FM Transmitter

Posted by Pranav Pareek on Dec 20, 2010 in Blog | 169 comments

This is a simple FM transmitter. It have an audio amplifier stage, modulation stage and finally an isolation stage of antenna and tank. All the components used are easily available. For making inductor use 28 AWG wire (the same wire which connects harddrive with motherboard), strip off the copper wire so you’ll be only left with wire and no outer cover. Now wound this wire (5 turns) on refill of a ball pen (the plastic tube that holds ink).
Range: 100-200 metrs
Note: I do not undertake any responsibly for usage of this transmitter.
here is the list of components i have used

2 x BC547 Transistors
1 x BC557 Transistor
Trimmer Cap. 3-18 pF
2 X 10nF Cap.
2.7 pF Cap.
1 nF Cap.
10 uF elec. Cap.
2.2k, 4.7k, 1M, 330, 330, 47 value resistance
dipole antenna(75 cms long one leg, copper wire can also be used)

Files:
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