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project:laser_modulation [2015/12/16 19:44] ivan_ahepjuk |
project:laser_modulation [2015/12/16 20:44] ivan_ahepjuk [Transmitting sound frequencies by using the modulated laser beam] |
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| **Introduction:** | **Introduction:** | ||
| - | Hopefully there will not be big fails. Still, It would be challenge to tune and tweak the concept and build robust design. I would like to use green laser, because i got it at home and I think that its strong enough to transfer from my rooftop to the Ema hill. | + | Hopefully there will not be big fails. Still, It would be challenge to tune and tweak the concept and build robust design with using as little parts as possible. I would like to use green laser, because i got it at home and I think that its strong enough to transfer from my rooftop to the Ema hill. |
| - | **step 0:** Think, ask and read how to use laser beam to transfer sound frequencies. Think how to receive this kind of information. Understand the principles. | + | * **step 0:** Think, ask and read how to use laser beam to transfer sound frequencies. Think how to receive this kind of information. Understand the principles. |
| * **step 1:** Do initial design of the transmitter circuit. Use operational amplifiers, no microprocessors, no programming. Use cheap components, think about robustness and simplicity. Find own solution, do not follow allready made and proven designs. | * **step 1:** Do initial design of the transmitter circuit. Use operational amplifiers, no microprocessors, no programming. Use cheap components, think about robustness and simplicity. Find own solution, do not follow allready made and proven designs. | ||
| * **Step 2:** Prove the design by computer simulation, choose right components, tweak components values for the best fit. | * **Step 2:** Prove the design by computer simulation, choose right components, tweak components values for the best fit. | ||
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| * **Pulse-Frequency Modulation**: The main idea is to make laser flashing at the frequency, which I am actually transmitting. In the other words, instead of transmitting sinus of the frequency X, I can transmitt pulse signal of the frequency X and then, after receiving this pulse signal of the frequency X, just make the sinus from it by analog filters. | * **Pulse-Frequency Modulation**: The main idea is to make laser flashing at the frequency, which I am actually transmitting. In the other words, instead of transmitting sinus of the frequency X, I can transmitt pulse signal of the frequency X and then, after receiving this pulse signal of the frequency X, just make the sinus from it by analog filters. | ||
| - | And that is how I decided to do that. If you dont understand this principle, wait for pictures or ask me personally. | ||
| - | **Step 1:** | + | **Step 1:** Initial design: This is basic idea how to build the transmitter. |
| + | * All amplifiers are LM358N | ||
| - | **Step 2:** | ||
| - | **Step 4:** Stay tuned | + | |
| + | **Step 2:** simulation by LTspice (maybe little tutorial how to use ltspice would be more than good) | ||
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| + | **Step 3:** Photo of actual prototype | ||