stable fm transmitter

  
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There are many techniques to make an FM transmitter stable so it will not change its frequency as the battery runs down. The rf circuit shown below is a mini stable FM transmitter which is using a zener diode to provide accurate voltage to the oscillator while the battery runs down, due to which it will not drift its frequency. The circuit is simp
stable fm transmitter - schematic

le using few components but provide good range. The coil L is equal to 8 to 10 turns of #22 enameled wire wound on 6. 30 millimeters diameter form. The input voltage can be 9 or 12 volts DC. Keep all the components as near as possible and use 12 inch wire for antenna or use 30 inch wire antenna for greater range. If you require a long range with this circuit use diy fm antenna.



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