YouTube user ChibiChn has come up with a complex but accurate method of transmitting sound using a laser beam. He uses some 555 chips and a small laser to transmit the sound using laser light. Then a photo transistor, a comparator and a audio amplifier are used to receive the laser light and convert it back into audio. The result is audio that is slightly lower than CD quality. There are much simpler methods of doing the same if high fidelity is not needed.
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That’s pretty sweet. Good work.
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Wow dude 🙂
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Has anybody got the schematic for this please, flash plugin will not install
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Hi Sheepdog,
I couldn’t find a page with more info… Sorry. If anyone else knows a web site for this project please leave a comment with it 🙂
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Hey everyone, I’m the guy that made the laser music link video. I actually made this for a project in my Lab III class at the University of Oklahoma. So, if anyone would like a schematic, or a copy of the report I wrote for it, feel free to email me at ChibiChn@ou.edu. I’d be happy to answer any questions. Since I made the video, the circuit has gotten significantly more complex, and reproduces audio with much less distortion due in part to a much better filter design, but the general idea is still the same.
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Many thanks for the help guys
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Here is some additional information:
http://forum.hackedgadgets.com/viewtopic.php?t=152
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Nice. If you had used a different phototransistor with a faster response, would some of the cleanup have been unnecessary? I like how you approach each issue in recovering the data — nice video. I did a simple amplitude modulation one here.
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Even if I had a better phototransistor, I don’t think it would have been possible for the laser to fully saturate (giving an output of Vcc), without drawing much more current than necessary. Also because of ambient light, the output would never go low to ground. The nice thing about the comparator is that it’s output goes from 0 V to Vcc which makes it nearly identical to the output of the transmitter, sans extra width.
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