Joule Thief

[gadgetmall]

I got them from xee's posted source. um battery station, something.
I think gadget's link was to the manufacturer and I don't remember any price on that site, just a little information.
It also showed other products beyond the tiles. I like the idea of an acrylic sheet that can be cut to shape. (the crazy artist in me gets all excited about stuff like this.)

They are surprisingly bright with very little input.
It is very foggy this morning and I put a couple in the window for 15 - 30 minutes. I didn't even need to get into a dark room to see it brightly glow. In the window it looks a dull greenish color, then just to the side of the window the whole tile becomes a brilliant glow.

I think gadget and maybe ist should buy them to sell on their websites- they must be pretty cheap to be able to retail them for 50 cents.

jeanna

Glad you like them . I knew some people would like those . I bought a hundred several years ago from a group buy from the manufacture in turkey . You have to Buy a Pallet of them @ 800 dollars shipping included .  since then the new source i have bought several 100 more in aqua and green and i do sell them but not for 50 cents . I like the aqua the best ! I have sold many at the flea market for 2 dollars each . I also have some inlaid on My patio as a walk way light . . A pallet i believe could do a 12 foot square . .Ive got about 120 left and i will keep em in stock because when the station runs out we wont have another outlet unless we do a group buy .they make Great Christmas Presents too . A Uv led will light them up bright !

BTW Those TOPHAT leds or as China calls them  STRAWHAT leds are the whitest and brightest i have ever seen  for 115kmcds . they are short and fat and have a 140 degree viewing angle . I recommend them Highly . they spread the Blinding light out rather than up and come in 220kmcd also .   . that's all for now guys .I'll be selling strawhats on site next week .  Nite .
Sweet Glowing dreams

Gadget

[gadgetmall]

i promise to upload pictures and diagrams when im done, this is a good project for many people, let me explain.

i have common household metals in the ground outside, these metals produce a decent current however there are some minor details to note about this current.

A)  it has a voltage POTENTIAL of 0.940v but has a constant voltage under load of 0.6v it has a ampere POTENTIAL of 4mah but constant of 2mah.

it currently is enough to light a LED but not brightly. i am trying to work it out to power a 13w CFL. i will need your help to get there however. 

what is the current highest frequency schematic? i have seen one with a 10uf cap in parallel with the bettery  and a base resistor of 500k with a 1000uf cap. the turns on the torroid were 2 and 5 respectively. is this our best? 

at worst i think i can light the LED to full brightness off of less than we have seen to date and at best i think i can light a CFL!

i will need to know a higher freq curcuit to continue my work, i can experiment till i find one but if someone could point me to it that would shorten my time span significantly as i do not have a osciliscope.

thanks

that would mean you you would have be beat me 0.19 volts at 0.20 ma Bright white 

Gadget

[Pirate88179]

Glad you like them . I knew some people would like those . I bought a hundred several years ago from a group buy from the manufacture in turkey . You have to Buy a Pallet of them @ 800 dollars shipping included .  since then the new source i have bought several 100 more in aqua and green and i do sell them but not for 50 cents . I like the aqua the best ! I have sold many at the flea market for 2 dollars each . I also have some inlaid on My patio as a walk way light . . A pallet i believe could do a 12 foot square . .Ive got about 120 left and i will keep em in stock because when the station runs out we wont have another outlet unless we do a group buy .they make Great Christmas Presents too . A Uv led will light them up bright !

BTW Those TOPHAT leds or as China calls them  STRAWHAT leds are the whitest and brightest i have ever seen  for 115kmcds . they are short and fat and have a 140 degree viewing angle . I recommend them Highly . they spread the Blinding light out rather than up and come in 220kmcd also .   . that's all for now guys .I'll be selling strawhats on site next week .  Nite .
Sweet Glowing dreams

Gadget

Al:

I am going to try to get some of these glow things soon as well.  I'll have to check into your tophat leds as I was not really impressed with the light output of the ultrabright leds I got form goldmine (they have 5 chips in them) rated at 265,000 MCD.  I compared them on the JT to the ones I got that were rated 28,500 and yes, they were brighter, but not enough in my mind to justify the additional amp draw.  My rough guess from eye observation might put them at 3 times brighter, but no more.  I believe they draw 100 mA's each to be fully illuminated.  I think I would rather have a bunch of the 28,500 guys before I got any more 265,000 leds.

How do your tophat leds compare to what we have seen so far vs amp draw?  (not actual amp draw, but their rating)

I am also not impressed with the 1 amp leds that are out there now.  Yes, they are bright, but, at what power cost?

I trust your opinion and if you think the new leds are something to try (as you just said) I will do so.  Thanks.

Bill

[jeanna]

So far I have got the spark from the stun gun to about 1 inch. I know I can do better but will need to make a better spark gap. Once I move it too far I can hear some serious hissing.

Hi Altrez,
I am not sure how the stun gun applies to the only info I have. Here is that info.
If you put 2 balls or rounded rods 1 inch apart and pop a spark between them, a 1 inch spark means you have 70kv.
A 1/2 inch spark means 40kv and
1.7 inch spark means you have 90kv.

In this table you must move the balls apart to the separation I mentioned in order to get the right spark length.

Since a stun gun sends the spark outward, I do not know if or how this applies.

The tesla coil on the roof of that museum as we saw yesterday was using megavolts to produce those outward sparks.

I would guess if you could find the research done by Herz that he used for his frequency studies, you might find the information you need. (It is probably in german from the mid 1800's - good luck!)

Tesla referred to the work of Herz when addressing a group of electrical engineers and he did not need to go into any details about what Herz had done. It was well understood. Maybe you can find it, by following that trail. I am curious about this, but am more compelled to follow other threads.

jeanna

[Pirate88179]

@ Jeanna:

I too have seen spark distances quoted for the voltage levels needed to create them.. But, Dr. Walter Lewin (MIT) says this is very dependent on the humidity.  He says this can change that distance by a factor of 100%.
In other words, in the winter, when it is dry inside you can get a spark to jump 1" using x volts.  In the summer, especially on a humid day, that spark may now only go 1/2" at the same voltage levels.  So, we might just have to use these figures as a guideline for comparison purposes.

I have no idea if he is correct or not but, he is Dr. Lewin of MIT and this point was made in one of his online lectures I have been watching on Physics.  I just thought I would pass this on.

Bill