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Electrical/Electronics Blogger

1.5 Watt 1-2 km Range FM Transmitter

Here is a well designed FM transmitter circuit that works effectively in 1 – 2 km range.

Input source is an electret condenser microphone and signal gain can be adjusted by using the potentiometer P1. You can easily prepare the PCB by using any PCB editor and apply it to the board by using the ironing method. The coils and the antenna can be designed as a part of the PCB made up of the copper area.

R1=220K
R2=4.7K
R3,R4=10K
R5=100ohm

C1,C2=4.7uF Electrolytic
C3,C4=1nF
C5=2-15pF
C6=3.3pF

Q1=BC547C
Q2=2N2219A
P1=25K
MIC=Electret Condenser Type

Tags: FM Transmitter,

Comments on this post:

By chaminda bandara 0Score:

7 years ago:  This Is very Good circuit. i am very very like it.
chami from sri lanka

By Jason Ancheta 0Score:

7 years ago:  This circuit operates at what frequency?

By hossam anwar 0Score:

7 years ago:  I hope to know how I make the coil in this circuit?number of turns...........etc

By vishwajeet 0Score:

7 years ago:  in this circuit not celearly given of C1,C2[Positive and negative].

By onkar 0Score:

6 years ago:  Plz tell anybody that at what frequency range does this transmitter worrks. plz reply soon.Its urgent.

By benny 0Score:

6 years ago:  can u give the exact turns, size and diameter and phasing of the coil used and the frequency of operations.

thank's and regards.

By Sandy 0Score:

6 years ago:  Sir i am an engineering student i want to make this 1-5 km fm transmitter. But sir please tell me about the size,turn,diameter and inductance of coil so that we can joined the coil. Also tell me about the terminals of C1 & C2(+ve or -ve), Please send me the information as soon as possible.

By Wahid 0Score:

6 years ago:  sir can u please send me the watt and volts of registers and capacitors? Also need complete diagram with positive negetive of capacitors. Please send me by mail: .(JavaScript must be enabled to view this email address)

By Seng Un 0Score:

5 years ago:  Please give me details of the parts. How many turns need to make coil. Whats ironing method.

By monica 0Score:

5 years ago:  hi this is exactly what i was lookin for..can u please tell me the details of the components??the number of turns etc?

By Jeltz 0Score:

5 years ago:  For FM, coil will be small. use thin gauge enamel magnet wire. the diameter of coil will be a couple mm: use ink tube from pen to form, and try 8-12 turns. small inductance coils make for much guess work. smaller coil means higher frequency and vice versa. you will likely tap inductor 10-30% the way from transistor side.

Ok, C6 is 3.3pF. this is very very small. google "gimmick capacitor", my english is too crappy for explanation. again much guess work needed.

C1 and C2 should be non-polar ceramic caps. they should be around 10-100nF for both. they for low voltage/high freq AC coupling and DC isolation to help make for high input impedance.

Have I said this is much guess work? =]
Hope I helped some

By monica 0Score:

5 years ago:  Hi Jeltz thank you very very much for your help. I appreciate you. (:

By Gandharv 0Score:

5 years ago:  can any body provide me fm transmitter ckt range 10km

By KAWISS 0Score:

5 years ago:   HI Please give me details of the parts. How many turns need to make coil. Whats ironing method

By dingdong dantes 0Score:

5 years ago:  high five on this circuit! how wonderful that it has a very long range!!! :)

By Eiffel 0Score:

5 years ago:  what frequencies does it operate?

By aryn 0Score:

5 years ago:  hi this is good one but iam getting problem with range & coil

By Satya 0Score:

5 years ago:  Plz give the Frquency Range and No of turns of the coil

By faisal 0Score:

5 years ago:  how can we know the actual parametes to make the coil and how can we know the value of coil without meter that is henry,milli henry etc.what is the inductance of the coil used in this circuit

By nazr mohammed 0Score:

5 years ago:  this is a good range! thanks for sharing this to us!

By houssem zidi 0Score:

5 years ago:  please give me details of the coile AC.CB nembers

By bora 0Score:

5 years ago:  sa susunod paki
sy naman lahat ng components ok! THNX YOUR WELCOME

By bora 0Score:

5 years ago:  hello sir please specify the value of the inductor thank you

By David 0Score:

5 years ago:  unless you are a rf guru, you would have to experiment with 10,000 different components to get this to work. we need a lot more info...

By vyas verma 0Score:

5 years ago:  jeltz sir please tell me about volt of capacitor. its urgent.

By nathi ram 0Score:

5 years ago:  I hope to know how I make the coil in circuit? number of wire & number of truns coil .

By nathi ram 0Score:

5 years ago:  I hope to know how I make the coil in circuit? number of wire & number of truns coil .

By nooruddin 0Score:

5 years ago:  plz specfi the ckt diagram of wirless fm transmeter 5km range and also wireless video transmeter

By kashif 0Score:

5 years ago:  what is the value of conductance in this circuit

By paras 0Score:

5 years ago:  sir tell me that how will I increseas frequancy of fm tranmitter.

By derej 0Score:

4 years ago:  can I use normal inductor the IC with required value than coiling it?

By nisarg 0Score:

4 years ago:  everyone, you can make an inductor using 24 gauge wire wind it 6 turns on a simple pensile, laide by both side...i suceeded...

By coolrobot 0Score:

4 years ago:  What about antena...how can i make good one???

By luka 0Score:

4 years ago:  what is the exact no of tones for A-c and C-B
what is the cost of ditortion after implemnting the circuit all about the 2n2219 transistor

By Bello muhammad makwashe 0Score:

4 years ago:  Pls when i add coupling stage should i add voltage? I hope some body helf me about this by sending me through facebook use with my name.

By mukesh harsh 0Score:

3 years ago:  can this circuit be modified to carry audio and video signals on vhf band ?

By Azmat005 frm Pakistan 0Score:

3 years ago:  it is really good circuit i transmit signals up to 1000 meters...

By harsha 0Score:

3 years ago:   i want to know the range of this FM...please .?

By crux 0Score:

3 years ago:  I add a BLX15 in it i reach 150 KMs no problems vely good circuit

2 years ago:  HELLO FRIENDS,
I MAID THIS PROJECT SUCCESSFULLY. WITH PROPER FREQUENCY AND STRENGTH.IF YOU WANT HELP THEN CONTACT ME ON .(JavaScript must be enabled to view this email address) or at 08866792042…… i will surly help you to bring out you from the problem :)

2 years ago:  YOU CAN ALSO TAKE HELP FORM HERE. I WILL DEFINITELY HELP YOU http://kpkpkalpesh.blogspot.in/2011/12/fm-radio-transmitter.html

1 year ago:  you can buy it in VERY VERY LOW COST....FROM

http://www.fmuser.org/

no need to wast time.....

fm transmitter 10 watt 15w,20w and so on....VISIT ONCE..