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:-
- 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.
- VC1 is used for tuning. This transmitter operates on the normal broadcast frequencies (88-108MHz).
- Q1 and Q2 can also be 2N3904 or something similar.
- You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors.
- You may want to bypass the battery with a .01uf capacitor.
- An antenna may not be required for operation.
3 comments:
Plz send me circuit of IR Sensor!
NICE
Somewhere the content of the blog surrounded by little arguments. Yes it is healthy for readers. They can include this kind of language in their writing skill as well as while group discussion in college.Fm Radio Online
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