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Is transistor faulty or something else amiss

Discussion in 'Radio and Wireless' started by Devnode, Aug 5, 2019.

  1. Audioguru

    Audioguru

    2,549
    574
    Sep 24, 2016
    A simple FM transmitter sounds awful without producing low and high audio frequencies. Also its radio frequency wanders all over the place.

    My FM transmitter uses the oscillator trimmer capacitor to select a vacant radio frequency and the trimmer capacitor on the RF amplifier is broadly peaked for maximum output power. My coils made with thick enamelled wire are like this:
     

    Attached Files:

  2. Devnode

    Devnode

    92
    4
    Jul 13, 2015
    I will definitely try it out. The more i practice, the more knowledge i gain. I think. Thank You so much.
    aureIZ.
     
  3. Devnode

    Devnode

    92
    4
    Jul 13, 2015
    Thank you so much. Now i just need to get some components and i'm at work.
    I will let you know as soon as i am done. Wish me luck.
     
  4. Audioguru

    Audioguru

    2,549
    574
    Sep 24, 2016
    The law says you must not transmit a radio signal without a licence. The RF cops will catch you if you cause interference to somebody receiving a real radio station. The FM transmitters used for transmitting your MP3's to your car radio have a range of only 1m.
    Good luck.
     
  5. Devnode

    Devnode

    92
    4
    Jul 13, 2015
    Hi, Audioguru. I take note of that. However the transmitter i first tried out was, like you told me, very bad. I exchanged the polyester caps with ceramics and it worked but very unsatisfyingly. So im going to try yours now. Im just waiting for my components then ill be onto it. I learned very valuablevlessons from that transmitter though and from your advice on this forum. Im very gratefull for that. Thanks untill i post a pic of my Audioguru tx on the forum. Be blessed.
     
  6. aakanksha5

    aakanksha5

    1
    0
    Tuesday
    Better replace the transistor and check out what it leads to?
     
  7. Audioguru

    Audioguru

    2,549
    574
    Sep 24, 2016
    The transistor has nothing to do with the unsatisfying results of the horrible extremely simple circuit that worked but performed and sounded bad.
     
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