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Would this LED idea work? Answered

Hello, I was thinking about this concept all day today, in which two potentiometers could vary the voltages to 2 of the 3 legs on a biocolored LED, thus being able to produce many different colors. I figure that I could hook up 3 volts, then (in parallel) hook up the two potentiometers to two of the leeds off the LED, the third being the ground. I'm not exactly an electronics guru, (and I hope that I had my vocabulary right in my explanation), but would this work? Also, where can I get some bicolor LED and potentiometers with knobs?

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guyfrom7up (author)2008-03-03

it'd work you should have the potentiometers in series with the leads, and ground simply being ground. You couldn't produce all of the colors, but a bunch (only 2 colors, you need 3 for all of the colors). I'd also install some safty resistors so that you don't acidentally turn the pot all the way down to 0 and burn out your led. Just put something like a 330 ohm resistor in series. I'd use 10k pots.

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Jackhole (author)guyfrom7up2008-03-03

Hey thanks! Yeah this has been bugging me all day, part of me was convinced it would work, part wasn't. I think I'll put the LED in a Ping-Pong ball, it diffuses the light nicely and it looks cool. I'll post an instructable when I make this. And if I used a 3 volt power source with a 3 volt LED, would I need any safety resistors?

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guyfrom7up (author)Jackhole2008-03-03

well, I'd use something like 5 volts, I think you should use a resistor... but I'm not sure careful when you open up pingpong balls, it smells nasty inside. Anybody who wants to try: Put a ping-pong ball ontop of a running heat gun so it levitates. After about 15-20 seconds it'll be all deformed and sweeled and stuff.. THen it bursts, a terrrible smell that will stink up the area for weeks. The remedy: Run fans, spray like 2 cans of that spray that makes the smell go away, not covering it up, it's like out or something. Took 2 days with all of that little bit too much curiosity.

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Goodhart (author)guyfrom7up2008-03-03

I'd be careful with that. Some pingpong balls contain what seems to be somewhat flammable gas.

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Jackhole (author)Goodhart2008-03-03

Yeah maybe it was flammable gas that burnt the plastic? Burning plastic is pretty bad for you.

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Goodhart (author)Jackhole2008-03-03

Yeah it is, and some plastics are much worse then others (PVC for instance)

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Jackhole (author)guyfrom7up2008-03-03

Haha nice story, at least you got 20 seconds of levitation out of that. And I suppose I will use 5 volts with some resistors, thanks for your help.

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