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Laser Communication System
 

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    LASER COMMUNICATION SYSTEM

    DILEEP CHACKO


    This laser communication system transmits sound or music signals through a laser beam. The intensity of the laser beam changes with the amplitude of the sound signal. The variation in the intensity of the laser beam is converted into a variation in the voltage level by using a calculator's solar panel. The voltage variation on the solar panel is amplified by a low-voltage audio power amplifier LM386 and reproduced by a speaker. The maximum output of audio amplifier LM386 is 1 watt, while its voltage gain is 20 to 200.

    he circuit consists of a transmitter and a receiver. Both the transmitter and the receiver are built around IC LM386, powered by a 9V battery.

    Fig. 1 shows the transmitter circuit. Here a laser diode (LD1) with maximum operating voltage of around 2.6V DC and maximum operating current of 45 mA is used to transmit the audio signal. The voltage divider network formed by R2, R3 and VR3 keeps the voltage as well as the current for the laser diode in the safe region.




    Fig. 1: Transmitter circuit

    In place of the laser diode, you can also use a laser pointer. Remove the battery from the laser pointer. Extend two wires from terminals of LD1 and connect them to the battery terminals of laser pointer. The spring inside the laser pointer is the negative terminal. The output power of the laser pointer is 5 mW. Take care while working with laser, as direct exposure to the laser beam can be hazardous to your eyes. Point the laser beam to the solar panel.

    Potmeter VR1 (10-kilo-ohm) is used to change the level of the input audio signal. The audio input (Vin) is taken from the preamplifier output of the music system (CD player, DVD player, etc). Capacitor C2 and preset VR2 are used to vary the gain of the LM386.

    Fig. 2 shows the receiver circuit. The audio signal transmitted by the laser diode (LD1) is received by the calculator's solar panel and amplified by IC2. The gain of the amplifier is fixed by capacitor C7. Preset VR4 is used to change the signal level from the solar panel. This signal is fed to input pin 3 of IC2 through coupling capacitor C5 so that the DC value from the solar panel can be eliminated. The amplified output from IC2 is fed to the speaker, which plays the music from the CD player connected at the input (Vin) of IC1.



    Fig. 2: Receiver circuit

    Assemble the transmitter and receiver circuits on separate PCBs and enclose in suitable cabinets. In the transmitter cabinet, fix two terminals for connecting the audio signal. Fix switch S1 on the front panel and the laser diode (LD1 or laser pointer) to the rear side of the cabinet. Keep the 9V battery inside the cabinet.

    In the receiver cabinet, fix the calculator's solar panel to the rear side such that the transmitted beam directly falls on it. Fix switch S2 on the front panel and the speaker to the rear side. Keep the 9V battery inside the cabinet. Refer Figs 3 and 4 for the laser pointer and calculator's solar panel.

    After assembling both the circuits, orient the laser diode (or laser pointer) such that the transmitted laser beam directly falls on the solar panel. Use shielded wires for connecting to audio input and solar panel to reduce noise pickup.




    Fig. 3: Laser pointer





    Fig. 3: Solar  Panel


     

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    Post Comment | 78 Comments



    Muthu   940 days ago

    Is this project working
    Reply   2 Replies
    rishi alen   824 days ago

    yeah dis project absltly workng...
    Reply  
    yes it is working   896 days ago

    842xto
    Reply  
    ali   932 days ago

    how to transmit stereo sound
    Reply   2 Replies
    Muthu   927 days ago

    Hi ali..can u jus help me regarding dis projectmy laser diode and circuit works separately but wen i connect them together my laser diode does not work..so how to rectify this problem
    Reply   2 Replies
    GAURAV MISHRA   913 days ago

    had u tried a heat sink coz these types of ckts faces a large amount of charges at terminals.and also you have to take care of the values of votagecurrent.
    Reply  
    rishi alen   824 days ago

    firstly u gave the power supply on both the ckt separately......thn ur project work properly..
    Reply  
    aman   618 days ago

    hii i had prepared the circuit and my laser pointer glows with very low light and i m giving its input with help of mobile. i cant be able to see my laser dimmig low and litting up brighter nd its not workingkindly help
    Reply  
    Spongesha   926 days ago

    would like to do this but with my own image paelse tell me how...many thanks for all the great tutes on here
    Reply  
    tamanna sheikh   910 days ago

    i wanna make dis project... is this best or not ???
    Reply  
    sreelekha   905 days ago

    what are the applications of this circuit??
    Reply   1 Reply
    rishi alen   824 days ago

    there are many application of dis ckt..airport runwaysetelite
    Reply  
    hari   898 days ago

    had to replace the solar panel with A LDR.Now its working.
    Reply   1 Reply
    apoorva   749 days ago

    was thinking about the same thing... thanx a load dude... will use a ldr if any other modifications then pls tell...
    Reply  
    AMITA   880 days ago

    what other source we can connect to the input instead of CD player?
    Reply  
    Mohaned   860 days ago

    Hi Nice to meet u I want do this circuit but i didnt find the IC
    Reply  
    mudit aggarwal   855 days ago

    ive made the ckt.the op voltage is available at the ic pins but the vtg across the laser is 0 pls help asap
    Reply  
    akshata   814 days ago

    hey i have made this project as my mini project my transmitter and receiver both r wrkng properly but whn i connect diode and try to transmitte the signal thn there is lot of distortion and no output could any 1 help me plzzzzzz
    Reply   1 Reply
    swati devlal   103 days ago

    U can use capacitance and resistance at the output to reduce noise or distortions
    Reply  
    akshata kamble   813 days ago

    hey i have taken this as my mini project my transmitter and receiver are working separately but whn i connect diode thn i dont get any output plzzzzzz can any1 help me
    Reply  
    Prashant pal   811 days ago

    does the circuit works if laser pointer is being replaced by an LED??????
    Reply   1 Reply
    sreejith mohan   781 days ago

    yah why not?
    Reply   1 Reply
    apoorva   749 days ago

    but the range covered will be low.
    Reply   1 Reply
    Naitik   709 days ago

    coverage low
    Reply  
    ARPAN   794 days ago

    I made the project its working. But can anyone please let me know the proper working of the circuit that could be explained
    Reply   2 Replies
    axyz   693 days ago

    how do we connect the songmusic to the input terminals?? how many wires ahould be connected.?
    Reply  
    priyadharshini   680 days ago

    The analog signal given is converted to electrical signal and also amplified using the audio amplifier ic lm386 or lm380 this electrical signal or voltage is used by the laser pointer or the LDR to produce laser output in the transmitter sidelaser light transmitted varies in intensity with the amplitude or sound of the analog signalthe signal is received and it is then again amplified in the receiver side and it is again electrical signal is converted to analog signal
    Reply  
    SUBUDH KUMAR   778 days ago

    What is the working range of this circuit?
    Reply  
    sarathkumar   753 days ago

    awesome circuit.i got first prize too in my coll level
    Reply   3 Replies
    karthik   564 days ago

    please send me notes regarding this stuff
    Reply  
    adil   350 days ago

    Can u please send me layout of this circuit....it will be your most kindness
    Reply  
    Efy Admin   744 days ago

    Thanks for the feedback!
    Reply   1 Reply
    arun   539 days ago

    halloooo we implemented the circuit but output is full of noise.....pls help me to rectify this problem
    Reply   1 Reply
    prashand   502 days ago

    u have to use match filter to remove noise
    Reply  
    varun   753 days ago

    hi.i have done this project as my mini project but im getting alot of noise at the reciever side.... can u tell me how to avoid that...
    Reply  
    amol   748 days ago

    is dis analog or digital project???
    Reply  
    pavan   692 days ago

    what is the laser bandwidth
    Reply  
    Ramkumar   683 days ago

    how should i give input at the terminal V1..?can i use a 3.5mm female port and transmit sound signal using a mobile..?
    Reply   1 Reply
    Efy Admin   666 days ago

    You can use any audio jack alongwith audio source such as mobile phone, MP3 player, iPod, etc. Connect two wires to audio jack. Insert the jack into headphone out of your mobile. On the other. Connect the wires to this circuit. One wire connected to Vin and the other to ground rail. Now you can transmit the audio from your mobile.
    Reply   1 Reply
    adil   349 days ago

    sir plz can you send me loyout of this project.it will be your most kindness
    Reply  
    satti   675 days ago

    Hi am working on this project to as mini project but without transmitting part just by heating the laser on the window then can carry the voice behind the window so all i need the receiving part so plez this on gonna work if i didnt change any component ?
    Reply  
    Abhijith V Nampoothiri   655 days ago

    ThankzzzzThis is workingI got first in electronic competition in hss level
    Reply   1 Reply
    Efy Admin   646 days ago

    Congrats! Thanks for the feedback
    Reply   1 Reply
    aman   618 days ago

    sir all works properly need asistance that my laser pointer dosnt dims and glows up when i connect the mobile music to the input through 3.5 mm jack .. pls need imidiate assistance
    Reply  
    aman   621 days ago

    i connected the sircuit with opposite polaar coonection may say ve with -ve of supply and -ve to the ve of supplly ....which componentts shuld be damaged pls help ??
    Reply  
    Jithin   619 days ago

    wow its a cool one.. i am agoing to do this.. sir will this work with a microphone?? what to do if i wanna connect a microphone??
    Reply  
    Pratheug K P   618 days ago

    can u tell me the advantages of laser communication system over other communication systems......?
    Reply  
    MINU MARIAM MATHEW   618 days ago

    in which areas we can implement this circuit.....? can u tell me the advantages of this circuit.....?
    Reply  
    ramesh   617 days ago

    i got output
    Reply  
    MINU MARIAM MATHEW   602 days ago

    Need to know more details.. What r its advantages..
    Reply  
    Jithin   600 days ago

    its working.. perfect... nice work....how can i modify this circuit for me to connect a mic??
    Reply  
    karan shah   590 days ago

    if i want to transmit sound by using my mobile and the 3.5mm audio cable is it possible??and how ??plz explain
    Reply  
    ahmed   588 days ago

    how to connect mobile phone to vin
    Reply  
    arunjosephyahoo.com   539 days ago

    output full of noise how to solve this problem somebody pls help........
    Reply  
    raj   539 days ago

    this data is not sufficient. can anyone send me full report if completd this project.
    Reply  
    raj   539 days ago

    data is not sufficient. can anyone send me full report if completed this project.
    Reply  
    dinesh   528 days ago

    can i use photodiode in place of solarcel
    Reply  
    sreehari   527 days ago

    data is not sufficient.please give me the full report of the project and circuit design....
    Reply  
    akshay   526 days ago

    its working...but can u explain its applications ....? please
    Reply   1 Reply
    rishi alen   448 days ago

    application in radar comm and defance also
    Reply  
    pravin   515 days ago

    my project is working the problm is d sound reproduced on speaker is very low i try to set all pots and pesets bt still no effect do help me plz my peresentation is on cuming tuesday plz help us bec even though d project is working they will dismiss us plz
    Reply   1 Reply
    pavan reddy   446 days ago

    use an audio amplifer ckt available in multi input audio amplifer ckt in efu project.. use it.. u get good results
    Reply  
    Muhammad Yasir   447 days ago

    what if i use photo diode rather than solar panel?? will it run properly???kindly reply becx i have designated this
    Reply  
    amulya   405 days ago

    how to transmit sound
    Reply  
    mridula   405 days ago

    its working properly nd hav many app. nd advantages
    Reply   1 Reply
    rishad   371 days ago

    yesssss i completed this project today and it is working good
    Reply   2 Replies
    Efy Admin   371 days ago

    congrats!
    Reply   2 Replies
    sreeja   19 days ago

    hi what is the rating of calclators solar panel?nd what is cost of it?
    Reply  
    sreeja   21 days ago

    what is the rating of caluclators solar panel?how much of cost it is..?
    Reply  
    chaitanya   177 days ago

    can you give me the pcb layout of this transmitter and receiver circuit because i will making this project for our major project. you can give me this circuit details on my email id chaitware@gmail.com please its very urgentally
    Reply  
    varaj   365 days ago

    in the reciever circuit i use auio output transformer but its not working please help
    Reply  
    satydeep   205 days ago

    sir can you give me the pcb layout of this transmitter and receiver circuit because i will making this project for our major project. you can give me this circuit details on my email id satydeep143@gmail.com.please sir its urgentally
    Reply  
    SURESH.G   174 days ago

    hi i have made this project as my major project. my major project having single transmitter and multiple no of receiver ckts using single laser diode the receiver can receive the optical signal in any point in 360 degreeits mainly used in home theaters and long distance public addressing system if any doubt mailed in my mail id etronicsngl@yahoo.com
    Reply   1 Reply
    Darshan   168 days ago

    Sir please send me the pcb layout both transmitter and reciever my mail id is darforsmiley04@gmail.com
    Reply   1 Reply
    SURESH.G   166 days ago

    ok wait twodays
    Reply   1 Reply
    rommel   99 days ago

    broda send me also
    Reply  
    rahul   139 days ago

    i need a project report...plz send me on my mail ID
    Reply  
    sreeja   21 days ago

    hiii.....please tell me the rating of caluclators solar panel? and how much cost it is...?
    Reply  

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