Simple FM Transmitter Circuit

Hi, friends, Today I am going to describe of FM transmitter. You all listen FM radio stations on your mobile. In this post i tell you that how can you make own FM radio stations.

 FM radio is one the most important marketing place for advertisement. So try it, it is useful for you. The range of this FM transmitter circuit is about 100meters at 9V supply. The circuits of FM transmitter and also the parts or components of this circuit are as follows.....

 Circuit Diagram:-

                              

 

Part	Total Qty.	Description	Substitutions
C3	1	0.001uf Disc Capacitor
C4	1	5.6pf Disc Capacitor
C1,C2	2	10uf Electrolytic Capacitor
VC1	1	3-18pf Adjustable Cap
R6	1	270 Ohm 1/8W Resistor	270 Ohm 1/4W Resistor
R2,R3,R4	3	4.7k 1/8W Resistor	4.7K 1/4W Resistor
R5	1	10k 1/8W Resistor	10K 1/4W Resistor
R1	1	100k 1/8W Resistor	100K 1/4W Resistor
Q1, Q2	2	2N2222A NPN Transistor	2N3904, NTE123A
L1, L2	2	5 Turn Air Core Coil
MIC	1	Electret Microphone
MISC	1	9V Battery Snap, PC Board, Wire For Antenna

Some Tips For Making:-

1. L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after winding then install the coil on the circuit board, being careful not to bend it.
2. VC1 is used for tuning. This transmitter operates on the normal broadcast frequencies (88-108MHz).
3. Q1 and Q2 can also be 2N3904 or something similar.
4. You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors. 
5. You may want to bypass the battery with a .01uf capacitor.  
6. An antenna may not be required for operation. 

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