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project:laser_modulation [2015/12/16 19:46] 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. | ||
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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:** Initial design: | + | **Step 1:** Initial design: This is basic idea how to build the transmitter. |
+ | * All amplifiers are LM358N | ||
- | **Step 2:** | ||
- | **Step 3:** Stay tuned | + | |
+ | **Step 2:** simulation by LTspice (maybe little tutorial how to use ltspice would be more than good) | ||
+ | |||
+ | **Step 3:** Photo of actual prototype | ||