Saturday 1 December 2012

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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3 comments:

Anonymous said...

Plz send me circuit of IR Sensor!

PRAKASH said...

NICE

Ackerley said...

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