fm transmitter

Discussion in 'Wireless & RF Design' started by mikeonthegreen, Jan 14, 2007.

  1. mikeonthegreen

    Thread Starter Member

    Jan 7, 2007
    21
    0
    I am interested in building an fm transmitter to plug into an MP3 player. Does anyone know where to find a schematic?
    :cool:
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    What kind of output power do you require. And what frequency range(s) are you looking for? (And are you familiar with government regulations concerning transmitters?)
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    With copyright law being so biased in favor of the holders, are you sure you want to take the risk of having the FBI kicking in your door?
     
  4. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
    Google these chips.....
    BH1415f
    and the
    BH1417f

    They are both PLL controlled Low Power FM transmitters with stereo multiplexing. Stable LPFM on designated frequencies is legal in many countries, but you should probably check your local laws before you start.

    There are also a number of kitsets out there as well.... many using the same series of ROHM I/C's... or the earlier inferior Non PLL version (BA1404)

    A BH1416 is also available, but it's preset frequencies are suited for the Japanese FM band (76-90Mhz).

    As a footnote, LPFM transmitters are Legal Here, and in Aus on 2 bands... 88 - 88.5 , and 106.7 - 108 Mhz (the bands the BH1417 is preset to) using an ERP up to 0.5 watt (with Xtal stability)... which gives surprisingly good coverage... (most of the town I live in). As for Music Copyright, AMCOS/APRA/PPL offer a deal for non-profit LPFM transmitters of $200 a year. Obviously that FAQ pertains to my country, and legalities will be different where ever you are.
     
  5. mikeonthegreen

    Thread Starter Member

    Jan 7, 2007
    21
    0
    Very interesting. It will be very interesting to learn more about this in my Communications class. Thanks!!!!
     
  6. mikeonthegreen

    Thread Starter Member

    Jan 7, 2007
    21
    0
    First of all the FBI is not the copyright police. It is a civil matter. It is the responsibilty of the copyright holder to take the offender to court.
    Second, I must apologize, I did not explain my intentions. This is a project for a communications class. I am not mass producing them nor selling them. Merely building on a bread board to develop a better understanding.
     
  7. zul

    New Member

    Jul 24, 2007
    1
    0
    i am a guy who needs help to do with my scool's project... i need to develope a fm transmitter.. i already have a circuit scemathics but the problem is i dont understands which is which...could anybody plz help me with this design...i need to know stuff like which is the modulater... the filter and everything...plz help me... email me at bulatan_z@yahoo.com. help!!!!
     
  8. gmrkiran

    New Member

    Sep 11, 2007
    8
    0
    i want to build a fm stereo transmitter low cost so pls suggest me a circuit
     
  9. gmrkiran

    New Member

    Sep 11, 2007
    8
    0
    fm transmitter circuit plz
     
  10. gmrkiran

    New Member

    Sep 11, 2007
    8
    0
    tondaraga pampa be lanja
     
  11. cumesoftware

    Senior Member

    Apr 27, 2007
    1,330
    10
  12. Gadget

    Distinguished Member

    Jan 10, 2006
    613
    0
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