can light quite a number
on a single turn pickup coil, but I seem to be getting out only barely more than the basic JT puts out?
Well, I just don't get it....

I'm going to play around with a few variations but after all this time trying I'm starting to get a bit annoyed
with my toroids here... Tried all kinds of things and not once got anything like the grand outputs some
others are talking about...

I may just toss the entire JT part in the bin and try to make a simple 1:200 trafo and simply use the
transistor to pulse the primary or something... that should also be able to run off 1V and nearly "dead"
batteries and should also transform the input to 200 times that voltage...
Lol yeah ok I won't be able to wind a 200 turn coil on those small ring cores at all, so I guess it'll
have to be a larger old transformer...
Any "back emf" effects seen in the JT should also occur in any other pulse fed trafo, shouldn't they?
So just hooking diodes up to the coils at the right spots should be able to pick some of that up...

@Jim: Yeah ok, you're right in that I can't make the LED light from the single AA battery,
and that it does light from that same single AA when a JT is used.
doesn't even matter how many turns you use on the JT core, as long as the basic two JT coils
have an equal number of turns. So a ring core with a total of two turns can already produce the
double voltage at half the amperage of the feed current. That part is simple enough.
The basic JT I can build and it will work, no problems there.

It is the expansion, the upgraded versions that use pickup coils, that's what is confusing me.
Most claims of these pickup versions seem to include significantlygreater numbers of LEDs
lit with multiple pickup coils and some even include seemingly ludicrously high voltage DC output.
This is the part I have trouble with and cannot seem to replicate.
I just do not see much greater numbers of LEDs lit on my pickups, I see like one or two more in total...
I do not see enormous DC output, I see exactly what can be expected from the trafo and the input,
coming from a DC connection with a capacitor in parallel that retains a higher charge than the
feed current. That doesn't really show any excess energy or energy gain or whatever at all,
which seems to be in contradiction to what some of the guys here have apparently been getting out.
And this is becoming quite frustrating. People saying I'm on the right track while I just see
the same old dusty track I was on before... 

Regards,
Koen