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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. |
April 29th, 2006
That’s pretty sweet. Good work.
May 1st, 2006
Wow dude
May 1st, 2006
Has anybody got the schematic for this please, flash plugin will not install
May 1st, 2006
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
May 4th, 2006
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.
May 4th, 2006
Many thanks for the help guys
May 4th, 2006
Here is some additional information:
http://forum.hackedgadgets.com/viewtopic.php?t=152
May 7th, 2006
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.
May 7th, 2006
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.
October 26th, 2006
[…] Page Summary: 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. If you had used a different phototransistor with a faster response, would some of the cleanup have been unnecessary. Also because of ambient light, the output would never go low to ground.read more | digg story […]
October 26th, 2006
[…] Page Summary: 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. If you had used a different phototransistor with a faster response, would some of the cleanup have been unnecessary. Also because of ambient light, the output would never go low to ground.read more | digg story […]
May 3rd, 2008
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