Hi, I used 20pF(right below the inductor) in place of variable capacitor. Please use any ceramic capacitor between 1-100pF. For antenna(the green wire standing erect), you can use 5-10cm normal copper wire. best of luck.
can u please tell me what is the frequency i sould tune in my receiver…..?
i made nearly three circuits…nd came to ur circuit…which is using 2n 3904..
can i replace bc 547 in that place(Q1)…? plz reply i am preparing my self for mini project..
You can use 2N3904 or BC547. Your frequency depends upon the inductor you have used or made. And on that page, you can see the formula of frequency. Please calculate it yourself. You can still try all the FM bands. The formula is http://www.buildcircuit.com/wp-content/uploads/2011/01/equationB.jpg
You can get this formula on the same tutorial page.
thanks for replying…ur really a great helper..bcoz in other blogs i can find simply many ckts but no reply..about trouble shooting…
sorry for other question…whats the range of this transmitter…?
actually i constructed the ckt in three different circuits available in internet..but all of them failed..
in receiver i can hear ..popping sound when i made to hit the mic with screw driver..but voice is not transmitting
is there any tips for troubleshoot…any suggestions for ckt…
the range of the transmitter depends upon the length of the antenna. In your case, it should be around 10cm only.
Troubleshooting:
a. Did you scrap the ends of inductor? if you don’t scrap, it doesn’t work.
b. Keep wires of microphone short. If they are long, that introduces extra inductance and the frequency changes. Therefore, keep it short.
c. Follow the instructions given on the page carefully.
d. change the value of VC1- variable capacitor, you may keep 20pF, 22pF, 33pF, keep on trying…
e. In place of R1- 470, try with 330 Ohm resistor also.
f. In place of C2- 4.7pF, insert 100pF, or 20pF or some other nearest value capacitor. but it should be in pF only.
g. Check this video: how to make inductor: http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw
h. Check this video: how to connect electret mircophone: http://www.buildcircuit.com/how-to-use-electret-microphone/
Remember that this kind of radio projects don’t work in the first attempt, you have to make several hit and trails, best of luck.
ok..thanks for troubleshooting tips….any way i am using readily available inductor…
i am going to college and use ur trouble shoot tips and post the result after that testing….
May 29, 2012 at 9:00 pm
vamsi
i have doubt about antenna..to use whether 15cm or 10metres..i am in middle of my mini project..
I am sorry, my mistake, it is 10cm. Not 10m, it is obvious that 10meters is too long for such a small transmitter. Did you make the length of electret microphone very short? It should be short. And do you have an extra electret microphone? sometimes, while soldering, the microphone breaks down. So, always keep extra components. I will try to make the circuit again today (just for you) and let you know if there is any problem.
May 29, 2012 at 10:09 pm
vamsi
sir ..plz how to use trimmer capacitor…..VC1 ….it is having three terminals….by the way i am also connecting right now…is it possible to contact u in another way..bcoz its taking long time ..to contact u sir plz…
July 22, 2019 at 6:11 pm
sai ashwin
hi bro I want to know that at how much frequency you got the output?? please tell me fast as I am in middle of my project
sir …i tried on my bread board..i made changes as u said sir..it worked..but only i can hear popping sound…in ur previous reply u said that antenna height is 10metres…!. but u have used 15 cm only that to copper wire…i have used whip antenna like the antenna used in pocket fm radios…plz reply sir i am waiting …
Hey I like the circuit and am wondering if I could integrate it with my own project. I would like to control a servo for my home made RC car. If I were to put a potentiometer in place of the mic would the signal that I receive allow me to control the speed of a motor or a servo.
i am doing fm transmitter.
the transmitted output can be seen by mobile fm receiver.but i am not gettin the exact voice .
please tell me the exact freaquncy.
Hello,
Great job,i have personally implemented its working propely. How can the range of frequencies be extended to say over 10meters or so,using the same circuit design with little modifications?
Regards.
Hello,
Great job,i have personally implemented its working propely. How can the range of frequencies be extended to say over 10meters or so,using the same circuit design with little modifications?
Regards.
hi…..friend…….i used 2 transistors bc547, bf494 instead of 2N3904 , but i am confused with the transistor terminals .emitter , base , collector……please say me whether it is ebc , ceb , ceb? For both bc547 , bf497
can you explain how can we check a remote control usind transmitter and receiver i.e.,when a button is pressed on the remote,by seeing at the receiver end ,we should able to say which button is pressed??
What can i use instead of a Variable capacitor ?
i cant find one …. also what if i use 0.1 H Inductor instead of Copper coil. i cant find the said wire as well ! :(((
You need to have a variable capacitor to change the frequency. It will be very difficult for you otherwise to make the circuit work. And, I think 0.1H does not work. You need to have 0.1uH. see the video about how to make coil. It’s on this page.
I tried with microphone. I tried with jack wire. i didn’t find 4.7 pF and used 20 pf. I have something that has writen on it u4.7 not 4.7u is the same ting no ?
I used 1.2 uF it may be the problem?
I tried reciving fm sound with phone and radio. Didn’t work I tried every frequency.
Even I tried to calculate the frequency but I don’t know the exact valu of L …
Maybe you can tell me in what range of values (80-90 90-100) the correct frequency may be.
Thx in advice.
No, 1uH does not work. You can use wire from 21SW to 30SWG. See here how to make the inductor: http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw
Now, you should do hit and trial. It may work. Make three inductors with 5 turns, 6 turns and 7 turns and try with those three. I hope it helps.
the LC is the oscillator its self, a.k.a. tank circuit, it operates on a resonance frequency given by the formula. btw, i would suggest getting a frequency counter from ebay, its pretty cheap. so you can tune your fm receiver at that frequency, and you dont have to get a variable cap for that.
or you could just vary the length of your inductor to tune your transmitter.
looking at this formula:
L = [(d^2)(n^2)] / [18d + 40l]
L – in uH (inductor)
d – in inches (coil diameter)
l – coil length in inches
n – number of turns
ive been building transmitter for about 10years now. fm/pm/am/fsk/psk/etc.
Sir Good Day.. Can I ask how far this transmitter can transmit signal??how many meters?If i wanted to extend its range of transmission, what should I adjust or what should i change?
This is my first time here..Please reply sir..Thank You!!
Sir, I want to send music as my modulated signal. I am actually doing this for the first time. Can I use a female 3.5mm jack and connect it to an audio source? Please help me…
sir,what receiver can i use? in this there is no receiver circuit..
the receiver circuit should be tuned to the same frequency know… so can u post the receiver circuit….please….
My school Cleveland Institute of Electronics expands on the FM transmitter plan a little bit. Theirs has a larger range. Here is their posted building plan from one of their instructors: http://cie-wc.edu/freekitplans.aspx
Hi, I think this would be nice for a personal project but I have a question, Can i use an earphone jack instead of a microphone so that i can transmit the signal from an mp3 player (like an iphone) to the radio? If not, can I still use this design but only changing a few thing in order to make it work with a jack instead of a microphone?
Yes you can, just connect every line from your earphone jack microphone to the microphone entrance circuit or even you can use your small speaker as a microphone if you prefer. Just remember the circuit is not stereo and you have to join the line A with B from your mp3 player or other device speaker lines you want to use as source of sound with the positive line in the entrance of your circuit.
Switch on the transmiter , We have to get a reciever to acepts the signel. Give some sound to microphone. Switch on receiver (any fm radio). Now we can her the sound in receiver.
sir i am very new to this field and i bought a new multimeter dt830d but i am not sure whether it is working so how can i test it. i havve all the above components to make a transmittor
instead of wirewound inductor you made and as shown in description instead of wirewound inductor can i use a fixed 0.1uh inductor will the circuit work. and also tell me any circuit modification to increase the range. or any other circuit.
Hi, this design has some little problems! 1st the resistor for bias mic is to low it should be 47k for 9volt supply.
C2 must be 10p couse 4.7 is to low and T2 get some problem in turning on. and must important thing is that mic shouldn’t connect directly to base use 22nf capacitor to bipos it.
Hey Melaku, i think you first need a powerful battery plus you need to adjust the length of the antenna and look for a transistor with great amplification factor.
ain’t sure coz am a computer eng. student too but hope that the best i can say.
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So my group and I decided to try to modify this project a little, by replacing the microphone with a male headphone jack, we didn’t have a new one but I used one from an old pair of headphones. It didn’t seem to be working, but when we set it near the radio we were using as a test, after removing the jack because we were not getting a signal, we began to pick up other radio signals while varying the 0-100 uF capacitor. Does anyone have an idea of why it is doing this?
Thanks man,, is there any way of making a good antena,bcoz without antena my transmitter was giving 10 meters range,,with antena range was increasing but causing noise
Wow, FM Transmitter :D, great..
is it work well.., with that thing?
if can’t sound maybe on calibrating freq, tuning transistor to 88-108Mhz RF
the inductance is ok, nothing usefull with that, need 3mm long to create tuning form.
October 22, 2011 at 2:08 am
ampher
its a very good post
November 29, 2011 at 7:03 am
Imran
I copy this. Thanks
March 30, 2012 at 11:04 am
Pritesh
i cant found VC1 which is available in schematic diagram but not in BREADBOARD….and i also can’t see a ANTENNA clearly…
March 30, 2012 at 11:54 am
Sagar
Hi, I used 20pF(right below the inductor) in place of variable capacitor. Please use any ceramic capacitor between 1-100pF. For antenna(the green wire standing erect), you can use 5-10cm normal copper wire. best of luck.
May 28, 2012 at 7:54 am
vamsi
can u please tell me what is the frequency i sould tune in my receiver…..?
i made nearly three circuits…nd came to ur circuit…which is using 2n 3904..
can i replace bc 547 in that place(Q1)…? plz reply i am preparing my self for mini project..
May 28, 2012 at 9:28 am
Sagar
You can use 2N3904 or BC547. Your frequency depends upon the inductor you have used or made. And on that page, you can see the formula of frequency. Please calculate it yourself. You can still try all the FM bands. The formula is http://www.buildcircuit.com/wp-content/uploads/2011/01/equationB.jpg
You can get this formula on the same tutorial page.
May 28, 2012 at 10:46 am
vamsi
thanks for replying…ur really a great helper..bcoz in other blogs i can find simply many ckts but no reply..about trouble shooting…
sorry for other question…whats the range of this transmitter…?
actually i constructed the ckt in three different circuits available in internet..but all of them failed..
in receiver i can hear ..popping sound when i made to hit the mic with screw driver..but voice is not transmitting
is there any tips for troubleshoot…any suggestions for ckt…
May 28, 2012 at 11:31 am
Sagar
the range of the transmitter depends upon the length of the antenna. In your case, it should be around 10cm only.
Troubleshooting:
a. Did you scrap the ends of inductor? if you don’t scrap, it doesn’t work.
b. Keep wires of microphone short. If they are long, that introduces extra inductance and the frequency changes. Therefore, keep it short.
c. Follow the instructions given on the page carefully.
d. change the value of VC1- variable capacitor, you may keep 20pF, 22pF, 33pF, keep on trying…
e. In place of R1- 470, try with 330 Ohm resistor also.
f. In place of C2- 4.7pF, insert 100pF, or 20pF or some other nearest value capacitor. but it should be in pF only.
g. Check this video: how to make inductor: http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw
h. Check this video: how to connect electret mircophone: http://www.buildcircuit.com/how-to-use-electret-microphone/
Remember that this kind of radio projects don’t work in the first attempt, you have to make several hit and trails, best of luck.
May 28, 2012 at 11:54 am
vamsi
ok..thanks for troubleshooting tips….any way i am using readily available inductor…
i am going to college and use ur trouble shoot tips and post the result after that testing….
May 29, 2012 at 9:00 pm
vamsi
i have doubt about antenna..to use whether 15cm or 10metres..i am in middle of my mini project..
May 29, 2012 at 9:54 pm
Sagar
I am sorry, my mistake, it is 10cm. Not 10m, it is obvious that 10meters is too long for such a small transmitter. Did you make the length of electret microphone very short? It should be short. And do you have an extra electret microphone? sometimes, while soldering, the microphone breaks down. So, always keep extra components. I will try to make the circuit again today (just for you) and let you know if there is any problem.
May 29, 2012 at 10:09 pm
vamsi
sir ..plz how to use trimmer capacitor…..VC1 ….it is having three terminals….by the way i am also connecting right now…is it possible to contact u in another way..bcoz its taking long time ..to contact u sir plz…
July 22, 2019 at 6:11 pm
sai ashwin
hi bro I want to know that at how much frequency you got the output?? please tell me fast as I am in middle of my project
May 29, 2012 at 7:13 pm
vamsi
sir …i tried on my bread board..i made changes as u said sir..it worked..but only i can hear popping sound…in ur previous reply u said that antenna height is 10metres…!. but u have used 15 cm only that to copper wire…i have used whip antenna like the antenna used in pocket fm radios…plz reply sir i am waiting …
June 12, 2012 at 4:29 am
Jhon
Hey I like the circuit and am wondering if I could integrate it with my own project. I would like to control a servo for my home made RC car. If I were to put a potentiometer in place of the mic would the signal that I receive allow me to control the speed of a motor or a servo.
Thanks
June 20, 2012 at 12:23 pm
omprakash
i am doing fm transmitter.
the transmitted output can be seen by mobile fm receiver.but i am not gettin the exact voice .
please tell me the exact freaquncy.
June 20, 2012 at 1:05 pm
omprakash
can you tell me the exact range of transmition.
how far can plase the reasever.
can i use cell phone as receiver.
July 15, 2013 at 9:37 am
Abhi
Ya u can use by tuning to proper frequency.
July 4, 2012 at 5:31 am
Kaguai George
Hello,
Great job,i have personally implemented its working propely. How can the range of frequencies be extended to say over 10meters or so,using the same circuit design with little modifications?
Regards.
Kaguai George.
July 4, 2012 at 5:33 am
Kaguai George
Hello,
Great job,i have personally implemented its working propely. How can the range of frequencies be extended to say over 10meters or so,using the same circuit design with little modifications?
Regards.
Kaguai K George.
July 5, 2012 at 5:50 pm
anurag
which wire can be used as an antenna…..how much long it should be?
July 5, 2012 at 6:16 pm
Sagar
use a normal copper wire, that you are using as connector on breadboard. It should be 10-15cm long.
July 5, 2012 at 5:53 pm
anurag
can a wire serves as an antenna in fm transmitter…..if yes., which wire should be should be used as an antenna and how much long it should be?
July 5, 2012 at 6:16 pm
Sagar
use a normal copper wire, that you use as connector on breadboard. It should be 10-15cm long.
July 8, 2012 at 7:58 am
manan
i want to make a project whih transfer electriity using wirless antenna…not using coil…..is this possible…
July 9, 2012 at 10:50 am
Sagar
Not possible.
August 1, 2012 at 3:21 am
Gabrielstone
it is possible.cos i’ve seen it before on some invention site. what you are talking of is *airnergy* just google it up and confirm for yourself
February 24, 2013 at 8:19 pm
raj kumar
inductance L1-RADIUS HOW MUCHE
February 25, 2013 at 10:39 am
Sagar Sapkota
there is a video on this page. just check that.
July 9, 2012 at 5:12 pm
anurag
hi …friend i am confused with the trimmer capacitor , it has 3 terminals how to connect it in the circuit
July 9, 2012 at 5:19 pm
anurag
hi…..friend…….i used 2 transistors bc547, bf494 instead of 2N3904 , but i am confused with the transistor terminals .emitter , base , collector……please say me whether it is ebc , ceb , ceb? For both bc547 , bf497
August 15, 2012 at 12:47 am
jd qureshi
use multimeter to find the emiter collector base of a transistor …..!!
sitch the knob on diode symbol
July 9, 2012 at 5:50 pm
Raj
can you explain how can we check a remote control usind transmitter and receiver i.e.,when a button is pressed on the remote,by seeing at the receiver end ,we should able to say which button is pressed??
July 17, 2012 at 12:33 pm
rajat
what is L C in fomula of calculating frequency
August 29, 2012 at 3:20 am
mark amielee dela torre
l mean the value of the inductor while c the value of the capacitor
January 24, 2013 at 3:54 pm
abhishek bhati
but which one capacitor pls tell me…..is used to calculating freequency in formula……
August 4, 2012 at 5:34 pm
kiran
sir , please can u tell me what L&C mean in the formula for frequency please sir….
October 2, 2012 at 12:35 pm
Akshay
L in Inductance
C is Capacitance
f is frequency of circuit.
f=1/2Pi Underroot(L x C)
August 6, 2012 at 8:24 am
Shivam
I m nt gettin the 22nf capacitor. Wht can i us instead of that??? And i have got 0.001uf capacitor of code 103 instead of 102. Will it work??????
August 6, 2012 at 3:31 pm
Shivam
Hey m not gettin the 22nf capacitor. Wat else can i use instead of that???? Plz. Reply…..
August 10, 2012 at 7:40 pm
hart
sir, i cant find 4.7pF can I use 5pF instead?
September 6, 2012 at 10:04 pm
bright
sir, you are doing a nice job her but i have a problem. my transmitter works only when my hand is ontop vc1. pls i need help. thanks
September 13, 2012 at 4:44 pm
amir
at which frequeny i can recive my transmitted signal
September 29, 2012 at 7:24 pm
shashank
how to find frequency using the given formula
October 2, 2012 at 12:16 pm
Akshay
Please reply ! 🙁 need help …
What can i use instead of a Variable capacitor ?
i cant find one …. also what if i use 0.1 H Inductor instead of Copper coil. i cant find the said wire as well ! :(((
October 2, 2012 at 12:28 pm
Sagar Sapkota
You need to have a variable capacitor to change the frequency. It will be very difficult for you otherwise to make the circuit work. And, I think 0.1H does not work. You need to have 0.1uH. see the video about how to make coil. It’s on this page.
October 3, 2012 at 12:05 pm
Akshay
But you yourself have used a 20pF Cap. then why need for a variable one ?
and i will use 0.1uH instead of coil and 20pF instead of variable … will it work ? :O 🙂
October 3, 2012 at 5:52 pm
Sagar Sapkota
Yes, if you use fixed capacitor, then also it should work. But as a novice, I recommend you to use variable capacitor.
October 24, 2012 at 6:03 pm
benhar t.j
i hav’nt get trimmer capacitor. what can i do?
October 25, 2012 at 8:53 am
Sagar Sapkota
Then use a normal fixed ceramic capacitor between 20pF to 100pF.
July 28, 2013 at 6:31 pm
Abhi
Use c=20uf fix value or take out tunner frm old radio. Take simple relay switch & break it u’ll get coil.
October 13, 2012 at 11:28 pm
Radu
I tried with microphone. I tried with jack wire. i didn’t find 4.7 pF and used 20 pf. I have something that has writen on it u4.7 not 4.7u is the same ting no ?
I used 1.2 uF it may be the problem?
I tried reciving fm sound with phone and radio. Didn’t work I tried every frequency.
Even I tried to calculate the frequency but I don’t know the exact valu of L …
Maybe you can tell me in what range of values (80-90 90-100) the correct frequency may be.
Thx in advice.
November 1, 2012 at 7:14 am
chaitanya
sir……….i couldn’t find 0.1uh inductor nor 26swg wire in my city instead 1uh is available.will the circuit still work if i use 1uh…………reply ASAP
November 1, 2012 at 9:41 am
Sagar Sapkota
No, 1uH does not work. You can use wire from 21SW to 30SWG. See here how to make the inductor: http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw
Now, you should do hit and trial. It may work. Make three inductors with 5 turns, 6 turns and 7 turns and try with those three. I hope it helps.
November 22, 2012 at 8:26 pm
rezwan
i like that project here, bt this circuit has no carrier frequency circuit so how long it can be transmitted??
December 15, 2012 at 11:54 am
DAHB
the LC is the oscillator its self, a.k.a. tank circuit, it operates on a resonance frequency given by the formula. btw, i would suggest getting a frequency counter from ebay, its pretty cheap. so you can tune your fm receiver at that frequency, and you dont have to get a variable cap for that.
or you could just vary the length of your inductor to tune your transmitter.
looking at this formula:
L = [(d^2)(n^2)] / [18d + 40l]
L – in uH (inductor)
d – in inches (coil diameter)
l – coil length in inches
n – number of turns
ive been building transmitter for about 10years now. fm/pm/am/fsk/psk/etc.
November 26, 2012 at 5:50 am
Monika
Hello Sir,
Could you please explain in little detail the working of this circuit? Kindly reply!!
December 3, 2012 at 6:48 pm
mahmoud
Excuse me, at what frequency range does this circuit transmit?
I hope you will replay.
December 27, 2012 at 12:16 pm
Sagar Sapkota
should be 10meters.
December 31, 2012 at 5:45 pm
abdulbasit
frequency range??? in meters how is it possible
December 9, 2012 at 3:32 pm
goldriver
I am having simulating this circuit on multisim. Can someone please help?
December 13, 2012 at 8:50 am
DAVIES
i made one but i dont know the range how long does it transimt?
December 18, 2012 at 9:03 am
Saud
Sir, i would like to try to do this circuit
my doubt is how to test the signal ?? by using oscilloscope
please repay
best regards
December 19, 2012 at 10:59 am
Safiu Abiodun Adams
Sir, dis is my first time of entring this site, so where can i get the component in order to practise the experiment.
December 27, 2012 at 12:11 pm
Sagar Sapkota
You should get the components in local electronics store.
December 30, 2012 at 6:55 am
JAKE
Sir Good Day.. Can I ask how far this transmitter can transmit signal??how many meters?If i wanted to extend its range of transmission, what should I adjust or what should i change?
This is my first time here..Please reply sir..Thank You!!
January 12, 2013 at 9:41 pm
sudaco
I probe this and this is a lot of noise , so I think we need a farady jail
January 14, 2013 at 4:12 am
vicky
what is range covered by transmitter antenna.
January 15, 2013 at 7:06 pm
Sagar Sapkota
10 meters
January 24, 2013 at 3:58 pm
abhishek bhati
sir pls tell which capacitor value will be used in calculating the freequency in formula…………….
January 24, 2013 at 3:59 pm
abhishek bhati
sir pls tell me which capacitor value will be used in formula………………..
January 29, 2013 at 10:57 am
Shashank
Sir, I want to send music as my modulated signal. I am actually doing this for the first time. Can I use a female 3.5mm jack and connect it to an audio source? Please help me…
January 29, 2013 at 12:59 pm
prakhar
i dont find 2n3904 what another transister should i use in this place
January 31, 2013 at 12:39 pm
Noman Abbasi Sukkur
Hello ,
Dear Sagar Really You Are Nice Man and Helper :
Very Good Job :
Thankssss 🙂
February 6, 2013 at 12:50 pm
krishna
can we give the input of
3.5mm jack instead of microphone?
February 6, 2013 at 5:19 pm
vignesh
sir,what receiver can i use? in this there is no receiver circuit..
the receiver circuit should be tuned to the same frequency know… so can u post the receiver circuit….please….
March 9, 2013 at 4:04 pm
gemu
sir I used condensor mic will it work
Are there any values of variable capacitors because the shopkeeper ask me the value
March 10, 2013 at 8:43 am
Sagar Sapkota
The value of variable capacitor can be between 0-100pf. You can also use 20-100pF capacitor also.
February 7, 2013 at 10:51 am
Shuvojit das
Very nice and illustrated project. But I’m little unhappy with range 10 meters. Is there any shortcut way to increase it ?
February 27, 2013 at 4:04 pm
isaac
sir pls tell which capacitor value will be used in calculating the freequency in formula – See more at: http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter/#sthash.lYtj5LPK.dpuf
March 5, 2013 at 2:04 pm
Gurjeet
sir where you can use trimmer in transmitter circuit
March 8, 2013 at 9:15 am
pankaj
i want to switch diagram about following : 5 resistance,4 capacitance, capacitor,mic, antena, transmitter, transistor, +v&-v
March 11, 2013 at 4:48 pm
gemu
can i use a condensor mic
March 11, 2013 at 5:03 pm
Sagar Sapkota
YES
March 15, 2013 at 4:08 pm
Navnish
It is good.i’ll make it but whats the range of it?
March 15, 2013 at 7:00 pm
Sagar Sapkota
about 10 meters only
March 17, 2013 at 6:43 am
gemu
sir what happens if you increase the amount of coil turns
March 17, 2013 at 9:37 am
Sagar Sapkota
The inductance will change.
April 6, 2013 at 10:52 pm
Kartik
Inductance will increase if turns are iincrease or it will decrease if turns are decrease
July 28, 2013 at 6:13 pm
Abhi
Increases
March 18, 2013 at 11:17 am
Asad
Sir
I wand fm transmetter 2km range plez help me gave me full datel what price and were i bay.
April 1, 2013 at 4:52 pm
gemu
what if you increase the number of coil turns
July 28, 2013 at 6:09 pm
Abhi
It will vary inductance of coil resulting in frequency change.
April 4, 2013 at 10:37 am
F0X
Hello, how can I make the same FM circuit but with changeable frequency (transmitter and receiver).
April 4, 2013 at 4:49 pm
Ted
My school Cleveland Institute of Electronics expands on the FM transmitter plan a little bit. Theirs has a larger range. Here is their posted building plan from one of their instructors: http://cie-wc.edu/freekitplans.aspx
April 16, 2013 at 5:16 pm
holykem
this circuits building is very simple
April 20, 2013 at 8:06 am
Anish
whats that arrow before R1
April 24, 2013 at 5:31 am
Toxic
Hi, I think this would be nice for a personal project but I have a question, Can i use an earphone jack instead of a microphone so that i can transmit the signal from an mp3 player (like an iphone) to the radio? If not, can I still use this design but only changing a few thing in order to make it work with a jack instead of a microphone?
June 5, 2013 at 9:11 pm
Guillermo Villalta
Yes you can, just connect every line from your earphone jack microphone to the microphone entrance circuit or even you can use your small speaker as a microphone if you prefer. Just remember the circuit is not stereo and you have to join the line A with B from your mp3 player or other device speaker lines you want to use as source of sound with the positive line in the entrance of your circuit.
November 8, 2013 at 10:27 am
fami
it is nice
how can get inductor turn
do you possible if use earphone in please of mic
April 26, 2013 at 10:50 am
ravindra
how to check these transmitter after completing…
April 26, 2013 at 10:53 am
ravindra
please sir help me hou check after completing of these fm transmitter
May 25, 2013 at 8:41 pm
bruno
Just transmit any song in it and turn your reserves frequency until you set the song which u transmit.
June 15, 2013 at 4:42 pm
Jithin vk
How can increas the efficiancy of the transmitter
July 28, 2013 at 5:44 pm
Abhi
Switch ön the transmitter.then in recevier(any radio) tune that till u get reception keep transmitter 10 ft away from recevier
May 14, 2013 at 4:47 pm
Osmond
How will you make your fm transmitter board.
May 22, 2013 at 9:55 am
munna
nice really good post by fm transmitter circuit.
May 23, 2013 at 6:12 am
venkatlesh
it”s really very good job.
May 28, 2013 at 9:23 am
Anoop Jayaram
Switch on the transmiter , We have to get a reciever to acepts the signel. Give some sound to microphone. Switch on receiver (any fm radio). Now we can her the sound in receiver.
June 10, 2013 at 5:18 pm
rohit
sir i am very new to this field and i bought a new multimeter dt830d but i am not sure whether it is working so how can i test it. i havve all the above components to make a transmittor
June 10, 2013 at 7:31 pm
uday
instead of wirewound inductor you made and as shown in description instead of wirewound inductor can i use a fixed 0.1uh inductor will the circuit work. and also tell me any circuit modification to increase the range. or any other circuit.
July 15, 2013 at 3:06 pm
prashanth
yes u can use 0.1uh inductor in the circuit it wil works
June 14, 2013 at 10:14 am
Bob
If I replace the microphone with an audio jack would it transmit music from an MP3 player.
May 23, 2014 at 11:26 pm
Aman malik
yeah it’ll work,..
June 19, 2013 at 11:09 am
Dawa Sherpa
Sir, bc547 transistor and 2N3904 are same or diffrent?
October 1, 2013 at 1:08 pm
dfdbv
BOTH ARE SAME
July 3, 2013 at 6:25 am
Midhun babu
I like
July 13, 2013 at 5:41 pm
www.Webcomtois.fr
I visited various blogs however the audio feature for audio
songs current at this web site is actually excellent.
July 24, 2013 at 10:56 pm
Maurice
How you can calculate its frequency?
July 27, 2013 at 8:38 am
Shaishab Roy
To calculate the frequency using given formula what is the value of C=?
Please feedback me.
Thanks
July 28, 2013 at 5:34 pm
Abhi
Capacitance of trimmer or fixed capacitance (20uf)
July 29, 2013 at 2:25 pm
kirtan
which type of inductor can we use?
July 29, 2013 at 2:26 pm
kirtan
which typoe of inductor can we use?
July 29, 2013 at 2:29 pm
mori
hello..sir How we make the Inductor ?
September 3, 2013 at 2:29 pm
ashea
are all capacitors are ceramic? and does the negative side of the battery can be consider as a ground? help plsss thankz great post
September 13, 2013 at 11:11 am
Nameless
Hi, thanks for the post! But i dont see any variable capacitor in the picture with bread board! is that VC for fun!( i’m kidding! :D)
September 14, 2013 at 10:30 pm
Q factor!
Hi, this design has some little problems! 1st the resistor for bias mic is to low it should be 47k for 9volt supply.
C2 must be 10p couse 4.7 is to low and T2 get some problem in turning on. and must important thing is that mic shouldn’t connect directly to base use 22nf capacitor to bipos it.
September 20, 2013 at 2:06 pm
adi
Sir i made it bt it could not worked ……………
September 20, 2013 at 7:50 pm
vikrant
amzing its wrking for me
October 1, 2013 at 2:52 pm
Sonali Saini
Hello Sir,
Is there any way to create a FM transmitter of “480 kHz”?
If yes then please help me out.
October 3, 2013 at 8:17 pm
ali nawaz
really a graet and helpfull post for me thanks
October 12, 2013 at 10:10 am
siva
it is nice
how to receive transmitted signal?
October 16, 2013 at 6:22 am
Mithilanand Jha
sir please i request you answer this that to how to increase the range?
October 30, 2013 at 2:25 pm
wendesen melaku
I am a Communication Engineering student from Ethiopia. Your project seems smart. but what if I want the capacity to be raised to 1000m?
February 3, 2014 at 4:12 pm
Benz Narankz
Hey Melaku, i think you first need a powerful battery plus you need to adjust the length of the antenna and look for a transistor with great amplification factor.
ain’t sure coz am a computer eng. student too but hope that the best i can say.
November 3, 2013 at 8:12 am
ralf loren angeles
hi, do you have any FM transmitter with 10W of power., i would like to know if know how to build? this is may contance number +639266730147
December 17, 2013 at 5:46 am
zulqarnain haider
yea i have a transmitter if 10 w of power which was design by us in our final year project in our college
November 8, 2013 at 10:18 am
fami
it is nice
how you can find inductor turn
please give instruction.&
do you possible if you can use earphone ins ted of mic
November 26, 2013 at 9:46 am
marzuliani
hi. can i know what should be modified if i want the transmitter to transmit for about 8000 square feet. thanxs
March 20, 2014 at 12:13 am
darthvader
#haw i Ned to know hawwww ******** **
O
December 21, 2013 at 12:21 pm
Maneesh Kumar
is there any replacement for 22nf capacitor. can i use a 22 SWG enamel wire for making inductor???
January 3, 2014 at 2:29 pm
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February 7, 2014 at 7:31 am
ashish verma
i m too much benifited by this video
March 20, 2014 at 12:07 am
darthvader
not to bad . 🙂
March 20, 2014 at 12:10 am
darthvader
:W #$can you make it simpler$#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
🙁 i no have rite parts please send reply !!!!!!!!!!! need help emale darthvaderthe1@hotmail.com
April 12, 2014 at 11:02 pm
Motaz
i have .22uh inductor will it work??
April 16, 2014 at 10:47 pm
Mark C
So my group and I decided to try to modify this project a little, by replacing the microphone with a male headphone jack, we didn’t have a new one but I used one from an old pair of headphones. It didn’t seem to be working, but when we set it near the radio we were using as a test, after removing the jack because we were not getting a signal, we began to pick up other radio signals while varying the 0-100 uF capacitor. Does anyone have an idea of why it is doing this?
July 16, 2014 at 11:47 am
Nagaraju
I saw your circuit diagram, Your explanation is very nice, Thanks you very much. I want to make a
July 16, 2014 at 11:52 am
Nagaraju
Thanks for brief explanation.
August 21, 2014 at 6:30 pm
bharath
Can u explain the circuit operation
September 30, 2014 at 10:58 am
MD MOTINUR RAHMAN
THIS IS VERY NICE, ANY-MAN CAN RELY ON IT
October 11, 2014 at 11:35 am
Hasnain
Thanks man,, is there any way of making a good antena,bcoz without antena my transmitter was giving 10 meters range,,with antena range was increasing but causing noise
October 17, 2014 at 2:57 am
Miracel
worked for me. 🙂 such a friendly tutorial. thanks!!
October 24, 2014 at 6:09 am
Amdani Wijaya
From the formula above, if I use capacitor 20pF and inductor 0.1µH, that mean I will get frequency 112.60 MHZ, is right? Thanks.
October 27, 2014 at 9:07 am
Shihab vkm
tnx itis very good … my first attempt success … tnx
November 19, 2014 at 10:14 am
yogesh
thank you sir !! given circuit work properly !!
February 27, 2015 at 8:39 am
mohammed hameed
Great job Thank you
(102) code refer to 0.1uF not to 0.001uF
March 26, 2015 at 10:43 pm
mnasim31
Hi hameed bhai, can you recheck your ceramic data table. I think you are doing some mistake
February 28, 2015 at 6:55 am
sahib khan
sir how can finde the value of inductor and capacitor? it is possibl through multimeter?
February 28, 2015 at 8:43 am
sahib khan
how can finds the value of inductor through multimeter?
June 14, 2015 at 12:04 pm
Tuner
Wow, FM Transmitter :D, great..
is it work well.., with that thing?
if can’t sound maybe on calibrating freq, tuning transistor to 88-108Mhz RF
the inductance is ok, nothing usefull with that, need 3mm long to create tuning form.
Result, Not Work.. 😀 haha
June 21, 2015 at 3:56 am
pkd
hi , i am unable to found 2n1904 can i use any other transistor?
August 10, 2015 at 6:17 pm
jacky
hello how do connect bettery – and + ?plz help
July 15, 2016 at 5:49 am
Jayendra Mandradiar
I have a question about the formula.
I know L is inductance, but I want to to which capacitor value to use for C.
I am not able to find the frequency.
August 25, 2016 at 12:54 pm
Josef Danielsson
Is the 20pf capacitor necessary?
September 8, 2016 at 1:06 pm
Giri
How can I mix music or my voice through the transmitter.