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Making an FM Transmitter

Discussion in 'General Electronics Discussion' started by vick5821, Nov 29, 2013.

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  1. vick5821

    vick5821

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    Jan 22, 2012
    Hey there ! Recently I am working on a simple mini project which ia making a FM transmitter.

    I get my reference from this website : http://www.minibread.com/modules/blockblog/blockblog-post.php?post_id=5

    However, according to the schematic, I am not able to get S9018 transistor and 5.5T inductor. What other transistor can replaced that ? Can I use a 6.8micro inductor instead ?

    Thanks for the opinion and help !


    Greetings,
    Vincent
     
  2. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Hi Vincent,

    You can use a BC547 or a 2N2222 or similar for the transistor.
    For the inductor 6.8µH will be to high, the BOM state 0.1µH, you can easily made the inductor yourself with a piece of rigid electrical wire of around 1mm of diameter

    Olivier
     
  3. vick5821

    vick5821

    700
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    Jan 22, 2012
    What is the reasonable range for the inductor ? possible for me to parallel a few 6.8uH inductor ?

    Thanks !
     
  4. OLIVE2222

    OLIVE2222

    690
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    Oct 2, 2011
  5. vick5821

    vick5821

    700
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    Jan 22, 2012
    Rigid wire ? I dont have any for now. I only have single core connecting wires only. Is that possible ?

    Thanks !
     
  6. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
  7. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    PS as the wire is unvarnished stretch the inductor a bit
     
  8. vick5821

    vick5821

    700
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    Jan 22, 2012
    So, I can actually used a single cored wire with the insulator coated to make one inductor ?

    Thanks !
     
  9. OLIVE2222

    OLIVE2222

    690
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    Oct 2, 2011
  10. vick5821

    vick5821

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    Jan 22, 2012
  11. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
    You're not going to be supporting a high rise with it. :rolleyes: Trench soldiers worked with much less. ;)

    Chris
     
  12. vick5821

    vick5821

    700
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    Jan 22, 2012
    Is it possible for me to use 2N3904 NPN transistor ? Thanks !
     
  13. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Yes you can use a 2N3904
     
  14. vick5821

    vick5821

    700
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    Jan 22, 2012
  15. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
  16. vick5821

    vick5821

    700
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    Jan 22, 2012
    Is that possible for me to measure the output frequency of my circuit ?

    Thanks !
     
  17. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    The odds are that you don't posses a frequency counter, grid or gate dip meter or a scope capable of measuring this. This leaves you with what you have, which is the FM receiver itself.

    Chris
     
  18. vick5821

    vick5821

    700
    0
    Jan 22, 2012
    I made a FM transmitter and the receiver able to receive it. But not stable. Any ways to make it stable and longer range ?

    Thanks!
     
  19. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Well this is a very basic circuit, for best stability use a NPO type capacitor for C4 and build the circuit above a ground plane are probably the only possible improvement. For better stability you need a crystal or a PLL.

    For longer range you can locate the transmitter in a higher position and/or use a good antenna.

    Olivier
     
  20. vick5821

    vick5821

    700
    0
    Jan 22, 2012
    I am building this circuit,

    Thanks! :D
     

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