stable fm transmitter

Posted on Feb 7, 2014

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
Click here to download the full size of the above Circuit.

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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