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    FM Transmitter Circuit

     

    FM Transmitter Circuit

     

    Description

     

    An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier.

     

    Circuit Diagram

     

     

     

     

    Parts List

     

    R1 4K7        R4 150K         R7 3K9 (2K7)
    
    R2 4K7        R5 220R         R8 120R (82R)
    
    R3 4K7        R6 4K7
    
    All resistors except R8 are at least 0.25W rated. R8 is at least 0.5W rated
    (the 0.6W metal film M-series from Maplin can be used for R1-R8).
    
    C1 1n         C4 22uF         C7 10n         C10 1n
    
    C2 4u7        C5 1n           C8 1n
    
    C3 1n         C6 10n          C9 33pF
    
    VC1 5-60pF    IC1 LM358       Q1 ZTX108
    

    Circuit Notes

    L1 is 0.112uH (this tunes to the middle of the FM band, 98 MHz, with VC1 at its centre value of 33pF).

    L1 is 5 turns of 22 swg enamelled copper wire close-wound on a 5mm (3/16") diameter former. Alternatively, you can have a fixed 33pF cap instead of VC1 and have L1 as an adjustable molded coil (eg UF64U from Maplin). VC1 will give you a tuning range of 85 - 125 MHz, and a possible choice is the Philips type polypropylene film trimmer (Maplin code WL72P).

    Two sets of oscillator bias resistors are given, the ones in the brackets give about 20% more RF power.

    Mike is our favourite Omnidirectional sub-mini electret (Maplin code FS43W). Ant is a (lambda / 4) whip monopole (eg 76 cms of 22 swg copper wire).

    Q1 is configured as a Clapp oscillator. Frequency modulation results from the audio voltage changing the transistor's base-emitter capacitance.

     

     

     

     

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