How to make an FM Transmitter
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- Опубликовано: 21 июл 2024
- In today's video, we learn the basics of FM Radio transmission and how to make a FM radio Transmitter. The most proactively use I can think of for this is just as a device to play music from your phone on your car's radio, although the principal could be scaled up, it is likely illegal without a radio license to broadcast to a large area. So yeah! Thanks guys! :)
Intro Made by Tate Storey, check out his channel! : • Thing that happened to me
List of Materials:
0. Transistor (Q1)- S9018.
1. R1- 2.2K
2. R2- 22K
3. R3- 2.2K
4. R4- 33 Ohm
5. R5- 33 Ohm
6. C1- 0.1uF(Code- 104)
7. C2- 0.1uF (Code- 104)
8. C3- 680pF(Code- 681)
9. C4- 30pF-120pF variable Capacitor
10. C5- 10pF(Code- 10)
11. C6- 30pF(Code- 30)
12. C7- 30pF(Code- 30)
13. C8- 0.1uF(Code- 104)
14. Inductor(L)- 0.1uH (5.5Turns coil).
15. Antenna- A short wire, 20cm long.
16. PCB
17. 9V battery terminal
18. AUX port/ jack
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Microwave gun: • Acura - ILX - Performa...
High voltage generator shown: • How to make an ARC LIG...
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Inquires: Hobcoman@gmail.com
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music: Wallpaper, Kevin Macleod
Licensed under Creative Commons: By Attribution 3.0
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Snapchat: keystonescience
Twitter: @Keyst0neScience
Facebook : / keystonescience 
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I was wearing a home made ring made when I happened to spill acid on my hand. Classic mistake.
One gentleman at work had a ring on his finger and happened to get in between a ground and the positive cable on a vehicle's battery, burning the flesh around that finger and others near.. quite a nasty scar, and quite the learning lesson!! Handled it like a champ!!
+corrosivecopper Sounds like a good time!
BEST RUclips CHANNEL
EVER
yes this is one of the best channels i have.. The "core" components you describe are of vast help to those trying to get into this field and i thank you for the time you spend to help us.
Seen this before, but nobody actually explained why it works, just how to make it. thank you very much keystone science. Good video.
This is a great style for your videos. I like the detail you went into on this project and the mini-tutorial in prototyping on a breadboard.
your content is helping me alot
i am currently learning about electronics and math as my main courses and electronics got kind of stale really fast
channels like yours make alot of people curious enough to invest time into the subject
great work keep it up :^))
This reminds me of being 10 years old building radio transceivers. Difficult crystal sets. 1980 was a great year in the uk for amateur radio/CB. keep up the great work. Just a tip slow down just a touch for us older ones.😃
Good job :) keep up the good work and that was a cool project i might try it when i get the parts i need. Your subs are growing exponentially you will get a silver play button in no time
Very neat. I subscribed to you a while back and have enjoyed your weekly videos! You have some great ideas!
If you're having trouble seeing the waveform of the oscillator on your scope, use the X10 setting on your scope probe. The X10 setting reduces the loading on your oscillator and will not only make it easier to see, it won't load down the oscillator and detune it as much.
Thanks for another great video. Cheers from Texas :)
It's depressing that i now have a playlist filled with a load of your videos which I want to attempt one day
Daniel O'brien - Just start gathering parts and making them. Once you have made a few, the rest will be easy. Just be VERY careful with the high voltage stuff, though. A simple mistake can cost you your life. Get comfortable with the low voltage stuff first.
You did a great job with this video and the FM Receiver one, because you explained how they work so well!!! :) There are lots of videos over here on RUclips about FM Transmitters and Receivers, but none of them make a scientific explanation and seem very odd!... :-S
Thank you ☺☺
i have been waiting for this episode for a long time
this channel is magical..... scientifically of course!!!😊😊😊
Heya, Keystone! Another fantastic video.
I was wondering what level of mathematics/physics/signal processing you've been through. I can't quite tell whether you know the equations or if you're finding them off of wikipedia or the like. If you are in fact recalling the equations from academic experience, I'd love to see a greater theoretical expansion of some of the circuit behavior! Thanks!
What gauge wire do you use for the coil inductor? I know those breadboards are fairly standard but don't recall what diameter wire off the shelf is right to use for them.
this guy half my age building his own transmitter and I can't even get my own Haynes 'build your own fm radio fun kit!' working.
Hey, I highly enjoy your videos. I would like to see you do a video on how to build a variable AC to DC power supply
As long as one knows which wire goes where, colour is not an issue. Plays true in a sense to people as well.. crazy situations in this world. Nonetheless, always extremely informative and very well vocally illustrated. I enjoy your intros, to sum up.. "Warning, This is potentially illegal, so let's get started'. Great ideas for projects. Again though, crossover network video perhaps?? Thank you Keystone Science!
So you asked for a few suggestions and there are a bunch of potentially cool things i think you could do. Peltier devices are really interesting and would probably make for a good video in some way if it piques your creative interests. Also I've gotten a liking for "lowtech hightech" projects where you cobble something awesome together.
But I've always wanted there to be a series where you go through a bunch of connected projects to slowly reveal a bigger project using the parts. Like if you came up with a 'post distaster survival guide' where you start rebuilding functionality, but with a slight bit of 'story' for creative flexibility. Maybe you need to bodge together a diy door number pad system that could use this fmTx to 'ring' the doorbell and announce who you are with a microphone or whatnot. I think it would be fun for you to make, as well as fun for the viewers to watch, and I know I'd be spending the limbo in between videos recreating the projects in the videos. This is a bit of a ramble but yeah, it'd be fun i think.
Question, how do you feed it stereo audio? I'm wanting to make a USB FM transmitter to send audio to my home stereo and don't want to complicate it with Bluetooth. I have a USB DAC from a damaged headset, and would like to build the FM transmitter onto that using this how to, but there isn't stereo included in this, unless I missed it.
Does a microfone of cellphone's headset (I'm not sure if I'm using the correct word) work connect directly to audio jack?
how can i solve the narrow band problem? it works but it only transmits signals below 1KHz
great video overall with good demonstration of breadboard connections.i tried successfully to make the transmitter. the only thing i didn't like about the video was lack of information about how to locate the frequency on the fm receiver.
did it worked?? are u able to really transmit the fm wave
awesome as always! big thumbs up❤
This Chanel should have more subscribers it great!
Isn't the sleeve of the TRS connector the ground? I thought it went Right, Left, Ground from tip to sleeve?
Just looked it up and apparently older Nokias and Samsungs have it the way you mention in the video. I actually like that pinout more as the ground is probably the first thing to make contact with the receptacle.
What if use different capacitor values? How will it affect in the end ?
Is a BC547 instead of the S9018 working, too?
I have a doubt, can we use tunable capacitors in microfarad ranges so as to get lower frequency ranges ?
Great build.
Keep it up!
what adaptions need to be made to hook this up to the 12v cig laighter of my truck?
Great Video as usually though! Great job man!
After watching your videos I came to a very simple conclusion. I need a garage T_T
Yes T>T
I just subscribed after watching that. Brilliant. 👍👍
That trick to wind the inductor with the screw threads is genius!
Really cool man thank you.
love you work
too much of good information
Can bc547 be used instead of that transistor please reply
Where do you buy your circuitry components?
I am unable to find 30pf-120pf variable capacitor, what I am able to find is 2-22pf and a 5-27pf. Help out.
Hey so can somebody help me out. I'm trying to build this, but I just can't get it to work. I think it may be partly because of my variable capacitor. It is a 45pF-280pF variable capacitor, will that work? Please let me know, any help would be appreciated.
You, sir, are a genius.
Very informative.
Thanks.!
Sir,I was really overwhelmed by the video.
It was really cool.
I do had one more request.
Can you make another video on how can we make our own audio amplifier?
Actually there are many sites all over the internet which provide us with circuits diagrams and tutorials on how can you make it.
But frankly speaking I didn't like anyone one of them and also I tried making the circuit thrice as per the sites but it didn't worked as I thought it should.
Do you think you can help me with it???
can i use BC547 or 2N3904 transistor instead of that transistor what is used here???
nice video, sir! But i would like to know what diameter the screw has...
Is there any replacement for 680pf capacitor?
Would the signal be available on our mobile radio?
Which transistor have you used? Please reply
Av just learnt a hell lot. Thanks Man :-D :-)
Loved it!
Crystal radio video for sure! Explain what the coil length has to do with frequency. Also what the diode does, what a cat whisker is and does. (If you using that) etc etc - Id love to see this indeed!
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Wow!
Have you thought about an ion thruster?
And also, have you been able to make any progress on the Tesla gun?
your vids are wicked!
Best channel for ever
What is the frequency in the radio for this? Thankss
awesome video bro 🙂
Sir what is the maximum range of your FM transmitter
can i have the link to the circuit diagram
How do you change the transmission frequency
I have already build my own fm transmitter, but unfortunately the frequency wasn't stable :(
Could you plz make an video about how to make an video transmitter? :)
Also talk about generating FM modulated signal in either multism or Proteus.
Do you use insulated(Enameled) or uninsulated copper wire? And with the variable capacitor, is its type a polarised or non polarised
Jack Beeby - You can enameled wire, or you can use bare wire as long as the turns don't touch. Small trimmer capacitors, like the one he used, are not polarized. If you are using a variable capacitor, such as the ones in old radios, you have to keep in mind that one side of the capacitor is typically connected to the frame and, in that case, it will matter which way it is connected.
i'm having a hard time understanding how the 10 pF provides positive feedback , like how does it presence cause the oscillations to continue
I didn't understand it but I still enjoyed it!
Big thumbs up to your parents for raising such a model citizen.
Hey what's the guage of the wire and diameter of the screw?
good project . i make this. But you show working of fm in a good way.
Can I use more power to extend range. Like 2 or 3 9V batteries? Or would I have to increase/decrease cpacitance and resistance of capacitors and resistors?
make the antenna wire longer, make a ground plane base and attach an earth ground. You can look online at any of the ham radio antenna DIY building info and get some knowledge on all this and simply apply it to the FM band instead of Ham bands.
Awesome project! I have a question though, Can you do illegal activity by broadcasting a message out loud in certain regions? but lets not worry about that cool project. 😎
can you make one that can broadcast in all radio channels?
What's the maximum range of this circuit?
cheers man! but just a quick question ,does increasing the power input to the reciever increase the signal range.
No to get more range you will need to tune the antenna itself to the operating frequency of the transmitter. You can change out the transistor from a GP (general purpose) NPN to an actual RF power transistor rated at like 5 watts and up to 200 MHz. I have experimented with all this years ago and I used old CB radio power transistors and they work but they cut off at typically 100 MHz, The power transistors out of old VHF Hi band 2-wat radios work though because most of those transistors have a broad range like 30 - 300 MHz or something of the sort. Those are the round white 4 tab ones with aLOT of solder. also of course you will also have to make modifications and adjustments to the circuit in the video to handle the power and maintain resonance / stability, heatsink the transistor and you will need more than a 9V battery also. Something in the nature of 12 VDC @ 2 amps at least for a 1 watt transmitter.. You want to keep your power under 1 watt and frequency below 92 MHz in the US to use without a license though.. There are diagrams online for higher power FM circuits though that may be easier to go by.
If I wanted to reduce the range, would it suffice to reduce the supply voltage (to say 3V or 4.5V), and adjust the circuit's equivalent resistance accordingly?
yep!
I'm very curious about the relationship between the induction coil and the capacitor. If you increase the size of the capacitor how must the coil change to give you the same frequency? radius? length? gauge?
Christopher Weston I think there is a formula for that
good stuff man
very niz job dear, i which u do it without pbc board so it will looks so comprehensible
I have just found your channel and subscribed when I was watching your taser and EMP videos I know you're sharing what you know as you're very clever but it is a little hard to follow when you talk so fast as I am just starting to go down your films today and I would like to copy some of your projects in the future. I've always been interested in science as I like to make quite a few things myself but that's normally with wood or steel my channels Simon Outdoors by the way it's mainly bushcraft and Fire lighting but I have thought about doing different channels like science and survival but like some of your inventions not everything is legal everywhere and I would like to share what I know without getting into trouble.
Hey- cool video. If I want to change the frequency up to ~315 MHz would I just need to change the inductance and capacitance at the points you used in the equation or would the rest of the circuit need to be modified as well? Thanks!
315 is illegal to tx on
How many meters can I transmite by it
Nice! can you show how to make transmitter and reciver for example rc car ?
can you make some videos about super capacitor(home made)
nice.
still beyond my understanding.
but it definitely cleared up some things.
i'll be back some day for more clarity lol.
It looks real professional when you scribble on the circuit diagram
great vids. you could make a fm reciever to go with thr transmitter.
did anyone make this circuit on proteus or any other software?
Great channel, subscribed :) You look a lot like Tom Holland, the new Spider-Man, by the way! Keep up the fascinating work
+Edmund Celis haha thanks xD
can you tell us how digital radio works
What is the range ?🤔
Hey, can you build a home welder with a couple of microwave oven transformers?
Whats the range of this thing ?
I have been following along and found it very hard he keeps on adding things of camera
Thanks
But how long distance
smart yet not boring
is there any other option for trimmer cap i cant find it
You can make one, make a capacitor where the plates can be moved so that the capacitance can be changed easily. I’ll make a video on how to make a simple one of these soon.
You forgot to mention to scrape the ends off the coil; must have enamel on the outside of the copper..
Also @4:25 inductor is missing
to easily measure the inductance of the coil just plug in your known capacitance and the measured frequency
The 30pF cap in series with the antenna is for decoupling so the antenna wire has low effect on the resonance however the antenna wire should be cut to length to match the desired frequency for best results. also you can legally operate up to 1 watt? on FM band between 87 - 92 MHz without a license as this is the non commercial part of the band. 92 - 107.9 is the commercial part and you are limited to I think 10 mW or something stupid low power... However even in the non commercial section anything over 1 watt to 1 KW I think requires an LPFM (Low Power FM) license and good luck getting that without being backed by a corperate media group or you have a pile of lottery money..
You really should use enamled wire for the inductor also