166 Comments

  1. October 22, 2011 at 2:08 am

    ampher

    its a very good post

    Reply
  2. November 29, 2011 at 7:03 am

    Imran

    I copy this. Thanks

    Reply
  3. March 30, 2012 at 11:04 am

    Pritesh

    i cant found VC1 which is available in schematic diagram but not in BREADBOARD….and i also can’t see a ANTENNA clearly…

    Reply
    1. March 30, 2012 at 11:54 am

      Sagar

      Hi, I used 20pF(right below the inductor) in place of variable capacitor. Please use any ceramic capacitor between 1-100pF. For antenna(the green wire standing erect), you can use 5-10cm normal copper wire. best of luck.

      Reply
  4. May 28, 2012 at 7:54 am

    vamsi

    can u please tell me what is the frequency i sould tune in my receiver…..?
    i made nearly three circuits…nd came to ur circuit…which is using 2n 3904..
    can i replace bc 547 in that place(Q1)…? plz reply i am preparing my self for mini project..

    Reply
    1. May 28, 2012 at 9:28 am

      Sagar

      You can use 2N3904 or BC547. Your frequency depends upon the inductor you have used or made. And on that page, you can see the formula of frequency. Please calculate it yourself. You can still try all the FM bands. The formula is http://www.buildcircuit.com/wp-content/uploads/2011/01/equationB.jpg
      You can get this formula on the same tutorial page.

      Reply
      1. May 28, 2012 at 10:46 am

        vamsi

        thanks for replying…ur really a great helper..bcoz in other blogs i can find simply many ckts but no reply..about trouble shooting…
        sorry for other question…whats the range of this transmitter…?
        actually i constructed the ckt in three different circuits available in internet..but all of them failed..
        in receiver i can hear ..popping sound when i made to hit the mic with screw driver..but voice is not transmitting
        is there any tips for troubleshoot…any suggestions for ckt…

        Reply
        1. May 28, 2012 at 11:31 am

          Sagar

          the range of the transmitter depends upon the length of the antenna. In your case, it should be around 10cm only.
          Troubleshooting:
          a. Did you scrap the ends of inductor? if you don’t scrap, it doesn’t work.
          b. Keep wires of microphone short. If they are long, that introduces extra inductance and the frequency changes. Therefore, keep it short.
          c. Follow the instructions given on the page carefully.
          d. change the value of VC1- variable capacitor, you may keep 20pF, 22pF, 33pF, keep on trying…
          e. In place of R1- 470, try with 330 Ohm resistor also.
          f. In place of C2- 4.7pF, insert 100pF, or 20pF or some other nearest value capacitor. but it should be in pF only.
          g. Check this video: how to make inductor: http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw
          h. Check this video: how to connect electret mircophone: http://www.buildcircuit.com/how-to-use-electret-microphone/

          Remember that this kind of radio projects don’t work in the first attempt, you have to make several hit and trails, best of luck.

          Reply
          1. May 28, 2012 at 11:54 am

            vamsi

            ok..thanks for troubleshooting tips….any way i am using readily available inductor…
            i am going to college and use ur trouble shoot tips and post the result after that testing….

          2. May 29, 2012 at 9:00 pm

            vamsi

            i have doubt about antenna..to use whether 15cm or 10metres..i am in middle of my mini project..

          3. May 29, 2012 at 9:54 pm

            Sagar

            I am sorry, my mistake, it is 10cm. Not 10m, it is obvious that 10meters is too long for such a small transmitter. Did you make the length of electret microphone very short? It should be short. And do you have an extra electret microphone? sometimes, while soldering, the microphone breaks down. So, always keep extra components. I will try to make the circuit again today (just for you) and let you know if there is any problem.

          4. May 29, 2012 at 10:09 pm

            vamsi

            sir ..plz how to use trimmer capacitor…..VC1 ….it is having three terminals….by the way i am also connecting right now…is it possible to contact u in another way..bcoz its taking long time ..to contact u sir plz…

      2. July 22, 2019 at 6:11 pm

        sai ashwin

        hi bro I want to know that at how much frequency you got the output?? please tell me fast as I am in middle of my project

        Reply
  5. May 29, 2012 at 7:13 pm

    vamsi

    sir …i tried on my bread board..i made changes as u said sir..it worked..but only i can hear popping sound…in ur previous reply u said that antenna height is 10metres…!. but u have used 15 cm only that to copper wire…i have used whip antenna like the antenna used in pocket fm radios…plz reply sir i am waiting …

    Reply
  6. June 12, 2012 at 4:29 am

    Jhon

    Hey I like the circuit and am wondering if I could integrate it with my own project. I would like to control a servo for my home made RC car. If I were to put a potentiometer in place of the mic would the signal that I receive allow me to control the speed of a motor or a servo.

    Thanks

    Reply
  7. June 20, 2012 at 12:23 pm

    omprakash

    i am doing fm transmitter.
    the transmitted output can be seen by mobile fm receiver.but i am not gettin the exact voice .
    please tell me the exact freaquncy.

    Reply
  8. June 20, 2012 at 1:05 pm

    omprakash

    can you tell me the exact range of transmition.
    how far can plase the reasever.
    can i use cell phone as receiver.

    Reply
    1. July 15, 2013 at 9:37 am

      Abhi

      Ya u can use by tuning to proper frequency.

      Reply
  9. July 4, 2012 at 5:31 am

    Kaguai George

    Hello,
    Great job,i have personally implemented its working propely. How can the range of frequencies be extended to say over 10meters or so,using the same circuit design with little modifications?
    Regards.

    Kaguai George.

    Reply
  10. July 4, 2012 at 5:33 am

    Kaguai George

    Hello,
    Great job,i have personally implemented its working propely. How can the range of frequencies be extended to say over 10meters or so,using the same circuit design with little modifications?
    Regards.

    Kaguai K George.

    Reply
  11. July 5, 2012 at 5:50 pm

    anurag

    which wire can be used as an antenna…..how much long it should be?

    Reply
    1. July 5, 2012 at 6:16 pm

      Sagar

      use a normal copper wire, that you are using as connector on breadboard. It should be 10-15cm long.

      Reply
  12. July 5, 2012 at 5:53 pm

    anurag

    can a wire serves as an antenna in fm transmitter…..if yes., which wire should be should be used as an antenna and how much long it should be?

    Reply
    1. July 5, 2012 at 6:16 pm

      Sagar

      use a normal copper wire, that you use as connector on breadboard. It should be 10-15cm long.

      Reply
  13. July 8, 2012 at 7:58 am

    manan

    i want to make a project whih transfer electriity using wirless antenna…not using coil…..is this possible…

    Reply
    1. July 9, 2012 at 10:50 am

      Sagar

      Not possible.

      Reply
    2. August 1, 2012 at 3:21 am

      Gabrielstone

      it is possible.cos i’ve seen it before on some invention site. what you are talking of is *airnergy* just google it up and confirm for yourself

      Reply
    3. February 24, 2013 at 8:19 pm

      raj kumar

      inductance L1-RADIUS HOW MUCHE

      Reply
      1. February 25, 2013 at 10:39 am

        Sagar Sapkota

        there is a video on this page. just check that.

        Reply
  14. July 9, 2012 at 5:12 pm

    anurag

    hi …friend i am confused with the trimmer capacitor , it has 3 terminals how to connect it in the circuit

    Reply
  15. July 9, 2012 at 5:19 pm

    anurag

    hi…..friend…….i used 2 transistors bc547, bf494 instead of 2N3904 , but i am confused with the transistor terminals .emitter , base , collector……please say me whether it is ebc , ceb , ceb? For both bc547 , bf497

    Reply
    1. August 15, 2012 at 12:47 am

      jd qureshi

      use multimeter to find the emiter collector base of a transistor …..!!
      sitch the knob on diode symbol

      Reply
  16. July 9, 2012 at 5:50 pm

    Raj

    can you explain how can we check a remote control usind transmitter and receiver i.e.,when a button is pressed on the remote,by seeing at the receiver end ,we should able to say which button is pressed??

    Reply
  17. July 17, 2012 at 12:33 pm

    rajat

    what is L C in fomula of calculating frequency

    Reply
    1. August 29, 2012 at 3:20 am

      mark amielee dela torre

      l mean the value of the inductor while c the value of the capacitor

      Reply
      1. January 24, 2013 at 3:54 pm

        abhishek bhati

        but which one capacitor pls tell me…..is used to calculating freequency in formula……

        Reply
  18. August 4, 2012 at 5:34 pm

    kiran

    sir , please can u tell me what L&C mean in the formula for frequency please sir….

    Reply
    1. October 2, 2012 at 12:35 pm

      Akshay

      L in Inductance
      C is Capacitance

      f is frequency of circuit.

      f=1/2Pi Underroot(L x C)

      Reply
  19. August 6, 2012 at 8:24 am

    Shivam

    I m nt gettin the 22nf capacitor. Wht can i us instead of that??? And i have got 0.001uf capacitor of code 103 instead of 102. Will it work??????

    Reply
  20. August 6, 2012 at 3:31 pm

    Shivam

    Hey m not gettin the 22nf capacitor. Wat else can i use instead of that???? Plz. Reply…..

    Reply
  21. August 10, 2012 at 7:40 pm

    hart

    sir, i cant find 4.7pF can I use 5pF instead?

    Reply
  22. September 6, 2012 at 10:04 pm

    bright

    sir, you are doing a nice job her but i have a problem. my transmitter works only when my hand is ontop vc1. pls i need help. thanks

    Reply
  23. September 13, 2012 at 4:44 pm

    amir

    at which frequeny i can recive my transmitted signal

    Reply
  24. September 29, 2012 at 7:24 pm

    shashank

    how to find frequency using the given formula

    Reply
  25. October 2, 2012 at 12:16 pm

    Akshay

    Please reply ! πŸ™ need help …

    What can i use instead of a Variable capacitor ?
    i cant find one …. also what if i use 0.1 H Inductor instead of Copper coil. i cant find the said wire as well ! :(((

    Reply
    1. October 2, 2012 at 12:28 pm

      Sagar Sapkota

      You need to have a variable capacitor to change the frequency. It will be very difficult for you otherwise to make the circuit work. And, I think 0.1H does not work. You need to have 0.1uH. see the video about how to make coil. It’s on this page.

      Reply
      1. October 3, 2012 at 12:05 pm

        Akshay

        But you yourself have used a 20pF Cap. then why need for a variable one ?

        and i will use 0.1uH instead of coil and 20pF instead of variable … will it work ? :O πŸ™‚

        Reply
        1. October 3, 2012 at 5:52 pm

          Sagar Sapkota

          Yes, if you use fixed capacitor, then also it should work. But as a novice, I recommend you to use variable capacitor.

          Reply
    2. October 24, 2012 at 6:03 pm

      benhar t.j

      i hav’nt get trimmer capacitor. what can i do?

      Reply
      1. October 25, 2012 at 8:53 am

        Sagar Sapkota

        Then use a normal fixed ceramic capacitor between 20pF to 100pF.

        Reply
    3. July 28, 2013 at 6:31 pm

      Abhi

      Use c=20uf fix value or take out tunner frm old radio. Take simple relay switch & break it u’ll get coil.

      Reply
  26. October 13, 2012 at 11:28 pm

    Radu

    I tried with microphone. I tried with jack wire. i didn’t find 4.7 pF and used 20 pf. I have something that has writen on it u4.7 not 4.7u is the same ting no ?
    I used 1.2 uF it may be the problem?
    I tried reciving fm sound with phone and radio. Didn’t work I tried every frequency.
    Even I tried to calculate the frequency but I don’t know the exact valu of L …
    Maybe you can tell me in what range of values (80-90 90-100) the correct frequency may be.
    Thx in advice.

    Reply
  27. November 1, 2012 at 7:14 am

    chaitanya

    sir……….i couldn’t find 0.1uh inductor nor 26swg wire in my city instead 1uh is available.will the circuit still work if i use 1uh…………reply ASAP

    Reply
    1. November 1, 2012 at 9:41 am

      Sagar Sapkota

      No, 1uH does not work. You can use wire from 21SW to 30SWG. See here how to make the inductor: http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw
      Now, you should do hit and trial. It may work. Make three inductors with 5 turns, 6 turns and 7 turns and try with those three. I hope it helps.

      Reply
  28. November 22, 2012 at 8:26 pm

    rezwan

    i like that project here, bt this circuit has no carrier frequency circuit so how long it can be transmitted??

    Reply
    1. December 15, 2012 at 11:54 am

      DAHB

      the LC is the oscillator its self, a.k.a. tank circuit, it operates on a resonance frequency given by the formula. btw, i would suggest getting a frequency counter from ebay, its pretty cheap. so you can tune your fm receiver at that frequency, and you dont have to get a variable cap for that.

      or you could just vary the length of your inductor to tune your transmitter.
      looking at this formula:

      L = [(d^2)(n^2)] / [18d + 40l]

      L – in uH (inductor)
      d – in inches (coil diameter)
      l – coil length in inches
      n – number of turns

      ive been building transmitter for about 10years now. fm/pm/am/fsk/psk/etc.

      Reply
  29. November 26, 2012 at 5:50 am

    Monika

    Hello Sir,

    Could you please explain in little detail the working of this circuit? Kindly reply!!

    Reply
  30. December 3, 2012 at 6:48 pm

    mahmoud

    Excuse me, at what frequency range does this circuit transmit?
    I hope you will replay.

    Reply
    1. December 27, 2012 at 12:16 pm

      Sagar Sapkota

      should be 10meters.

      Reply
      1. December 31, 2012 at 5:45 pm

        abdulbasit

        frequency range??? in meters how is it possible

        Reply
  31. December 9, 2012 at 3:32 pm

    goldriver

    I am having simulating this circuit on multisim. Can someone please help?

    Reply
  32. December 13, 2012 at 8:50 am

    DAVIES

    i made one but i dont know the range how long does it transimt?

    Reply
  33. December 18, 2012 at 9:03 am

    Saud

    Sir, i would like to try to do this circuit
    my doubt is how to test the signal ?? by using oscilloscope

    please repay

    best regards

    Reply
  34. December 19, 2012 at 10:59 am

    Safiu Abiodun Adams

    Sir, dis is my first time of entring this site, so where can i get the component in order to practise the experiment.

    Reply
    1. December 27, 2012 at 12:11 pm

      Sagar Sapkota

      You should get the components in local electronics store.

      Reply
  35. December 30, 2012 at 6:55 am

    JAKE

    Sir Good Day.. Can I ask how far this transmitter can transmit signal??how many meters?If i wanted to extend its range of transmission, what should I adjust or what should i change?

    This is my first time here..Please reply sir..Thank You!!

    Reply
  36. January 12, 2013 at 9:41 pm

    sudaco

    I probe this and this is a lot of noise , so I think we need a farady jail

    Reply
  37. January 14, 2013 at 4:12 am

    vicky

    what is range covered by transmitter antenna.

    Reply
    1. January 15, 2013 at 7:06 pm

      Sagar Sapkota

      10 meters

      Reply
  38. January 24, 2013 at 3:58 pm

    abhishek bhati

    sir pls tell which capacitor value will be used in calculating the freequency in formula…………….

    Reply
  39. January 24, 2013 at 3:59 pm

    abhishek bhati

    sir pls tell me which capacitor value will be used in formula………………..

    Reply
  40. January 29, 2013 at 10:57 am

    Shashank

    Sir, I want to send music as my modulated signal. I am actually doing this for the first time. Can I use a female 3.5mm jack and connect it to an audio source? Please help me…

    Reply
  41. January 29, 2013 at 12:59 pm

    prakhar

    i dont find 2n3904 what another transister should i use in this place

    Reply
  42. January 31, 2013 at 12:39 pm

    Noman Abbasi Sukkur

    Hello ,
    Dear Sagar Really You Are Nice Man and Helper :
    Very Good Job :
    Thankssss πŸ™‚

    Reply
  43. February 6, 2013 at 12:50 pm

    krishna

    can we give the input of
    3.5mm jack instead of microphone?

    Reply
  44. February 6, 2013 at 5:19 pm

    vignesh

    sir,what receiver can i use? in this there is no receiver circuit..
    the receiver circuit should be tuned to the same frequency know… so can u post the receiver circuit….please….

    Reply
    1. March 9, 2013 at 4:04 pm

      gemu

      sir I used condensor mic will it work
      Are there any values of variable capacitors because the shopkeeper ask me the value

      Reply
      1. March 10, 2013 at 8:43 am

        Sagar Sapkota

        The value of variable capacitor can be between 0-100pf. You can also use 20-100pF capacitor also.

        Reply
  45. February 7, 2013 at 10:51 am

    Shuvojit das

    Very nice and illustrated project. But I’m little unhappy with range 10 meters. Is there any shortcut way to increase it ?

    Reply
  46. February 27, 2013 at 4:04 pm

    isaac

    sir pls tell which capacitor value will be used in calculating the freequency in formula – See more at: http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter/#sthash.lYtj5LPK.dpuf

    Reply
  47. March 5, 2013 at 2:04 pm

    Gurjeet

    sir where you can use trimmer in transmitter circuit

    Reply
  48. March 8, 2013 at 9:15 am

    pankaj

    i want to switch diagram about following : 5 resistance,4 capacitance, capacitor,mic, antena, transmitter, transistor, +v&-v

    Reply
  49. March 11, 2013 at 4:48 pm

    gemu

    can i use a condensor mic

    Reply
    1. March 11, 2013 at 5:03 pm

      Sagar Sapkota

      YES

      Reply
  50. March 15, 2013 at 4:08 pm

    Navnish

    It is good.i’ll make it but whats the range of it?

    Reply
    1. March 15, 2013 at 7:00 pm

      Sagar Sapkota

      about 10 meters only

      Reply
  51. March 17, 2013 at 6:43 am

    gemu

    sir what happens if you increase the amount of coil turns

    Reply
    1. March 17, 2013 at 9:37 am

      Sagar Sapkota

      The inductance will change.

      Reply
      1. April 6, 2013 at 10:52 pm

        Kartik

        Inductance will increase if turns are iincrease or it will decrease if turns are decrease

        Reply
        1. July 28, 2013 at 6:13 pm

          Abhi

          Increases

          Reply
  52. March 18, 2013 at 11:17 am

    Asad

    Sir
    I wand fm transmetter 2km range plez help me gave me full datel what price and were i bay.

    Reply
  53. April 1, 2013 at 4:52 pm

    gemu

    what if you increase the number of coil turns

    Reply
    1. July 28, 2013 at 6:09 pm

      Abhi

      It will vary inductance of coil resulting in frequency change.

      Reply
  54. April 4, 2013 at 10:37 am

    F0X

    Hello, how can I make the same FM circuit but with changeable frequency (transmitter and receiver).

    Reply
  55. April 4, 2013 at 4:49 pm

    Ted

    My school Cleveland Institute of Electronics expands on the FM transmitter plan a little bit. Theirs has a larger range. Here is their posted building plan from one of their instructors: http://cie-wc.edu/freekitplans.aspx

    Reply
  56. April 16, 2013 at 5:16 pm

    holykem

    this circuits building is very simple

    Reply
  57. April 20, 2013 at 8:06 am

    Anish

    whats that arrow before R1

    Reply
  58. April 24, 2013 at 5:31 am

    Toxic

    Hi, I think this would be nice for a personal project but I have a question, Can i use an earphone jack instead of a microphone so that i can transmit the signal from an mp3 player (like an iphone) to the radio? If not, can I still use this design but only changing a few thing in order to make it work with a jack instead of a microphone?

    Reply
    1. June 5, 2013 at 9:11 pm

      Guillermo Villalta

      Yes you can, just connect every line from your earphone jack microphone to the microphone entrance circuit or even you can use your small speaker as a microphone if you prefer. Just remember the circuit is not stereo and you have to join the line A with B from your mp3 player or other device speaker lines you want to use as source of sound with the positive line in the entrance of your circuit.

      Reply
    2. November 8, 2013 at 10:27 am

      fami

      it is nice
      how can get inductor turn
      do you possible if use earphone in please of mic

      Reply
  59. April 26, 2013 at 10:50 am

    ravindra

    how to check these transmitter after completing…

    Reply
  60. April 26, 2013 at 10:53 am

    ravindra

    please sir help me hou check after completing of these fm transmitter

    Reply
    1. May 25, 2013 at 8:41 pm

      bruno

      Just transmit any song in it and turn your reserves frequency until you set the song which u transmit.

      Reply
    2. June 15, 2013 at 4:42 pm

      Jithin vk

      How can increas the efficiancy of the transmitter

      Reply
    3. July 28, 2013 at 5:44 pm

      Abhi

      Switch ΓΆn the transmitter.then in recevier(any radio) tune that till u get reception keep transmitter 10 ft away from recevier

      Reply
  61. May 14, 2013 at 4:47 pm

    Osmond

    How will you make your fm transmitter board.

    Reply
  62. May 22, 2013 at 9:55 am

    munna

    nice really good post by fm transmitter circuit.

    Reply
  63. May 23, 2013 at 6:12 am

    venkatlesh

    it”s really very good job.

    Reply
  64. May 28, 2013 at 9:23 am

    Anoop Jayaram

    Switch on the transmiter , We have to get a reciever to acepts the signel. Give some sound to microphone. Switch on receiver (any fm radio). Now we can her the sound in receiver.

    Reply
  65. June 10, 2013 at 5:18 pm

    rohit

    sir i am very new to this field and i bought a new multimeter dt830d but i am not sure whether it is working so how can i test it. i havve all the above components to make a transmittor

    Reply
  66. June 10, 2013 at 7:31 pm

    uday

    instead of wirewound inductor you made and as shown in description instead of wirewound inductor can i use a fixed 0.1uh inductor will the circuit work. and also tell me any circuit modification to increase the range. or any other circuit.

    Reply
    1. July 15, 2013 at 3:06 pm

      prashanth

      yes u can use 0.1uh inductor in the circuit it wil works

      Reply
  67. June 14, 2013 at 10:14 am

    Bob

    If I replace the microphone with an audio jack would it transmit music from an MP3 player.

    Reply
    1. May 23, 2014 at 11:26 pm

      Aman malik

      yeah it’ll work,..

      Reply
  68. June 19, 2013 at 11:09 am

    Dawa Sherpa

    Sir, bc547 transistor and 2N3904 are same or diffrent?

    Reply
    1. October 1, 2013 at 1:08 pm

      dfdbv

      BOTH ARE SAME

      Reply
  69. July 3, 2013 at 6:25 am

    Midhun babu

    I like

    Reply
  70. July 13, 2013 at 5:41 pm

    www.Webcomtois.fr

    I visited various blogs however the audio feature for audio
    songs current at this web site is actually excellent.

    Reply
  71. July 24, 2013 at 10:56 pm

    Maurice

    How you can calculate its frequency?

    Reply
  72. July 27, 2013 at 8:38 am

    Shaishab Roy

    To calculate the frequency using given formula what is the value of C=?
    Please feedback me.
    Thanks

    Reply
    1. July 28, 2013 at 5:34 pm

      Abhi

      Capacitance of trimmer or fixed capacitance (20uf)

      Reply
  73. July 29, 2013 at 2:25 pm

    kirtan

    which type of inductor can we use?

    Reply
  74. July 29, 2013 at 2:26 pm

    kirtan

    which typoe of inductor can we use?

    Reply
  75. July 29, 2013 at 2:29 pm

    mori

    hello..sir How we make the Inductor ?

    Reply
  76. September 3, 2013 at 2:29 pm

    ashea

    are all capacitors are ceramic? and does the negative side of the battery can be consider as a ground? help plsss thankz great post

    Reply
  77. September 13, 2013 at 11:11 am

    Nameless

    Hi, thanks for the post! But i dont see any variable capacitor in the picture with bread board! is that VC for fun!( i’m kidding! :D)

    Reply
  78. September 14, 2013 at 10:30 pm

    Q factor!

    Hi, this design has some little problems! 1st the resistor for bias mic is to low it should be 47k for 9volt supply.
    C2 must be 10p couse 4.7 is to low and T2 get some problem in turning on. and must important thing is that mic shouldn’t connect directly to base use 22nf capacitor to bipos it.

    Reply
  79. September 20, 2013 at 2:06 pm

    adi

    Sir i made it bt it could not worked ……………

    Reply
  80. September 20, 2013 at 7:50 pm

    vikrant

    amzing its wrking for me

    Reply
  81. October 1, 2013 at 2:52 pm

    Sonali Saini

    Hello Sir,
    Is there any way to create a FM transmitter of “480 kHz”?
    If yes then please help me out.

    Reply
  82. October 3, 2013 at 8:17 pm

    ali nawaz

    really a graet and helpfull post for me thanks

    Reply
  83. October 12, 2013 at 10:10 am

    siva

    it is nice
    how to receive transmitted signal?

    Reply
  84. October 16, 2013 at 6:22 am

    Mithilanand Jha

    sir please i request you answer this that to how to increase the range?

    Reply
  85. October 30, 2013 at 2:25 pm

    wendesen melaku

    I am a Communication Engineering student from Ethiopia. Your project seems smart. but what if I want the capacity to be raised to 1000m?

    Reply
    1. February 3, 2014 at 4:12 pm

      Benz Narankz

      Hey Melaku, i think you first need a powerful battery plus you need to adjust the length of the antenna and look for a transistor with great amplification factor.

      ain’t sure coz am a computer eng. student too but hope that the best i can say.

      Reply
  86. November 3, 2013 at 8:12 am

    ralf loren angeles

    hi, do you have any FM transmitter with 10W of power., i would like to know if know how to build? this is may contance number +639266730147

    Reply
    1. December 17, 2013 at 5:46 am

      zulqarnain haider

      yea i have a transmitter if 10 w of power which was design by us in our final year project in our college

      Reply
  87. November 8, 2013 at 10:18 am

    fami

    it is nice
    how you can find inductor turn
    please give instruction.&
    do you possible if you can use earphone ins ted of mic

    Reply
  88. November 26, 2013 at 9:46 am

    marzuliani

    hi. can i know what should be modified if i want the transmitter to transmit for about 8000 square feet. thanxs

    Reply
    1. March 20, 2014 at 12:13 am

      darthvader

      #haw i Ned to know hawwww ******** **
      O

      Reply
  89. December 21, 2013 at 12:21 pm

    Maneesh Kumar

    is there any replacement for 22nf capacitor. can i use a 22 SWG enamel wire for making inductor???

    Reply
  90. January 3, 2014 at 2:29 pm

    Savavieta.Lv

    Greetings I am so glad I found your weblog,
    I really found you by mistake, while I was browsing on Digg for something else, Nonetheless I am here now and would just like to say cheers for a tremendous
    post and a all round thrilling blog (I also love the theme/design), I don’t have time to read it all at the moment but I have bookmarked it and also added in your RSS feeds, so when
    I have time I will be back to read much more, Please do keep up
    the superb jo.

    Reply
  91. February 7, 2014 at 7:31 am

    ashish verma

    i m too much benifited by this video

    Reply
  92. March 20, 2014 at 12:07 am

    darthvader

    not to bad . πŸ™‚

    Reply
  93. March 20, 2014 at 12:10 am

    darthvader

    :W #$can you make it simpler$#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    πŸ™ i no have rite parts please send reply !!!!!!!!!!! need help emale darthvaderthe1@hotmail.com

    Reply
  94. April 12, 2014 at 11:02 pm

    Motaz

    i have .22uh inductor will it work??

    Reply
  95. April 16, 2014 at 10:47 pm

    Mark C

    So my group and I decided to try to modify this project a little, by replacing the microphone with a male headphone jack, we didn’t have a new one but I used one from an old pair of headphones. It didn’t seem to be working, but when we set it near the radio we were using as a test, after removing the jack because we were not getting a signal, we began to pick up other radio signals while varying the 0-100 uF capacitor. Does anyone have an idea of why it is doing this?

    Reply
  96. July 16, 2014 at 11:47 am

    Nagaraju

    I saw your circuit diagram, Your explanation is very nice, Thanks you very much. I want to make a

    Reply
  97. July 16, 2014 at 11:52 am

    Nagaraju

    Thanks for brief explanation.

    Reply
  98. August 21, 2014 at 6:30 pm

    bharath

    Can u explain the circuit operation

    Reply
  99. September 30, 2014 at 10:58 am

    MD MOTINUR RAHMAN

    THIS IS VERY NICE, ANY-MAN CAN RELY ON IT

    Reply
  100. October 11, 2014 at 11:35 am

    Hasnain

    Thanks man,, is there any way of making a good antena,bcoz without antena my transmitter was giving 10 meters range,,with antena range was increasing but causing noise

    Reply
  101. October 17, 2014 at 2:57 am

    Miracel

    worked for me. πŸ™‚ such a friendly tutorial. thanks!!

    Reply
  102. October 24, 2014 at 6:09 am

    Amdani Wijaya

    From the formula above, if I use capacitor 20pF and inductor 0.1Β΅H, that mean I will get frequency 112.60 MHZ, is right? Thanks.

    Reply
  103. October 27, 2014 at 9:07 am

    Shihab vkm

    tnx itis very good … my first attempt success … tnx

    Reply
  104. November 19, 2014 at 10:14 am

    yogesh

    thank you sir !! given circuit work properly !!

    Reply
  105. February 27, 2015 at 8:39 am

    mohammed hameed

    Great job Thank you
    (102) code refer to 0.1uF not to 0.001uF

    Reply
    1. March 26, 2015 at 10:43 pm

      mnasim31

      Hi hameed bhai, can you recheck your ceramic data table. I think you are doing some mistake

      Reply
  106. February 28, 2015 at 6:55 am

    sahib khan

    sir how can finde the value of inductor and capacitor? it is possibl through multimeter?

    Reply
  107. February 28, 2015 at 8:43 am

    sahib khan

    how can finds the value of inductor through multimeter?

    Reply
  108. June 14, 2015 at 12:04 pm

    Tuner

    Wow, FM Transmitter :D, great..
    is it work well.., with that thing?
    if can’t sound maybe on calibrating freq, tuning transistor to 88-108Mhz RF
    the inductance is ok, nothing usefull with that, need 3mm long to create tuning form.

    Result, Not Work.. πŸ˜€ haha

    Reply
  109. June 21, 2015 at 3:56 am

    pkd

    hi , i am unable to found 2n1904 can i use any other transistor?

    Reply
  110. August 10, 2015 at 6:17 pm

    jacky

    hello how do connect bettery – and + ?plz help

    Reply
  111. July 15, 2016 at 5:49 am

    Jayendra Mandradiar

    I have a question about the formula.
    I know L is inductance, but I want to to which capacitor value to use for C.
    I am not able to find the frequency.

    Reply
  112. August 25, 2016 at 12:54 pm

    Josef Danielsson

    Is the 20pf capacitor necessary?

    Reply
  113. September 8, 2016 at 1:06 pm

    Giri

    How can I mix music or my voice through the transmitter.

    Reply

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