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3Volt FM Transmitter for 88MHz to 108MHz

3Volt FM Transmitter for 88MHz to 108MHz3Volt FM Transmitter for 88MHz to 108MHz

The important allotment of the circuit is formed of the Colpitts blazon oscillator. C3,C4,C5,C6,CD1-CD2 and L1 determines the frequency. BF982 and bifold aboideau MOSFET are alive genitalia in oscillator. When the ascribe impedance of the MOSFET aboideau inputs are high, LC catchbasin is not affected. However transistors force the LC catchbasin and account appearance shift.

Two disciplinarian stages are added to abstract the antenna from oscillator. First date (BF199) amplifies the low arresting of the oscillator and works as a connected load. The additional date (BFR90) amplifies the arresting activity through the antenna some more. A abbreviate chestnut wire can be acclimated as an antenna here. Attaching a ample antenna to this ambit is accidental because the achievement ability is low.


1. Coil 1: Winding wire must be 1 mm thick and isolated. Number of turns: 3.5 . 5mm core must be used and the distance between each turn must be 1mm.
2. You can use BF199 instead of BFR90.
3. If you can't find the varicap diode, you can use MV104 instead.