How to Make FM Transmitter _ BUILD CIRCUIT

(http://www.buildcircuit.com)

We have published a NEW DIY FM transmitter kit. Please click here (http://www.buildcircuit.org/diy-

kits/50-fm-transmitter-diy-learning-kit.html)for circuit details:

(http://www.buildcircuit.com/simplest-and-cheapest-fm-

transmitter-do-it-yourselfdiy-kit-for-amateurs/)

(http://www.buildcircuit.org/diy-kits/50-fm-

transmitter-diy-learning-kit.html)

It is one of the easiest, simplest and the cheapest FM transmitter kit. You can buy it on buildcircuit.org

(http://www.buildcircuit.org/diy-kits/50-fm-transmitter-diy-learning-kit.html)

Description:

After getting several comments from young electronic students , I am rewriting this article to make the

FM transmitter making process more clear.

This tutorial is for making simplest FM transmitter using one transistor. You can make this project

with less components and it is an easy and simple project for beginners.

Before you proceed, please see the schematic given below. In the schematic, you will see the

components required for making an FM transmitter.The transmission range of this circuit is

approximately 10-20 meters.

The schematic of FM transmitter is given below:

How to make FM transmitterBasic Electronics (http://www.buildcircuit.com/category/basic-electronics-2/)

LDR Engineering (http://www.buildcircuit.com/category/basic-electronics-2/ldr-engineering/)

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(http://www.buildcircuit.com/wp-content/uploads/2011/01/Fm-transmitter-Copy.jpg)

You need the following components for this experiment:

1. Q1- Transistor- 2N3904

(http://www.buildcircuit.com/wp-content/uploads/2011/01/fm.jpg)

2. Capacitors- 4.7pF, 20pF, 0.001uF, 22nF.

Note: 0.001uF has code 102 and 22nF has code 223.

3. Variable capacitor: VC1. It is also called trimmer capacitor. You can buy one from your local store.

The capacitance range should be 0-100pF or 10-100pF. If you cannot get one, try to get a trimmer

capacitor that has minimum capacitance of 20pF. You can also get such capacitor from your broken

radio, but you may need assistance in getting that out from your radio.

(http://www.buildcircuit.com/wp-content/uploads/2011/01/captrim.jpg)

4. Resistors- 4.7 kilo Ohm, 470 Ohm

5. Condensor/ Electret Microphone ( http://www.buildcircuit.com/how-to-use-electret-microphone/)

(http://www.buildcircuit.com/wp-

content/uploads/2011/01/electretMicDrawing.gif) (http://www.buildcircuit.com/wp-

content/uploads/2011/01/mic.jpg)

On your electret microphone ( http://www.buildcircuit.com/how-to-use-electret-microphone/), you will

see that on one of the pins, there is solder pad connected to the case of microphone. Remember that

pin is always negative.

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content/uploads/2011/01/electretMicDrawing.gif)

6. Inductor- 0.1uF ( http://www.buildcircuit.org/capacitors/19-capacitor-ceramic-01uf.html).

6-7 turns using 26 SWG wire.

You need to scrap the ends of inductor, otherwise, the inductor won’t work. Check the video given

below to know how to make an inductor.

(http://www.buildcircuit.com/wp-content/uploads/2011/01/fm-transmitter-

circuit-31.jpg)

Or you can also use another inductor.

(http://www.buildcircuit.com/wp-content/uploads/2011/01/inductor-

EC.jpg)0.1uH

Learn to make an inductor for FM transmitter

7. Antenna: Use 15cm to 1 meter long wire for antenna. If you have a long antenna, the signal

transmission will be better.

The following picture shows the components used for making FM transmitter. You can simply follow

the steps shown below.

On the image shown below, you can notice that I have not used a trimmer/variable capacitor. I have

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(http://www.buildcircuit.com/wp-content/uploads/2011/01/fm-transmitter-circuit1.jpg)

(http://www.buildcircuit.com/wp-content/uploads/2011/01/equationB.jpg)

Insert transistor, resistors and capacitors on breadboard (

http://www.buildcircuit.com/category/breadboard-exercises/). You can see the values of the

components on the previous picture.


content/uploads/2011/01/fm-transmitter-circuit-1.jpg)

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Then, with a non-conductive tool, adjust the capacitor for the clearest reception, rotate it till the

receiver receives a sound from the microphone of transmitter. Use the following formula for

determining the frequency.

Set your FM receiver for a clear, blank station.

(http://www.buildcircuit.com/wp-content/uploads/2011/01/equationB.jpg)

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(http://www.buildcircuit.com/assembly-tutorial-

fm-transmitter-diy-kit/)

http://www.buildcircuit.com/ping-ultrasonic-range-finder-using-arduino-board/

http://www.buildcircuit.com/how-to-use-um66-or-bt66-musical-ic/




http://www.buildcircuit.com/tag/radio/

http://www.facebook.com/buildcircuitcom

http://www.flickr.com/photos/buildcircuit/

https://gist.github.com/buildcircuit

https://plus.google.com/+SAGARSAPKOTAbuildcircuit/posts

http://www.pinterest.com/buildcircuit/

http://feeds.feedburner.com/BuildCircuit

http://twitter.com/buildcircuit

http://www.youtube.com/ldremail

http://www.buildcircuit.com/author/buildcircuitcom/

http://www.buildcircuit.com/author/buildcircuitcom/

http://www.buildcircuit.com/assembly-tutorial-fm-transmitter-diy-kit/

http://www.buildcircuit.com/how-to-make-a-batteryless-crystal-set-radio/

Assembly tutorial- FM transmitterDIY kit(http://www.buildcircuit.com/assembly-tutorial-fm-transmitter-diy-kit/)

How to make a batteryless (crystalset) radio(http://www.buildcircuit.com/how-to-make-a-batteryless-crystal-set-radio/)

How to use electret microphone(http://www.buildcircuit.com/how-to-use-electret-microphone/)

FM transmitter and Dark sensor(http://www.buildcircuit.com/fm-transmitter-and-dark-sensor/)

Mark C

Apr 16, 2014 at 10:47 pm

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?

Motaz

Apr 12, 2014 at 11:02 pm

i have .22uh inductor will it work??

darthvader

Mar 20, 2014 at 12:10 am

:W #$can you make it simpler$#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

i no have rite parts please send reply !!!!!!!!!!! need help emale [email protected]

(mailto:[email protected])

darthvader

Mar 20, 2014 at 12:07 am

not to bad .

ashish verma

Feb 7, 2014 at 7:31 am

i m too much benifited by this video

6063

(http://www.buildcircuit.com/how-to-make-a-

batteryless-crystal-set-radio/)

4748

(http://www.buildcircuit.com/how-to-use-

electret-microphone/)

4853

1962

149 COMMENTS

Reply (/simple- steps- for- making- fm- transmitter/?replytoc om=59239#respond)





http://www.buildcircuit.com/assembly-tutorial-fm-transmitter-diy-kit/



http://www.buildcircuit.com/fm-transmitter-and-dark-sensor/

mailto:[email protected]



http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter/?replytocom=59239#respond





Savavieta.Lv (http://savavieta.lv/kur-pirkt-dvd-atskanotaju)

Jan 3, 2014 at 2:29 pm

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moment but I have bookmarked it and also added in your RSS feeds, so when

I have time I will be back to read much more, Please do keep up

the superb jo.

Maneesh Kumar

Dec 21, 2013 at 12:21 pm

is there any replacement for 22nf capacitor. can i use a 22 SWG enamel wire for making inductor???

marzuliani

Nov 26, 2013 at 9:46 am

hi. can i know what should be modified if i want the transmitter to transmit for about 8000 square

feet. thanxs

darthvader

Mar 20, 2014 at 12:13 am

#haw i Ned to know hawwww ******** **

O

fami

Nov 8, 2013 at 10:18 am

it is nice

how you can find inductor turn

please give instruction.&

do you possible if you can use earphone ins ted of mic

ralf loren angeles (http://none)

Nov 3, 2013 at 8:12 am

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

zulqarnain haider

Dec 17, 2013 at 5:46 am

yea i have a transmitter if 10 w of power which was design by us in our final year project in our

college









http://savavieta.lv/kur-pirkt-dvd-atskanotaju

http://none/









wendesen melaku

Oc t 30, 2013 at 2:25 pm

I am a Communication Engineering student from Ethiopia. Your project seems smart. but what if I want

the capacity to be raised to 1000m?

Benz Narankz (http://www.twitter.com/benz_narankz)

Feb 3, 2014 at 4:12 pm

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.

Mithilanand Jha

Oc t 16, 2013 at 6:22 am

sir please i request you answer this that to how to increase the range?

siva

Oc t 12, 2013 at 10:10 am

it is nice

how to receive transmitted signal?

ali nawaz

Oc t 3, 2013 at 8:17 pm

really a graet and helpfull post for me thanks

Sonali Saini

Oc t 1, 2013 at 2:52 pm

Hello Sir,

Is there any way to create a FM transmitter of “480 kHz”?

If yes then please help me out.

vikrant

Sep 20, 2013 at 7:50 pm

amzing its wrking for me

adi (http://no)

Sep 20, 2013 at 2:06 pm

Sir i made it bt it could not worked ……………









http://www.twitter.com/benz_narankz

http://no/









Q factor!

Sep 14, 2013 at 10:30 pm

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.

Nameless

Sep 13, 2013 at 11:11 am

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)

ashea

Sep 3, 2013 at 2:29 pm

are all capacitors are ceramic? and does the negative side of the battery can be consider as a ground?

help plsss thankz great post

mori

Jul 29, 2013 at 2:29 pm

hello..sir How we make the Inductor ?

kirtan (http://www.buildcircuit.com)

Jul 29, 2013 at 2:26 pm

which typoe of inductor can we use?

kirtan (http://www.buildcircuit.com)

Jul 29, 2013 at 2:25 pm

which type of inductor can we use?

Shaishab Roy

Jul 27, 2013 at 8:38 am

To calculate the frequency using given formula what is the value of C=?

Please feedback me.

Thanks

Abhi

Jul 28, 2013 at 5:34 pm

Capacitance of trimmer or fixed capacitance (20uf)



















Maurice

Jul 24, 2013 at 10:56 pm

How you can calculate its frequency?

www.Webcomtois.fr (http://www.webcomtois.fr)

Jul 13, 2013 at 5:41 pm

I visited various blogs however the audio feature for audio

songs current at this web site is actually excellent.

Midhun babu

Jul 3, 2013 at 6:25 am

I like

Dawa Sherpa

Jun 19, 2013 at 11:09 am

Sir, bc547 transistor and 2N3904 are same or diffrent?

dfdbv

Oc t 1, 2013 at 1:08 pm

BOTH ARE SAME

Bob

Jun 14, 2013 at 10:14 am

If I replace the microphone with an audio jack would it transmit music from an MP3 player.

Aman malik

May 23, 2014 at 11:26 pm

yeah it’ll work,..

uday

Jun 10, 2013 at 7:31 pm

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.









http://www.webcomtois.fr/









prashanth

Jul 15, 2013 at 3:06 pm

yes u can use 0.1uh inductor in the circuit it wil works

rohit

Jun 10, 2013 at 5:18 pm

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

Anoop Jayaram (http://electroniczcafe.blogspot.com)

May 28, 2013 at 9:23 am

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.

venkatlesh

May 23, 2013 at 6:12 am

it”s really very good job.

munna

May 22, 2013 at 9:55 am

nice really good post by fm transmitter circuit.

Osmond (http://Scienceandtechclub.webs.com)

May 14, 2013 at 4:47 pm

How will you make your fm transmitter board.

ravindra

Apr 26, 2013 at 10:53 am

please sir help me hou check after completing of these fm transmitter

bruno

May 25, 2013 at 8:41 pm

Just transmit any song in it and turn your reserves frequency until you set the song which u

transmit.

Jithin vk

Jun 15, 2013 at 4:42 pm









http://electroniczcafe.blogspot.com/

http://scienceandtechclub.webs.com/









How can increas the efficiancy of the transmitter

Abhi

Jul 28, 2013 at 5:44 pm

Switch ön the transmitter.then in recevier(any radio) tune that till u get reception keep transmitter

10 ft away from recevier

ravindra

Apr 26, 2013 at 10:50 am

how to check these transmitter after completing…

How to make FM transmitter (http://www.iphonefmtransmitter.net/wireless-audio/how-to-make-fm-

transmitter/)

Apr 25, 2013 at 12:10 pm

[...] Posted by: Sagar Sapkota on January 26, 2011 in Basic Electronics, LDR Engineering 94 Comments

[...]

Toxic

Apr 24, 2013 at 5:31 am

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?

Guillermo Villalta

Jun 5, 2013 at 9:11 pm

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.

fami

Nov 8, 2013 at 10:27 am

it is nice

how can get inductor turn

do you possible if use earphone in please of mic

Anish

Apr 20, 2013 at 8:06 am

whats that arrow before R1









http://www.iphonefmtransmitter.net/wireless-audio/how-to-make-fm-transmitter/









holykem

Apr 16, 2013 at 5:16 pm

this circuits building is very simple

Ted (http://www.cie-wc.edu)

Apr 4, 2013 at 4:49 pm

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 (http://cie-wc.edu/freekitplans.aspx)

F0X

Apr 4, 2013 at 10:37 am

Hello, how can I make the same FM circuit but with changeable frequency (transmitter and receiver).

gemu

Apr 1, 2013 at 4:52 pm

what if you increase the number of coil turns

Abhi

Jul 28, 2013 at 6:09 pm

It will vary inductance of coil resulting in frequency change.

Asad

Mar 18, 2013 at 11:17 am

Sir

I wand fm transmetter 2km range plez help me gave me full datel what price and were i bay.

gemu

Mar 17, 2013 at 6:43 am

sir what happens if you increase the amount of coil turns

Sagar Sapkota (http://buildcircuit.com)

Mar 17, 2013 at 9:37 am

The inductance will change.










http://www.cie-wc.edu/

http://cie-wc.edu/freekitplans.aspx

http://buildcircuit.com/










Kartik

Apr 6, 2013 at 10:52 pm

Inductance will increase if turns are iincrease or it will decrease if turns are decrease

Abhi

Jul 28, 2013 at 6:13 pm

Increases

Navnish

Mar 15, 2013 at 4:08 pm

It is good.i’ll make it but whats the range of it?


Mar 15, 2013 at 7:00 pm

about 10 meters only

gemu

Mar 11, 2013 at 4:48 pm

can i use a condensor mic


Mar 11, 2013 at 5:03 pm

YES

pankaj (http://www.musicallifes.com)

Mar 8, 2013 at 9:15 am

i want to switch diagram about following : 5 resistance,4 capacitance, capacitor,mic, antena,

transmitter, transistor, +v&-v

Gurjeet

Mar 5, 2013 at 2:04 pm

sir where you can use trimmer in transmitter circuit

isaac

Feb 27, 2013 at 4:04 pm

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

(http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter/#sthash.lYtj5LPK.dpuf)










http://www.musicallifes.com/








Shuvojit das (http://www.circuitstune.com)

Feb 7, 2013 at 10:51 am

Very nice and illustrated project. But I’m little unhappy with range 10 meters. Is there any shortcut

way to increase it ?

vignesh

Feb 6, 2013 at 5:19 pm

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….

gemu

Mar 9, 2013 at 4:04 pm

sir I used condensor mic will it work

Are there any values of variable capacitors because the shopkeeper ask me the value


Mar 10, 2013 at 8:43 am

The value of variable capacitor can be between 0-100pf. You can also use 20-100pF capacitor

also.

krishna

Feb 6, 2013 at 12:50 pm

can we give the input of

3.5mm jack instead of microphone?

#14-Radio DIY | Open Ateliers (http://openatelier.reso-nance.org/2013/02/14-radio-diy/)

Feb 6, 2013 at 11:31 am

[...] cette présentation, nous avons construit un émetteur radio FM en suivant les plans de ce site :

http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter

(http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter). C’est un plan très simple et qui

a marché (!). En testant notre émetteur avec un poste de [...]

Noman Abbasi Sukkur (http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter/)

Jan 31, 2013 at 12:39 pm

Hello ,

Dear Sagar Really You Are Nice Man and Helper :

Very Good Job :

Thankssss







http://www.circuitstune.com/


http://openatelier.reso-nance.org/2013/02/14-radio-diy/

http://www.buildcircuit.com/simple-steps-for-making-fm-transmitter








prakhar

Jan 29, 2013 at 12:59 pm

i dont find 2n3904 what another transister should i use in this place

Shashank

Jan 29, 2013 at 10:57 am

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…

abhishek bhati

Jan 24, 2013 at 3:59 pm

sir pls tell me which capacitor value will be used in formula………………..

abhishek bhati

Jan 24, 2013 at 3:58 pm

sir pls tell which capacitor value will be used in calculating the freequency in formula…………….

vicky

Jan 14, 2013 at 4:12 am

what is range covered by transmitter antenna.


Jan 15, 2013 at 7:06 pm

10 meters

sudaco

Jan 12, 2013 at 9:41 pm

I probe this and this is a lot of noise , so I think we need a farady jail

JAKE

Dec 30, 2012 at 6:55 am

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!!

Safiu Abiodun Adams

Dec 19, 2012 at 10:59 am


















Sir, dis is my first time of entring this site, so where can i get the component in order to practise the

experiment.


Dec 27, 2012 at 12:11 pm

You should get the components in local electronics store.

Saud

Dec 18, 2012 at 9:03 am

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

DAVIES

Dec 13, 2012 at 8:50 am

i made one but i dont know the range how long does it transimt?

goldriver

Dec 9, 2012 at 3:32 pm

I am having simulating this circuit on multisim. Can someone please help?

mahmoud (http://www.mahmoudrabai.facebook.com)

Dec 3, 2012 at 6:48 pm

Excuse me, at what frequency range does this circuit transmit?

I hope you will replay.


Dec 27, 2012 at 12:16 pm

should be 10meters.

abdulbasit

Dec 31, 2012 at 5:45 pm

frequency range??? in meters how is it possible

Monika

Nov 26, 2012 at 5:50 am

Hello Sir,









http://www.mahmoudrabai.facebook.com/









Could you please explain in little detail the working of this circuit? Kindly reply!!

rezwan

Nov 22, 2012 at 8:26 pm

i like that project here, bt this circuit has no carrier frequency circuit so how long it can be

transmitted??

DAHB

Dec 15, 2012 at 11:54 am

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.

chaitanya

Nov 1, 2012 at 7:14 am

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


Nov 1, 2012 at 9:41 am

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

(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.

Radu

Oc t 13, 2012 at 11:28 pm

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.








http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw







Akshay

Oc t 2, 2012 at 12:16 pm

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 ! :(((


Oc t 2, 2012 at 12:28 pm

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.

Akshay

Oc t 3, 2012 at 12:05 pm

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


Oc t 3, 2012 at 5:52 pm

Yes, if you use fixed capacitor, then also it should work. But as a novice, I recommend you to use

variable capacitor.

benhar t.j

Oc t 24, 2012 at 6:03 pm

i hav’nt get trimmer capacitor. what can i do?


Oc t 25, 2012 at 8:53 am

Then use a normal fixed ceramic capacitor between 20pF to 100pF.

Abhi

Jul 28, 2013 at 6:31 pm

Use c=20uf fix value or take out tunner frm old radio. Take simple relay switch & break it u’ll get

coil.

shashank

Sep 29, 2012 at 7:24 pm

how to find frequency using the given formula














amir

Sep 13, 2012 at 4:44 pm

at which frequeny i can recive my transmitted signal

bright

Sep 6, 2012 at 10:04 pm

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

hart

Aug 10, 2012 at 7:40 pm

sir, i cant find 4.7pF can I use 5pF instead?

Shivam

Aug 6, 2012 at 3:31 pm

Hey m not gettin the 22nf capacitor. Wat else can i use instead of that???? Plz. Reply…..

Shivam

Aug 6, 2012 at 8:24 am

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??????

kiran

Aug 4, 2012 at 5:34 pm

sir , please can u tell me what L&C mean in the formula for frequency please sir….

Akshay

Oc t 2, 2012 at 12:35 pm

L in Inductance

C is Capacitance

f is frequency of circuit.

f=1/2Pi Underroot(L x C)

how to make sensative n less distorted (http://www.edaboard.com/thread260963.html#post1117485)

Jul 30, 2012 at 10:34 pm

[...] kk sir i ll go through all these now please check this one here is the link below :-

http://www.buildcircuit.com/simple-s (http://www.buildcircuit.com/simple-s)…m-transmitter/ what

about this one ? is it good one or not ? Reply With Quote + Post [...]









http://www.edaboard.com/thread260963.html#post1117485

http://www.buildcircuit.com/simple-s









rajat

Jul 17, 2012 at 12:33 pm

what is L C in fomula of calculating frequency

mark amielee dela torre

Aug 29, 2012 at 3:20 am

l mean the value of the inductor while c the value of the capacitor

abhishek bhati

Jan 24, 2013 at 3:54 pm

but which one capacitor pls tell me…..is used to calculating freequency in formula……

Raj

Jul 9, 2012 at 5:50 pm

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??

anurag

Jul 9, 2012 at 5:19 pm

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

jd qureshi

Aug 15, 2012 at 12:47 am

use multimeter to find the emiter collector base of a transistor …..!!

sitch the knob on diode symbol

anurag

Jul 9, 2012 at 5:12 pm

hi …friend i am confused with the trimmer capacitor , it has 3 terminals how to connect it in the circuit

manan

Jul 8, 2012 at 7:58 am

i want to make a project whih transfer electriity using wirless antenna…not using coil…..is this

possible…















Sagar (http://buildcircuit.com)

Jul 9, 2012 at 10:50 am

Not possible.

Gabrielstone

Aug 1, 2012 at 3:21 am

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

raj kumar

Feb 24, 2013 at 8:19 pm

inductance L1-RADIUS HOW MUCHE


Feb 25, 2013 at 10:39 am

there is a video on this page. just check that.

anurag

Jul 5, 2012 at 5:53 pm

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?


Jul 5, 2012 at 6:16 pm

use a normal copper wire, that you use as connector on breadboard. It should be 10-15cm long.

anurag

Jul 5, 2012 at 5:50 pm

which wire can be used as an antenna…..how much long it should be?


Jul 5, 2012 at 6:16 pm

use a normal copper wire, that you are using as connector on breadboard. It should be 10-15cm

long.

Kaguai George

Jul 4, 2012 at 5:33 am



















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.

Kaguai George

Jul 4, 2012 at 5:31 am

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.

omprakash

Jun 20, 2012 at 1:05 pm

can you tell me the exact range of transmition.

how far can plase the reasever.

can i use cell phone as receiver.

Abhi

Jul 15, 2013 at 9:37 am

Ya u can use by tuning to proper frequency.

omprakash

Jun 20, 2012 at 12:23 pm

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.

Jhon

Jun 12, 2012 at 4:29 am

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

vamsi

May 29, 2012 at 7:13 pm

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 …















vamsi

May 28, 2012 at 7:54 am

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

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 (http://www.buildcircuit.com/wp-

content/uploads/2011/01/equationB.jpg)

You can get this formula on the same tutorial page.

vamsi

May 28, 2012 at 10:46 am

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

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 (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/ (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.

vamsi

May 28, 2012 at 11:54 am







http://www.youtube.com/watch?feature=player_embedded&v=UcRY_bqTTfw





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….

vamsi

May 29, 2012 at 9:00 pm

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

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.

vamsi

May 29, 2012 at 10:09 pm

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…

Pritesh

Mar 30, 2012 at 11:04 am

i cant found VC1 which is available in schematic diagram but not in BREADBOARD….and i also can’t

see a ANTENNA clearly…


Mar 30, 2012 at 11:54 am

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.

Imran

Nov 29, 2011 at 7:03 am

I copy this. Thanks

ampher

Oc t 22, 2011 at 2:08 am

its a very good post





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