Build A Long Range FM Transmitter (Homebrew Radio Station)
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- Опубликовано: 12 июл 2014
- Have you ever wanted to broadcast your own radio station within the neighborhood? Ever get curious on where people get those "Surveillance Bugs" from spy and action movies? This small and simple FM transmitter is the toy that geeks have always wanted.
FM transmitters can be complicated to build, that's why I'm teaching you how to make a foolproof FM transmitter. There's no need to buy kits, this tutorial includes the PCB layout and the schematics.
Download: drive.google.com/file/d/0BwP5...
Full Tutorial: www.instructables.com/id/The-U...
Specs:
- 1/4 Mile Radius Range
- Powered By A 9V Battery
- Lasts For Several Days
- Adjustable 87-108mHz 
Наука
Amazing how things don't change. I built something like this in the 70's. I would recommend testing before hot gluing.
Henry Pitts Yes! My grandpa said the same thing. I guess this circuit is considered as one of the classics. :) Good idea on the test it first.
@@TechBuilder Basic concepts that never change. Thank you for putting this up here. I really enjoyed watching your video and this helps as a refresher for me. Great job! (And yes, I'm chiming in very late here. 😏)
@@TechBuilderwhat's battery life
@@religionisapoison2413 I was curious about that too, it might be a nice feature to be able to decrease gain to be just enough to meet our needs, if it saves battery power.
@@mscir yeah, was thinking about deploying units to homeless camps to a central repeater. The unit itself would have virtually zero street value other and the repeater would be up in a tree or on a bridge somewhere with main battery. If it was possible to have long battery life you could manage a lot of camps at once and ensure safety when those persons don't have access to phones and are posted up in the woods somewhere. Thought about solar loRa mesh but those would have street value.
My goodness it's fun to see kids do this. I've done this (probably exact same schematic when I see the parts) back in 1987.
Really cool seeing this again. You can even boost the power (and thus range) by using a 12V battery I don't know the specs of these transistors but the once I used back in 1987 actually go up to 30V.
Most are limited to 9V
I built this kind of thing back in college in 2004 as a final project. My team was the first ones to use wireless successfully in a final project, our idea was to use it to locate your keys when you lost them. Have a transmitter in a central location and a small, low power FM radio on your keychain.
Wish I had this video back then, most of our time was spent researching and circuit building then starting over when the circuit didn't work right. Well done.
Thank you for this video. I have built this and it works perfectly. You were a better teacher than most of my university lecturers.
That hobo way to get a 9v clip was genious!
+ET I know right, I can't believe that I had never thought of that before
+ET +runforitman I've actually purchased 9v battery clips, while all along I've been discarding them along with the 9v batteries to which they are attached. I never thought of this part as being retrievable, before watching this excellent tutorial.
+runforitman I've been doing that since I was like 10 lmao
+Random_rapper20 I've done it since I was 6 years old
Tyler Mcnee woah not a competition lmao
You have some really well presented videos. Subscribed.
amazing ....
oh man the boss comment.
BTW he is a filipino.
BroBoard! Who fucking cares about the origin of ancestors?
@@l3p3 I do dumbass.
That's a verified checkmark...
This'd be cool for the next Paranormal Activity movie. Hearing the ghost's voice from a mile away with your friends sounds awesome.
I remember making one of these just to jam my neighbor's loud fm stereo. Instead of using trimmer cap, I used the one from an old am radio, the plastic type variable cap for ease of tuning. Removed the mic and replace it with a female phone jack so I could input various noise making gadgets in it XD
Great way to get the FCC involved. Intentionally causing interference. LOL
The Linux Guy 88 , lol...
+The Linux Guy 88 We don't have FCC here, but we do have NTC which don't give a crap on low power transmitters lol
Are you real?
rohan madane i ask myself that everyday
You can change the tuning range of the transmitter by reducing or increasing the number of turns in the coil. To raise the tuning range above 108, simply use fewer turns and you can use audio of TV channel 7-12 on an analog TV set or a "police scanner" as a receiver, or increase the number of turns for TV channel 2-6.
you should rename the video "How to get your door kicked in by the FCC for less than 10 dollars"
7h3 m057 4u71571c y0u7u83 Ch4n37 3v3r , Funny!!.., but so true!!...
7h3 m057 4u71571c y0u7u83 Ch4n37 3v3r xD i like your channel name ahahahahahahahahahah
is that really how it works?
no
Isn't this covered under Part 15 (low-power transmitter on the FM frequency band with range of less than 61 meters)?
Here's the reference: www.fcc.gov/media/radio/low-power-radio-general-information
I love how you played Kalimbia the entire time!!! That song is one of my favorites!
i have built one and it works and surprisingly mine sounded even clearer than yours, every word of the transmitted music is easily recognised up to about 15 meters , thanks a lot man !
"It wouldn't hurt to add more, so... I added more."
I Chuckled.
Simple, clear directions. Well done!
Is there a way to use lower voltages with this transmitter? Such as switching resistor values or something like that? Thanks in advance.
The first transistor is an audio pre-amplifier and the second one is a VFO and this is the simplest mode ever from 80's, but we consider this oscillator unstable.
I have made too many projects in 90's starting with 7 watts transmitters till 60 watts using the PLL technology which is very stable and used in all Tranceivers.
Best memories ever in my life.
I build the similar device as a kid almost at the same age when you did this, in the early 2000's...nice to see someone with the same interest.
Old is gold. anyone didn't teach me how to make pcb, thanks bro
What is this 2014 or somethi-
That's what a call a bright kid! Since this video is kinda old I just checked and realised you stopped making videos some time ago. You really shouldn't. You are awesome!
Watching this in 2019...no more Radio Shack.
@Ryan Sanborn i have a "raidioshack" here where i live,it is just a electronics store with the radio shack licensing
wait what but i still see it in Cairo festival mall
2021 now
My favourite transmitter. I used for Q2 2N3553 , L1 five turns or on board ,R7 100ohm (that one need Wattage), and distance would be several km
As soon as he started prying open that battery the like button was instantly clicked
Lol
+Christopher Jones i just read the tittle and subscribe
+MrYOUsuckcorp I've been subbed since this came out
Noice
You realise you can get the 9v clips for less than a dollar, right?
That was very clever the way u made ur own printed circuit board like that. So that 9volt battery provided enough power to drown out the broadcast station in the vicinity of ur house-awesome!
I used to build his things when I was a teenager like you. But I used to make the antennas a lot longer than that. At one time I ended up bugging my sister’s House across the street about four houses down. What I did was I hooked up the antenna to the copper strip that seals the front door sometimes front doors have a copper strip around them to keep the air from coming in and out. And it worked flawlessly
Nice job, excellent video. Good enough to rival the videos of some professionals I've seen.
I remember building a circuit similar to this decades ago. The frequency is very unstable. Simply moving your hand next to the circuit or antenna changes the frequency. The range is good enough for the house. These days you can buy digitally tuned, stable frequency with LCD frequency display, FM stereo transmitters for under US$5 and a simple modification can increase their power into illegal range.
Can you be more specific, I’m interested
hello i need a little help regarding this. if i use 3906 npn transistor instead of 3904 what capacitors and resistors do i change in order to make it work?
does this transmitter have to have a receiver somewhere around or can it actually just transmit sounds like voices radio station is things that are coming from your computer into the air and be picked up into someone's house can actually focus on the individual area
Wow! Very neat and professional!can't wait for 2nd week!
can I place an audio jack instead of the mic. to connect an mp3 player for example
Yes
Afcourse
Yes you can. I did that around 20 years ago and would carry my Sony Walkman around neighborhood to check the range. I used to put the channel near existing FM stations. It was fun.
What video should i look for to build a device that i can hide, and it makes sounds using my phone, such as pre recording sayings or ghost noises. I want to build a better scar a thon device. Thanks
Hey just wondering, can you transmit an audio signal from a microphone using an NRF24L01 module to another one with a speaker?
crap they shut down all the radio shacks lol
you can still buy the stuff from their website (or, if your lucky, there are still some stores in larger cities)
Brit Johnson There's a Radio Shack in Woodfield Mall.
RS sucks in the past decade. Use to be the place for parts. They died from the net
Yea, You can salvage all this junk from an old VCR some one threw in the dumster. Most of my part are salvaged. Just remember as a kid RS has everything and then some you needed to build something. THey were killed from the net.
+larry caine Their staff also had no clue what parts they sold. They were all deadset on phones, cell phones, and lost their base customers.
Really well edited video and good content. I am a little confused as to how this transmits FM waves versus producing AM waves. What in this setup is actually doing the frequency modulation?
I was wondering how you were getting sound to the transmitter, then I noticed the mic. Makes sense now. Nice project.
could I change the electret mic with the 3,5 mm aux input audio from my laptop?
I totally wanted to build mini fm transmitters like this from kits in the back of popular science as a kid to spy on people. The ones I really wanted were expensive (and tiny), but I did build a slightly larger one (about the size of a travel toothbrush holder). I left it in the room with my parents a few times and went into the other room to listen on my walkman and spy on what they were saying, but it was never interesting.
nasty🤣
Great video ,keep them coming . Could i ask how would you use the multimeter to tune the transmitter
Can I use two 10pF capacitors in series instead of 4pF capacitor? Please reply (Sorry for my english)
is it picking up the sound (vibrations) from the speaker and then transmitting it to fm or how is he getting the song to be transmitted? there's no aux chord plugged in or is there?
Amazing, I cannot wait until I build up the confidence to leave the bread board. Once I have the confidence in my skills I will definitely be making one of these.
d74g0n start today. confidence will follow. doesn't even matter if you wreck it. besides, its actually so much simpler & easier this way. (with a pcb as opposed to a breadboard, that is)
+d74g0n there's a middle ground between the DIY etched board he made in this vid and breadboards. For something this small and simple you just need a generic little protoboard and solder connections together as needed. You'll have more practice with soldering that way, too, so by the time you spend hours making your own board like he did, you won't immediately destroy it
I'm still curious how to make it work with a greater power source.
+tjtube263 More Batteries in parallel. Or what are you talking about?
Christopher Kidd Sort of, yeah. I imagine it's more complicated than simply using a bigger power source, though.. Right? Won't the resistor values etc. need changing and so on?
I don't find 40pf or 20pf trimmer cap
I find 33pf fixed with 0.1uH then what's the frequency broadcasting??
1/2π√LC
Hello, I wanted to know if it matters if you move the frequency channel? The thing is that on the bus they put a station with a very bad music, and I wanted to use this to change the music a bit on my tour. Can I connect this device directly to my cell phone so that I can play the music I want? Thank you!
i know it might sound dumb since i don't know have any knowledge, but if we somehow wired the antena to a metal pole would that pole act as an extension of the antena?
Congratulaciones, you're just a Child, but a genius Child!!! Thank you for your videos that are, amazing!!
A greetings from Uruguay! You have my " like"
A bit complicated for my brain, but very cool!
Ну ещё бы, ты же тупой как пробка!
What are all the parts has to be changed to transmit like 200 MHz ?
(To use this for wireless mic receivers)
Awesome Job!! I have a couple of Nephews I'm trying to get Excited about Science/Electronics and I think after watching this, They'll be wanting to build one for themselves!! Thank You for the Downloadable PCB Layout!! Sincerely, JeffQ
BC 107 or BC 109 metal body transistor will help to get more range
I like the way you made the coil, Genius ! :)
How many the power of résistans
is it possible with an FM transmitter other device to transmit my voice to my friends FM radio in his car if he parks close to me and can I do it with more than one friend at a time and their car also
can u tell me what im doing wrgon iv built it exactly as per diagram but just carnt get it working
That WinRar is paid version? :p
P Ravikant Nope, it's the trial.
I would rather use the legal trial version. :)
TechBuilder do u mind making a video about A/V transmitter
MegaMidoZ If I can find a good working schematic then yes!
TechBuilder i find a good one but i cant find some component in the circuit
www.radio-circuits.com/transmit8.htm
22pF trimmer is not available near where i live
Can i use aux input instead of a mic?
Or does someone else have a great tutorial on that?
it would be possible, you would have to convert the stereo output (left/right) from a headphone jack to mono (single line), connect the positive of the now single output to the positive of the microphone connection, and the outputs negative to the negative of the microphone connection. just dont turn up the device that its connected to up very loud, as it can and likely will cause distortion, if it is to quiet turn up the volume on the radio itself
Yes
Could 2n2904 and 2n5041 be replacement for listed transistor, because those are only one atm near my town? And can I use adapter plug(9v, 150mA) instead of battery?
Thanks in advance, mate.
I have a project and it is a fm transmitter. the materials you used are common but the #18 wire is not available on any of electronics shop I went. what would you sugggest? how about #22? how many turns?
Really well-done video man!
cool
hey, man... your resonate tank frequency band is in range of 2.5 MHz to 8 MHz... how did you manage to catch 87 MHz signal on your FM radio ? :D
No brother..... From my calculations, the resonate tank frequency is around 79.61 MHz~approx 80 MHz
How did he connect the audio from the computer to the transmitter?
Hi, I made one by seeing your video but accidentally I provided opposite polarity (Vcc - Gnd) to the circuit. Can some components get burn? If Yes, which components I need to get replace?
great work! thank you! with 2 caps 10uf in parallel instead of the trimmer i broadcast with some noise on 108.5.
anyone knows how i could eliminate the noise and make it more sensitive? at the moment i can't broadcoast if i'm 2 meters away from the mic but i would like to have bigger range if possible... would that be just a matter of mic's quality?
Instead of the microphone, connect a headphone jack (maybe need a amplifyer), and connect to your phone. Nie u van connect your phone with car radio ^.^
I have worked like this circuit since 40 years ago and it was coverong a distance of 5 km by used a 3 transitor type 2N 3866
Have schematic?
Hello! Thanks for the awesome project!
is it possible to modify it so, instead of a microphone, it has a stereo output? Thank you!
If I wanted to increase the range so it could go through solid concrete wall a little bit further would I increase the length of the antenna / increase width of antenna?
What happen if I set it at no-free frequency?
MoNkey'S HuE the two sourses will meshu up and you will hear strange noises
One thing to note is that the diagram in the download file that shows where the components go on the custom PCB is missing the 4pf capacitor.
will i able to use this transmitter for controlling drone at 2.4ghz frequency? +Techbuilder
what is the maximum range that you have achieved with this circuit so far?
Can I use a BC547 instead of 2n3904? Works the same?
MAERSK try it
Should work
what about bd135?
Is it possible to have it go over all the frequencies to stop other people from listening to regular radio and only be able to listen to spotify from my phone for 50/100 miles???
I think so but you'd have to have a massive broadcasting tower and energy to overtone it.
I'm not an expert and that's just my Theorie
That's where it gets illegal. The FCC Part 15 rule is voided if you go over a licenced frequency.
Hi... If I was to model am FM receiver to receive the above signal, can you please help me with its circuit diagram.
Do we have to print the PCB layout given on a letter size paper with predefined size
Wow, how old are you? Because this is actually a pretty awesome project! Seriously the whole video was very professional and the project seems awesome. You could have a real future in the tech industry.
I'm 16 :))
TechBuilder Keep it up buddy!
The next nikola tesla
TechBuilder Nice, did you make that circuit?
Can I use two 10pF capacitors in series instead of 4pF capacitor? Please reply (Sorry for my english)
what if i want auxiliary input instead of the mic?
Soldier the negative and positive from the mic to an aux cord -_-
+sami aklilu than you can pirate radio XD
can i use an arduino/rpi to catch how distant the transmitter is (basically using several of them as beacons to mark a certain area of land)
hi, I didn't understand much with the placement of components on the custom PCB, Could you give me a pattern equal to the first shown in the video, but with the components you used?
Can we just replace the mic with mono phone plug?
yes, its the same type of signal, but a headphone output is usually amplified.
Hello. I am writing from Ukraine, but you are so clearly explained that I, too, will produce a bug .Ty took very good video. I write myself through Google translator. Thank you.
Радиолюбитель Максим lol
Радиолюбитель Максим Your sentence was very entertaining,hilarious to be honest,but hey,good luck man,you made my day :D
Радиолюбитель Максим Stop killing people in Donbass.
ltschriscrucker if I could.It does not depend on me
+ltschriscrucker wrong number dude, tell it to idiots and sellswords in Donbas. Someone is using a "palestine scenario" there.... free beheaders and child molesters stuff.. you know...
looking on the transistor flat side facing me - it's EBC from left to right. some pinouts are CBE. mine are EBC but looking on the pictures compared to the schematics it looks like those in the project are CBE. please help. can't tune it. the i've soldered it there's voltage between collector and emitter. can't find it on sdr.
3:43 UFO! they're back.
Welgodvergetengrafkankertering. Net doend of ik Julie it's her head an maar godverdomme ophouden!Wat juice eropsl
Its free energy
Really, I hope is every week, that will be cool
What u think about using jack 3.5 input instead of mic? is it possible?
hi...I want to make mine too ..but I can't find ceramic trimmer capacitor what can i use to be able to work on it
How to play porn sounds through the radio at your local low budget store that uses a standard radio.
Holy shit. Never thought of that, you can really mess with people listening to radio 😂
@@Niko-gr3yo I don't want to destroy your party but it's illegal to interrupt radio in public areas.
It's not as if anyone would find out, imagine how unlucky someone would have to be to get caught.
You can do it at any school or place that uses fm radios or walkie talkies
@@Uhohspaghetti0ss with apple watch walkie talkies?
nice
Hello, how many radios in simultaneous do you think you can hear, all in a very close area, the same room?
Can i use a 30pf trim cap instead of the yellow one in your project?
What kind of battery life could we expect to achieve with a 9v?
3-7 days :D
***** It lasts, longer than you think :))
Interesting, wouldn't have expected that kind of life from something like this.
+TechBuilder I watched a video from Keystone Science on how to make one and his was using 6.2 amps I think and it registerd 0.00 usage even with it on.
Depends on how much current the circuit is using overall, the more current the faster the energy is being drained out of the battery.
Smart kid! I remember seeing you in Philippines news. Keep it up bro!
Thanks!
TechBuilder can you solder a aux jack instead of a mic and get a clearer sound
slinky211 Yes, just solder it to U1's collector pin. Please visit the link for more detailed instructions.
What do you mean by U1??
Hey techie, can please tell how to redesign it with 3.5 mm jack. What modifications shud be done to achieve it?
can I use the radio application of my cellphone to listen the transmited voice?? and....how to connect the bug with the radio
Hey mate!
This is a really impressive project and a well made video.
How long does one battery last?
The part that is educational happens when you explain how the components make a transmitter.
can i increase the range by using more efficient antenna and also can i use an 3.5 audio jack instead of mic? pls reply
did you rescaled your printed version? when i print it, it looks so small, so hard to solder
I remember you from the google science fair
no you don't
@@realcartoongirl wow thats rude
At what frequency does it transmitts fm
It transmitts on all frequencies as he said.
depends on what the variable capacitor is set to
Will it work if I use 70pF trimmer capacitor instead of 40 because there is no 40pF version in Turkey
Your capacitor values in your schematic and images are different. What to follow? Or I can choose any ?
The PERFECT rickroll device :D