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88 108 MHz FM Transmitter Circuit

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The most important part of this 88-108 transmitter is the Colpitts oscillator. C3,C4,C5,C6,CD1-CD2 ans L1 determine the transmission frequency. The RF Oscillator circuit has the BF982 MosFet transistor wich is the active part. The others 2 transistors separate the VCO from antenna.

FM transmitter circuit diagram

fm transmitter circuit schematic with bfr90

The first stage BF199 amplifies the weak signal from the vco and functions in constant load. The second stage BFR90 amplifies the rf signal to load the antenna wich will radiate the radio frequency power.
Antenna can be one wire, 70 cm long. L1 coil has 1mm thick copper wire, 3.5 turns, 5 mm diameter and 1mm space between turns.
You can use BF199 instead of BFR90 and MV104 instead of the 2 varicape diodes.

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10 Responses to “88 108 MHz FM Transmitter Circuit”

  1. white says: on July 16, 2009 at 4:47 pm

    pls i get maintance manual of 10 killo watts transmitterfrom u
  2. GIDEON KIPKEMOI says: on December 12, 2009 at 7:04 am

    i am pleased with you article.i am student taking telecommunication couse.please sent me transmitter circuit daigram which is easy to build.thank you.
  3. m akram says: on December 21, 2009 at 11:34 am

    I NEED FM TRANSMETER PLZ HLP ME
  4. Ch.Atta Khan says: on January 7, 2010 at 11:26 am

    I Repair Fm Transmeter at home Help me
  5. norm says: on January 15, 2010 at 4:22 am

    please help, i need fm transmitter that is easy to build.. tnx
  6. sunardi says: on February 17, 2010 at 10:28 am

    I want to know about DIP Switch data frequecy setting for fm 88.0 mhz – 108.0 mhz. Please to my E-mail for its Thanks you. Cause I m very needed for Locked frequnce for fm tx
  7. sunardi says: on February 17, 2010 at 10:38 am

    And For my Email is : kissfmradio28@yahoo.co.id So I want to Introdfucing for The New Technology for IBBS FM RADIO/ INDONESIA BANGKIT BAHANA SUARA FM (Near Home Theather System). For its we want to Support from you all for to reality this project ? We needed some investor for to built & development this ibbs fm Radio. Notes : ibbs fm radio is my planing for Indonesia fucture. So Please help me for its ? Thanks
  8. hero says: on October 25, 2010 at 1:46 pm

    i am constructed a websit for fm transmitters see my web.in few days ,.thx
  9. pankaz kanti halder says: on September 20, 2011 at 3:51 pm

    sir actually wana made fm station.i tryed many but faill.please help me.+8801760939069
  10. bharathi.p says: on October 8, 2012 at 1:33 pm

    i want above 2km fm transmiter digram…. please help me..

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