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Fm transmitter data pins, what are they for?

Discussion in 'Radio and Wireless' started by sebastian engman, Dec 3, 2017.

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  1. sebastian engman

    sebastian engman

    1
    0
    Dec 3, 2017
    Hey! first post, i dont think this is the right part of the forum but i'll post here.

    So i got this fm transmitter from ebay(1$), it works and every thing but the darn thing has 3 pins that i have no clue what they are for, so I hope you can help me!

    Diagram: https://i.ebayimg.com/images/g/OlEAAOSwV0RXvbhw/s-l1600.jpg


    Regards sebastian.
     

    Attached Files:

  2. Bluejets

    Bluejets

    4,208
    893
    Oct 5, 2014
    Morse code key???
     
  3. kellys_eye

    kellys_eye

    4,275
    1,146
    Jun 25, 2010
    Potentially connects to a stereo audio source via the usual 3.5mm audio plug.
     
  4. Audioguru

    Audioguru

    2,924
    654
    Sep 24, 2016
    The FM transmitter circuit is cheap:
    1) It is missing a voltage regulator so its radio frequency slowly changes as the battery voltage runs down.
    2) It is missing pre-emphasis that all FM radio stations have so its sounds heard on an FM radio will sound muffled like your stereo with its treble tone control turned all the way down.
    3) Is its range farther than across the street?
     
  5. Alec_t

    Alec_t

    2,882
    770
    Jul 7, 2015
    Hopefully not, if it's interfering with other people's FM reception :).
     
  6. Audioguru

    Audioguru

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    654
    Sep 24, 2016
    If it interferes with other people's FM reception then it is useless. It should be tuned to a clear channel that does not have a radio station.
     
  7. FuZZ1L0G1C

    FuZZ1L0G1C

    368
    117
    Mar 25, 2014
    Re stereo FM transmitter pins:
    FMTX-answ.png
     
  8. Audioguru

    Audioguru

    2,924
    654
    Sep 24, 2016
    The jack plug shorts left and right stereo signal source channels together which might destroy the signal source. The simple transmitter is mono, not stereo.
     
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