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    FM TRANSMITTER one Transistor by 2N3564, 2N5225

    This entry was posted on Monday, January 21st, 2008 at 10:03 pm and is filed under RF-Radio Frequency, fm transmitter. You can follow any responses to this entry through the RSS 2.0 feed.



     

    FM TRANSMITTER one Transistor by 2N3564, 2N5225

    FM TRANSMITTER one Transistor by 2N3564, 2N5225 - PCB

    A truly minimalist circuit. Performance is relatively poor and stability is a problem. Q1 modulates the signal and acts as an oscillator. L1 and C5 determine the frequency. Decrease C5 for a higher frequency and vice-versa.

    You won’t get a long range transmission with this one. The author claims 50-500 feet. A lot depends on the antenna. It must be made of stiff wire or else the frequency will change as you move the antenna. Experiment with different lengths to get the maximum range. 50cm or less should work reliably most of the time. A longer antenna might give even better range but if you exaggerate, the circuit will begin to oscillate and performance will drop dramatically. A regular telescope whip should work, too.

    Part
    R1 27k
    R2 56k
    R3 12k
    R4 100
    C1 1u
    C2, C3 470p
    C4 6 to 10p
    C5 1-30p trimmer
    L1 etched on PCB or a center-tapped coil 5mm in diameter, 6-8 turns of enamel-coated wire 1mm thick
    Mic Electret microphone
    Q1 2N3564, 2N5225 (other general-purpose NPN transistors will work, too)

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