2 Watts from an old 2N3055 as a solarcell ?

[Mk1]

I have leds that give me from 1.2 to 1.5 volts with 6 micro amp each there red in a clear casing they can be driven by the sun or from light bulb.
3 Of them in series got me 4.5 volts.Now are they cheaper them small solar panel.Just ad a joule thief and voila! Joule thief are small transformer they can be built for voltage or amperes.The 2n3055 may ad amps i did not test it , i cant spare one they are so useful .

[Mk1]

Texas instrument made a ic version of the joule thief , that can be easily powered from form radio waves or piezo or solar , or hall effect even pelletier.

http://jumpcut.com/view/?id=FB209A1A37F511DDB1D9000423CEF5B0

also leds if can get power from the sun where could we find more, we have uv leds ,infrared leds ?

thanks to texas instrument we should make it a better world.

http://mae.pennnet.com/display_article/342401/32/ARTCL/none/none/1/The-Joule-Thief-harvests-vibration-energy-to-power-devices-in-the-field/

a series of transformer will get us a usable output.

[Steven Dufresne]

This topic's been quiet a long time but since it's the right place...

I connected 5 of these 2N3055 solar cells in series and got them to power a small 1.5V calculator using indoor lighting, and of course sunlight works too.

My tests showed that I got the most power using the collector as negative and the base as positive and ignoring the emitter.

It does have to be at most 1 foot away from a 27 watt compact fluorescent lightbulb to work. I'm getting the needed voltage but it's the current that doesn't let me go further from the bulb. I'm thinking of adding a second set of five transistors in parallel to get more current but I've run out of them and the local store doesn't have any in stock yet.

Anyhow, here's a video of my initial experiments with just one transistor:

http://youtu.be/526xslmO6Ds

and here's a video with the five transistors in series (solar panel?) powering the calculator:

http://youtu.be/2bUc8RqSFXs

More photos and write-up can be found here:

http://rimstar.org/renewnrg/make_solar_cell_using_transistor_2n3055.htm

I also did some testing it with a fresnel lens but nothing very rigorous. I figured I'd stay away from the heat issues and just go the multiple transistor route like I did.

-Steve
http://rimstar.org   http://youtube.com/rimstarorg

[conradelektro]

Texas instrument made a ic version of the joule thief , that can be easily powered from form radio waves or piezo or solar , or hall effect even pelletier.

http://jumpcut.com/view/?id=FB209A1A37F511DDB1D9000423CEF5B0

also leds if can get power from the sun where could we find more, we have uv leds ,infrared leds ?

@Mk1

I would like to ask you to post the name (devide number or part name) of the Texas Instrument ic version of a Joule Thief. The link you provided does not work any more.

Thank you in advance,

Conrad

[Hitman]

Hi all,
About 4 years ago I constructed a solar tracker using green leds to power the circuit. I tested different leds and found the greens ones put out the most power.

Cheers Michel