Good FM Transmitter Circuit


Posted on Feb 4, 2014

This house FM transmitter for your stereo or any other amplifier provides a good signal strength up to a distance of 500 meters with a power output of about 200 mW. It works off a 9V battery. The audio-frequency modulation stage is built around transistor BF494 (T1), which is wired as a VHF oscillator and modulates the audio signal present at the


Good FM Transmitter Circuit
Click here to download the full size of the above Circuit.

base. Using preset VR1, you can adjust the audio signal level. The next stage is built around transistor BC548 (T2), which serves as a Class-A power amplifier. This stage is inductively coupled to the audio-frequency modulation stage. The antenna matching network consists of variable capacitor VC2 and capacitor C9. Adjust VC2 for the maximum transmission of power or signal strength at the receiver. For frequency stability, use a regulated DC power supply and house the transmitter inside a metallic cabinet. For higher antenna gain, use a telescopic antenna in place of the simple wire. Coils L1 and L2 are to be wound over the same air core such that windings for coil L2 start from the end point for coil L1. Coil winding




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Sound-activated-switch
    Audio Fader
    Night Safety Light For Autos
    Adjustable 20V Supply Circuit
    Another kind of relay driver board used to utilize your old PC
    Traffic Light Project
    beztlacitkova klavesnice
    FT232 USB to Serial Module
    MOSFETs and CMOS Inverter
    Home-Built Pulsed Multiple Gas (PMG) Laser
    Siren Driver circuit



    Top