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    FM Transmitter 5

     

    Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.

    Schematic

    This is the schematic of the FM Transmitter

    PC Board Layout and Parts Placement

    This is the printed circuit layout and parts placement of the FM Transmitter

    Parts

    Part
    Total Qty.
    Description
    Substitutions
    C1 1 0.001uf Disc Capacitor  
    C2 1 5.6pf Disc Capacitor  
    C3,C4 2 10uf Electrolytic Capacitor  
    C5 1 3-18pf Adjustable Cap  
    R1 1 270 Ohm 1/8W Resistor 270 Ohm 1/4W Resistor
    R2,R5,R6 3 4.7k 1/8W Resistor 4.7K 1/4W Resistor
    R3 1 10k 1/8W Resistor 10K 1/4W Resistor
    R4 1 100k 1/8W Resistor 100K 1/4W Resistor
    Q1, Q2 2 2N2222A NPN Transistor 2N3904, NTE123A
    L1, L2 2 5 Turn Air Core Coil  
    MIC 1 Electret Microphone  
    MISC 1 9V Battery Snap, PC Board, Wire For Antenna  

    Notes

       

    1. L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after winding then install the coil on the circuit board, being careful not to bend it.
    2.  

    3. C5 is used for tuning. This transmitter operates on the normal broadcast frequencies (88-108MHz).
    4.  

    5. Q1 and Q2 can also be 2N3904 or something similar.
    6.  

    7. You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors.
    8.  

    9. You may want to bypass the battery with a .01uf capacitor.
    10.  

    11. An antenna may not be required for operation.
    12.  

    13. A thanks goes out to [email protected] for cleaning up the original image once displayed on the page. It looks a lot better now!

     

     

     

     

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