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laser_transceiver [2014/11/11 13:43]
cwh0009
laser_transceiver [2014/11/11 15:34] (current)
cwh0009 [Experiments/Demonstrations]
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 ====== Overview ====== ====== Overview ======
-The laser transceiver is a free space optical communication device that encodes audio on a laser beam using pulse width modulation (PWM). A single transmitter and receiver unit can be built for about $15-$20 in parts. We used to use this for a demonstration in ELEC 3030 (RF Systems Lab), but aligning the lasers took quite a bit of time to setup.+{{:​transmitter_1.jpg?​direct&​200 |}}The laser transceiver is a free space optical communication device that encodes audio on a laser beam using pulse width modulation (PWM). A single transmitter and receiver unit can be built for about $15-$20 in parts. We used to use this for a demonstration in ELEC 3030 (RF Systems Lab), but aligning the lasers took quite a bit of time to setup.
  
 ====== Design ======= ====== Design =======
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 | LM311 opamp                            | 1        | LM311N ​                  | | LM311 opamp                            | 1        | LM311N ​                  |
 | 741 opamp                              | 1        | LM741CN/​NOPB ​            | | 741 opamp                              | 1        | LM741CN/​NOPB ​            |
-7555 555 timer (CMOS 555 rated to 15V| 1        |                          |+| 555 timer rated to at least 15V        | 1        | NE555N ​                  |
 | prototyping board                      | 2        |                          | | prototyping board                      | 2        |                          |
 | red laser                              | 1        |                          | | red laser                              | 1        |                          |
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 | 9V battery clip                        | 2        |                          | | 9V battery clip                        | 2        |                          |
 | SPST switch ​                           | 2        |                          | | SPST switch ​                           | 2        |                          |
 +
 +===== Other Materials =====
 +You will also need:
 +  * A microphone
 +  * Speakers
 +  * Cables to connect the microphone and speakers
 +  * Two 9V batteries
 +
 +====== Photos ======
 +===== Transmitter =====
 +{{:​transmitter_2.jpg?​direct&​400|}} {{:​transmitter_4.jpg?​direct&​400|}}
 +
 +===== Receiver =====
 +{{:​transmitter_5.jpg?​direct&​400|}} {{:​transmitter_3.jpg?​direct&​400|}}
 +====== Experiments/​Demonstrations ======
 +  * Place a fan in between the transmitter and receiver, breaking the laser. The fan will generate a tone as it spins.
 +  * Use the receiver to listen to light and see if anything else generates sound. Fluorescent lights should.
 +  * Shake power or dust through the laser, or transmit through a stream of water. It should interrupt the audio.
laser_transceiver.1415735033.txt.gz · Last modified: 2014/11/11 13:43 by cwh0009