long range stable fm transmitter


Posted on Feb 7, 2014

This is a long range stable FM transmitter circuit. The circuit is using a LM2950 5V voltage regulator IC comes in TO 92 transistor package, which will provide a stable 5V to the oscillator till the 9V battery runs down to 5. 5 volts, due to which the oscillator becomes frequency stable. The circuit is using two transistors, transistor Q1 is workin


long range stable fm transmitter
Click here to download the full size of the above Circuit.

g as an oscillator and Q2 is working as an RF amplifier and also separating the oscillator from the antenna due to which the circuit becomes more frequency stable. Coil L1 and L2 are air cored coils equal to 10 turns of 1mm enameled wire close wound on a 3mm form. The frequency of the transmitter can be adjusted with trimmer C4. The maximum output power can be achieved by adjusting the trimmer C5. A field strength meter or RF power meter will be required to set the transmitter on the maximum output power. Use 30 inch wire antenna for maximum range. Keep all the components as near as possible in the circuit. The maximum range of the circuit will be 2 KM or more in the open area.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    AVR terminal for serial port
    Night Safety Light For Autos
    IFA Antenna matching for CC2500
    car parking aid sensor
    hp max2338 mixer if saw filter match at 183 6mhz for cdma
    ir remote control tester
    diac controlled led flasher
    Automatic Ac Line Voltage Selector
    Circuit Project: Wireless Doorbell
    Wireless IR Headphones circuit
    2500W Phase Control
    AC Locomotive Auxiliary Equipment
    FFT audio amplifier design
    dtmf circuit
    Telephone Ringer
    PC Case USB LCD
    Amplifier circuit equivalent
    Capacitive load drive circuit diagram of the MAX4450 4451



    Top