Circuit's Blog :
Return to Blog1.5 Watt 1-2 km Range FM Transmitter
Posted Jan 10, 2012 at 3:36 pm
Figure 1
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
Comments on this post:
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4 years ago: This Is very Good circuit. i am very very like it.
chami from sri lanka
4 years ago: This circuit operates at what frequency?
4 years ago: I hope to know how I make the coil in this circuit?number of turns...........etc
4 years ago: in this circuit not celearly given of C1,C2[Positive and negative].
3 years ago: Plz tell anybody that at what frequency range does this transmitter worrks. plz reply soon.Its urgent.
3 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.
3 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.
3 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)
3 years ago: Please give me details of the parts. How many turns need to make coil. Whats ironing method.
3 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?
3 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
3 years ago: Hi Jeltz thank you very very much for your help. I appreciate you. (:
3 years ago: can any body provide me fm transmitter ckt range 10km
2 years ago: HI Please give me details of the parts. How many turns need to make coil. Whats ironing method
2 years ago: high five on this circuit! how wonderful that it has a very long range!!! :)
2 years ago: what frequencies does it operate?
2 years ago: hi this is good one but iam getting problem with range & coil
2 years ago: Plz give the Frquency Range and No of turns of the coil
2 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
2 years ago: this is a good range! thanks for sharing this to us!
2 years ago: please give me details of the coile AC.CB nembers
2 years ago: sa susunod paki
sy naman lahat ng components ok! THNX YOUR WELCOME
2 years ago: hello sir please specify the value of the inductor thank you
2 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...
2 years ago: jeltz sir please tell me about volt of capacitor. its urgent.
2 years ago: I hope to know how I make the coil in circuit? number of wire & number of truns coil .
2 years ago: I hope to know how I make the coil in circuit? number of wire & number of truns coil .
2 years ago: plz specfi the ckt diagram of wirless fm transmeter 5km range and also wireless video transmeter
2 years ago: what is the value of conductance in this circuit
2 years ago: sir tell me that how will I increseas frequancy of fm tranmitter.
1 year ago: can I use normal inductor the IC with required value than coiling it?
1 year 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...
1 year ago: What about antena...how can i make good one???
1 year 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
1 year 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.
1 year ago: can this circuit be modified to carry audio and video signals on vhf band ?
1 year ago: it is really good circuit i transmit signals up to 1000 meters...
9 months ago: i want to know the range of this FM...please .?
8 months ago: I add a BLX15 in it i reach 150 KMs no problems vely good circuit
1 month 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 weeks ago: YOU CAN ALSO TAKE HELP FORM HERE. I WILL DEFINITELY HELP YOU http://kpkpkalpesh.blogspot.in/2011/12/fm-radio-transmitter.html