Joule Thief

[stprue]

There is a site that gives free a 200 transistor circuits, oscillators are included.
The link: http://www.talkingelectronics.com/projects/200TrCcts/200TrCctsFrontice.html

Jesus

Sound familiar...JT

   LED TORCH with  1.5v SUPPLY
This simple circuit will illuminate a super-bright white LED to full brightness with 28mA from a 1.5v cell. The LED is 20,000mcd (20cd  @ 15° viewing angle) and has an output of approx 1lumen.
The transformer is wound on a small ferrite slug 2.6mm dia and 6mm long. It is made from F29 ferrite material as the circuit operates at a high frequency (100kHz to 500kHz).
The efficiency of the circuit revolves around the fact that a LED will produce  a very high output when delivered pulses, but the overall current will be less than a steady DC current.
BC 337 has a collector-emitter voltage of 45v. (BC338 has 25v collector-emitter voltage rating.) The voltage across the transistor is no more than 4v as the LED absorbs the spikes. Do not remove the LED as the spikes from the transformer will damage the transistor. 
The circuit will drive 1 or 2 while LEDs in series.

[the_big_m_in_ok]

For re-sizing images you could use Irfanview (freeware).
Open the image in irfanview and then press 'CTRL R' and choose a new size.
A good size is 600 wide.
Save it and upload.

Please do.
I don't have a computer, so I can't try and change anything by editing that I see on the post.

--Lee

[WilbyInebriated]

you don't even need to go download a program to re-size images...

http://www.pixlr.com

[protonmom]

Woo Hoo!  I cannot believe my luck!  Sure hope it holds out a while longer!  Today I got ANOTHER garbage bag full of disposable used cameras from the local store!  That now makes a total of 575 cameras for me to work on!  No excuses anymore.  No matter how much I like winding my own toroids, it is time I put some of the cameras to good use.  Ist, I just might be calling upon you, and on the other members, too, of course, for some ideas.  I just know there is a great project waiting in those cameras!

[Pirate88179]

Hard to see in this photo but, this is a 5 gallon water bottle containing 200 leds.  I have set this up to run from the grid, and, once I install a modified Fuji, it will run on a single AA battery so it can be taken outside, or anywhere.  I just made it tonight and will install the Fuji here in a bit.  Then, I will make a video so you can see it better.

It's kind of cool and puts out a good amount of light.

Bill