Build A Long Range FM Transmitter (Homebrew Radio Station)

[@Henpitts]

Amazing how things don't change. I built something like this in the 70's. I would recommend testing before hot gluing.

[@TechBuilder]

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.

[@dang48]

@@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. 😏)

[@Atheism-And-Normative-Ethics]

​@@TechBuilderwhat's battery life

[@mscir]

@@Atheism-And-Normative-Ethics 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.

[@Atheism-And-Normative-Ethics]

@@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.

[@rdoetjes]

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.

[@zeref783]

Most are limited to 9V

[@Strongit]

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.

[@DAN985]

Thank you for this video. I have built this and it works perfectly. You were a better teacher than most of my university lecturers.

[@anu_start]

you should rename the video "How to get your door kicked in by the FCC for less than 10 dollars"

[@WhitemenaresoSexy]

7h3 m057 4u71571c y0u7u83 Ch4n37 3v3r , Funny!!.., but so true!!...

[@Hackanhacker]

7h3 m057 4u71571c y0u7u83 Ch4n37 3v3r xD i like your channel name ahahahahahahahahahah

[@TheGreatUtopiaCat]

is that really how it works?

[@danijeldan5360]

no

[@LMF5000]

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

[@Afrotechmods]

You have some really well presented videos. Subscribed.

[@ofentsetshepe]

amazing ....

[@broboard9658]

oh man the boss comment. BTW he is a filipino.

[@l3p3]

BroBoard! Who fucking cares about the origin of ancestors?

[@crappyatlife]

@@l3p3 I do dumbass.

[@Dubswitcher]

That's a verified checkmark...

[@ET_AYY_LMAO]

That hobo way to get a 9v clip was genious!

[@runforitman]

+ET I know right, I can't believe that I had never thought of that before

[@HiwattGuitarsDDR]

+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.

[@blackbird1234100]

+runforitman I've been doing that since I was like 10 lmao

[@tylermcnee9441]

+Random_rapper20 I've done it since I was 6 years old

[@blackbird1234100]

Tyler Mcnee woah not a competition lmao

[@LittleWolfBindery]

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.

[@MeastrasElKachelino]

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.

[@youssefabdulmuti9854]

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.

[@cemomaher1650]

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

[@renekenshin6573]

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

[@TheLinuxGuy88]

Great way to get the FCC involved. Intentionally causing interference. LOL

[@WhitemenaresoSexy]

The Linux Guy 88 , lol...

[@renekenshin6573]

+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

[@rohanmadane8774]

Are you real?

[@dolendoge1611]

rohan madane i ask myself that everyday

[@mayura4718]

Old is gold. anyone didn't teach me how to make pcb, thanks bro

[@arjuhama]

This'd be cool for the next Paranormal Activity movie. Hearing the ghost's voice from a mile away with your friends sounds awesome.

[@cbxk1xg]

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!

[@hapybrian]

"It wouldn't hurt to add more, so... I added more." I Chuckled. Simple, clear directions. Well done!

[@scottc346]

Watching this in 2019...no more Radio Shack.

[@trentselectronix837]

@Ryan Sanborn i have a "raidioshack" here where i live,it is just a electronics store with the radio shack licensing

[@big_o1952]

wait what but i still see it in Cairo festival mall

[@V0R73X]

2021 now

[@xxxlee67xxxx]

crap they shut down all the radio shacks lol

[@britjohnson4478]

you can still buy the stuff from their website (or, if your lucky, there are still some stores in larger cities)

[@mcdonnelldouglasmd-1184]

Brit Johnson There's a Radio Shack in Woodfield Mall.

[@larrycaine6673]

RS sucks in the past decade. Use to be the place for parts. They died from the net

[@larrycaine6673]

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.

[@TheLionAndTheLamb777]

+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.

[@emmanuelmuganza3426]

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 !

[@charliebrownn6622]

With the threat of nuclear war stronger than ever, this is valuable knowledge for building basic radios! You should cover more of these topics! Felicidades! Congratulations !

[@metricmine]

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.

[@speedyL70]

Can you be more specific, I’m interested

[@pramodravikant3047]

That WinRar is paid version? :p

[@TechBuilder]

P Ravikant Nope, it's the trial.

[@TechBuilder]

I would rather use the legal trial version. :)

[@MegaMidoZ]

TechBuilder do u mind making a video about A/V transmitter

[@TechBuilder]

MegaMidoZ If I can find a good working schematic then yes!

[@MegaMidoZ]

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

[@OsamaAlsaiari]

can I place an audio jack instead of the mic. to connect an mp3 player for example

[@poorboy5wagpoorboy5wag77]

Yes

[@madhuradharme9131]

Afcourse

[@itsourlife]

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.

[@potat._.1]

@@itsourlife When replacing it with a headphone jack, do I need an amplifier for it? Or should I just straight up replace the mic with a headphone jack?

[@itsourlife]

@@potat._.1 Amplification isn't needed as the output for headphones is very high meant for low impedance loads. Just a parallel resistance and a capacitor would do. You might need a resistance and capacitor parallel to it too. You can try directly as well but remember to start with zero volume onwards.

[@msayed6189]

You remind me by this fucking moment, when I was young (15 years old) & built a transmitter.. after several tries and hard working it worked successfully.. I was soooooo fucking happy with it and was "playing" with it all the next day since I woke up.. at the evening the same day cops were in front of the door !!!!!! It was a black day and gray days after I won't forget.

[@ricecooker3k]

how the heck does the police get you when your fm range is only 400 meters? what the hell

[@johnishikawa2200]

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!

[@aaronsood8594]

What is this 2014 or somethi-

[@AlexVHS-1]

“10 years ago”

[@mirrezwanyt]

Is, Lol.

[@ChristopherJones16]

As soon as he started prying open that battery the like button was instantly clicked

[@tylermcnee9441]

Lol

[@mrhacktuber2657]

+Christopher Jones i just read the tittle and subscribe

[@tylermcnee9441]

+MrYOUsuckcorp I've been subbed since this came out

[@Kamal_AL-Hinai]

Noice

[@andreyrumming6842]

You realise you can get the 9v clips for less than a dollar, right?

[@MrRJ2K10]

Smart kid! I remember seeing you in Philippines news. Keep it up bro!

[@TechBuilder]

Thanks!

[@slinky211]

TechBuilder can you solder a aux jack instead of a mic and get a clearer sound

[@TechBuilder]

slinky211 Yes, just solder it to U1's collector pin. Please visit the link for more detailed instructions.

[@jbdawinna]

What do you mean by U1??

[@IDK123LOL]

I built this on a breadboard in 2017 for a uni project and it was the greatest thing I ever made after it worked

[@aaarod75]

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

[@CamdenBloke]

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.

[@neerajnarwal9558]

nasty🤣

[@anwarozr82]

BC 107 or BC 109 metal body transistor will help to get more range

[@MrStickman3000]

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 ^.^

[@ICanCreateAk]

Can I use a copper wire instead of solid wire

[@mcc-us]

Awesome video, Let's see more!

[@theredlabcoat]

Nice job, excellent video. Good enough to rival the videos of some professionals I've seen.

[@UkrainianBazooka]

How to play porn sounds through the radio at your local low budget store that uses a standard radio.

[@Niko-gr3yo]

Holy shit. Never thought of that, you can really mess with people listening to radio 😂

[@TheFrostSnowball]

@@Niko-gr3yo I don't want to destroy your party but it's illegal to interrupt radio in public areas.

[@RetroPlus]

It's not as if anyone would find out, imagine how unlucky someone would have to be to get caught.

[@Uhohspaghetti0ss]

You can do it at any school or place that uses fm radios or walkie talkies

[@pixeiatedsan5609]

@@Uhohspaghetti0ss with apple watch walkie talkies?

[@РадиолюбительМаксим]

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.

[@JohnyPaprikas]

Радиолюбитель Максим lol

[@weezyntifan]

Радиолюбитель Максим Your sentence was very entertaining,hilarious to be honest,but hey,good luck man,you made my day :D

[@ltschriscrucker]

Радиолюбитель Максим Stop killing people in Donbass.

[@РадиолюбительМаксим]

ltschriscrucker if I could.It does not depend on me

[@Geroskop]

+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...

[@jffqnn]

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

[@adamreese8076]

THIS MAN SAID "HEAD OVER TO RADIO SHACK"?! 😂😂😂 NOW THAT’S PRETTY FUNNY

[@TechBuilder]

Gone are the days 😭

[@JaviBLENDer]

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"

[@abasahmed]

I like the way you made the coil, Genius ! :)

[@malekpro1805]

How many the power of résistans

[@d74g0n]

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.

[@tjtube263]

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)

[@IchitheLover]

+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

[@tjtube263]

I'm still curious how to make it work with a greater power source.

[@poorkidd]

+tjtube263 More Batteries in parallel. Or what are you talking about?

[@tjtube263]

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?

[@richardbowers3647]

1960s METAL DETECTOR KIT (variable FM.) This assemble yourself kit included all electronic parts, but no FM radio nor coil (loop.) The entire package was mounted on a long flat board with FM radio, boxed assembled kit, & added detector loop. It worked! The electronic parts came in a paper envelope, not a box.Here it is 12/6/2019 & has been saved indoors all this time! How about that? Thought you'd like to know?

[@Reelmoana]

You can be the DJ of your neighbourhood 💙. This is amazing

[@Duskryn]

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.

[@TechBuilder]

I'm 16 :))

[@Duskryn]

TechBuilder Keep it up buddy!

[@akshatsingh7231]

The next nikola tesla

[@AB-cf4zc]

TechBuilder Nice, did you make that circuit?

[@matteoZattera]

Can I use two 10pF capacitors in series instead of 4pF capacitor? Please reply (Sorry for my english)

[@OpticalLimit]

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?

[@tonyanderson2809]

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

[@erikpratama320]

Have schematic?

[@k1j1j1j]

I love how you played Kalimbia the entire time!!! That song is one of my favorites!

[@dang48]

I have some projects planned for the new year and I believe I may just incorporate this one into one or two of those projects. Back to the drawing board. And yes, I've seen this before in magazines during the 70s and 80s. One of my teachers built a baby monitor using a transmitter during the 60s and he built a few more for his wife's friends when they were impressed with it. Unfortunately, the frequency was a tad off and the local police station was getting signals on their frequency. He had to round up all the units and dismantle them or he would have faced charges. I can still hear him chuckling with an amused look on his face while he told us about this.

[@nathanmead140]

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???

[@ZLP-TM]

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

[@thatziggs4062]

That's where it gets illegal. The FCC Part 15 rule is voided if you go over a licenced frequency.

[@unnamed715]

Now I can see if my friends are talking shit about me when I leave the room. Thanks!

[@shutdahellup69420]

Lmao

[@cristiancazacu9771]

Jcsvuycygyycvxtg xc ju knkfkm!fvkjjukkjn!ngnmjumjkj!nkloini.Y Kiljhjdjvju!,?mnl

[@unnamed715]

@@cristiancazacu9771 Wtf kind of Elsa gate bullshit is this???

[@cosmiccheetah6906]

A bit complicated for my brain, but very cool!

[@olegkotletov7857]

Ну ещё бы, ты же тупой как пробка!

[@guy_chillin2406]

I was wondering how you were getting sound to the transmitter, then I noticed the mic. Makes sense now. Nice project.

[@RandomLearner]

Thank You, buddy. I just have passed my electronics project course by this video.

[@lancelotxavier9084]

The part that is educational happens when you explain how the components make a transmitter.

[@IdealIdeas100]

Would is be possible to swap the Mic out for a headphone jack? I would think that would increase audio quality vs using a microphone.

[@anshulmathur9368]

+IdealIdeas100 yes, check out the MAKE: video for fm transmitter making

[@runforitman]

+IdealIdeas100 why swap it, when you can add it. get a stereo audio jack and wire it up, very easy

[@saikittang7450]

why no have both and use a switch to choose the input mode

[@runforitman]

Saikit Tang you don't need a switch

[@fortoday04]

+runforitman shut the fuck up

[@latzobear]

I remember you from the google science fair

[@realcartoongirl]

no you don't

[@turolretar]

@@realcartoongirl wow thats rude

[@joshuaandrian2888]

i cannot access the google drive link you put on description box, because you don't allow me to read or download the files, but i was very happy when watching to your videos tutorial, because its increase my knowledge..thank you

[@hazimreitz]

I'm just glad people around me where I live is like chill just about anything unless it involves their money.

[@Andrew-my1cp]

Is there a way to use lower voltages with this transmitter? Such as switching resistor values or something like that? Thanks in advance.

[@TheTimeRay]

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

[@mddanishakhtar9025]

No brother..... From my calculations, the resonate tank frequency is around 79.61 MHz~approx 80 MHz

[@charlesorlain5184]

How did he connect the audio from the computer to the transmitter?

[@chriswouse7713]

Whilst that is pretty cool, you should really note that you need a license in some places to broadcast on any public radio band. If you get caught, it can land you in serious trouble and a heavy fine! Keep the power low to avoid interfering with other listeners in you neighbourhood.

[@Kaleb99j]

+Chris Wouse that is true you need a Ham Radio license from the FCC to broadcast with this unless its an emergency or its Family Radio Band (Walkie-Talkie or CB)

[@ethanarcher9783]

when i went and got my license i remember something about 2 watts and under is legal could be mistaken though

[@shreeshahegde2875]

What is the value of inductor in terms of mH??

[@dietdido]

can you adjust the frequency band that the transmitter is operating?

[@king_wing34]

yes

[@juelpereira9404]

Really, I hope is every week, that will be cool

[@mendez31971]

Great video ,keep them coming . Could i ask how would you use the multimeter to tune the transmitter

[@MrFiver1111]

In my country you can go to prision for this, if the range blocks out the whole area

[@allthegearnoidea6752]

I have worked in electronics for years and never new to use a 1/4 bolt as a coil former. Just shows you can teach an old dog new tricks

[@mikeg6991]

That handheld radio is pretty bomb.

[@Fumacenta2tempos]

What happen if I set it at no-free frequency?

[@nikothepro7307]

MoNkey'S HuE the two sourses will meshu up and you will hear strange noises

[@RyanBarnes]

What kind of battery life could we expect to achieve with a 9v?

[@TechBuilder]

3-7 days :D

[@TechBuilder]

***** It lasts, longer than you think :))

[@RyanBarnes]

Interesting, wouldn't have expected that kind of life from something like this.

[@Kaleb99j]

+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.

[@Ghost572]

Depends on how much current the circuit is using overall, the more current the faster the energy is being drained out of the battery.

[@smaklilu90]

what if i want auxiliary input instead of the mic?

[@Dyl_Cam]

Soldier the negative and positive from the mic to an aux cord -_-

[@thephaseshifter]

+sami aklilu than you can pirate radio XD

[@gfr2023]

you achieve a good performance from this simple circuit !!! i have experimented with similar devices but I had to move on the CB band to not be "muted" by powerful commercial FM stations

[@hippiebeetle]

any tips for someone building this for the first time? (newer electronic hobbyist)

[@gfr2023]

@@hippiebeetle look at my video about FM bugs and check the description

[@ingenierocantor]

With this video/project you have won a new subscriber

[@JohnAK72]

3:43 UFO! they're back.

[@roelkemps9387]

Welgodvergetengrafkankertering. Net doend of ik Julie it's her head an maar godverdomme ophouden!Wat juice eropsl

[@reddunkey9267]

Its free energy

[@matteoZattera]

Can I use a BC547 instead of 2n3904? Works the same?

[@l3p3]

MAERSK try it

[@tanmay______]

Should work

[@maxxiang8746]

what about bd135?

[@dj505Gaming]

The PERFECT rickroll device :D

[@VR2ZXP]

You did a very good job. Now the next step to do is QRO by an amplifier, then broadcast to the city. : )

[@keithking1985]

I remember seeing a channel (an English guy) making these on a 2p copper coin.. using the coin as ground.. he also made one like this for the top of a 9v battery.. i thought this was his channel.. this is a cool little project 😊

[@manikrai1508]

Can we just replace the mic with mono phone plug?

[@dcfuksurmom]

yes, its the same type of signal, but a headphone output is usually amplified.

[@MatheusMPL]

Can I change the mic for a 3.5mm stereo male cable? I was hoping to listen to my PC music through the house without carrying it with me! xD

[@kutlu13]

Sure. But be careful with polarity. This crap can easily burn itself and your sound card.

[@MatheusMPL]

Kutluhan Mutlu Guess a mono plug is the only way of it. In this case I should match it with the polarity of the circuit?

[@MatheusMPL]

Kutluhan Mutlu And thanks for the infos! :D

[@kutlu13]

Yes, using mono input is the best choice. If you want to use stereo you can combo 2 wires together to the + side

[@MatheusMPL]

Like connecting the two channels in parallel, at the same point?

[@havbaba]

Can i use aux input instead of a mic? Or does someone else have a great tutorial on that?

[@dcfuksurmom]

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

[@buttersstotch2014]

Yes

[@youknoweverything7643]

I made a fox hole radio transmitter over fm waves and i only knew how to build it cause a book in my elemetsry schools library explained how toae a fox hole rasio transmitter like they used in ww1,ww2 and Vietnam. I did it kne sat morning getting electronics from my schools store thst sells electronics and other stuff for kids to buy for thier projects at a discounted price compresd to box stores and i was 11 and my dad was impressed cause he was in the airforce and havnt seen snyone make a fox hole radio in a long time and he said he couldn't believe that his 11-year-old son would be the last person he saw make an FM radio transmitter like a foxhole one at 11 years old all by myself too My daughters looked terrible because I soldered the wires instead of just crimping so it'll be more permanent but it worked

[@urducolumnstudio]

V good work

[@RamLaska]

This is very impressive, but I should add that depending on where you live, there are applicable laws concerning using the broadcast FM band. In the U.S., there's a narrow slice at the beginning of the broadcast FM band (around 88Mhz) where you can broadcast with a small, low-power transmitter (like the kind they sell to pipe audio from your phone to your car radio). Also be aware of the power output limits in the regulations. A friendly neighborhood amateur radio licensee might have the equipment to test this radio and tell you how much juice it generates. I'm sure it's not much, but it might be several times what's legally permitted (again, depending on where you live). Please be nice to the radio spectrum -- it's something that everyone uses ever day, and if it gets abused, it will become harder and harder to use freely. Look at drone laws in Canada if you need a good analogy. Good work, kiddo! :)

[@smartindiaOfficial]

nice

[@realcartoongirl]

this kid has a better future than me

[@CWGminer]

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.

[@taurruth]

Nice project. Now we have to build receiver for it. Also adding push button to transmitter would make it closer to Walkie Talkie :) I just wander if there are any regulations that would make using this kind of pirate radio illegal on FM frequencies?

[@richpayton7162]

While this now an ancient reply, new electronics hobbyists should start out at square one with not using a screwdriver for the tuning of circuitry. There are a number of technical as well as safety reasons for this, and while using a screwdriver to adjust the tuning of this transmitter may happen to work with this circuit, as you may advance to more critical projects the need for a proper tuning tool will become increasingly important. While not very expensive, such a tool or set of these tools need to be in your kit for present and future work.

[@shan_singh]

How can the audio be so clear???? . i made myself and it took ton of work just to get frequency in the range, the audio was pathetic, a lot of noise and interference were there. When i soldered the circuit, the frequency was lost! Now i think most of the transmitter videos are fake

[@reyatireyatireyati7140]

...I've been made too many RF projects in 1995 --FM TRANSMITTER 50 watts

[@tmxl7847]

Do you have schematics?

[@realcartoongirl]

rofl lyier

[@TRENTINATERx2000]

Can you use insulated wire for the coil?

[@reyatireyatireyati7140]

@@TRENTINATERx2000 Yes, same insulated wire which used in winding motors.

[@reyatireyatireyati7140]

@@tmxl7847 I had everything previously, but I'm outside my country as I had immigrate forever, my dear I advise you to read about RF, in other words don't just copy schematic diagrams in order to execute a specific project, you must create your self knowledge foundation that enable you to do any RF project. Schematic diagram doesn't matter, but the main principle does matter, read about Analog and Digital RF...

[@theengineer7265]

Hey mate! This is a really impressive project and a well made video. How long does one battery last?

[@simondobes8570]

Can I directly connect AUX output to the microphone lines? Great tutrial!

[@hazzaaalayoubi7617]

Great job, amazing experience , you reminding me when i was young but with less budget :)))

[@ZEROgring0]

why not just add a audio input instead of a mic nvm defeats the purpose of spybug :V did not see that

[@KurumiZph]

At what frequency does it transmitts fm

[@Povilaz]

It transmitts on all frequencies as he said.

[@dcfuksurmom]

depends on what the variable capacitor is set to

[@childofthemosthigh5485]

ME: STARING AT MY SON AND HE JUST GONE KEEP PLAYING POKEMON

[@2fathomsdeeper]

Put a 36" antenna on it and it will go for a couple of miles. Built the same and used them for wireless mics for A Chorus Line many years ago. Dirt cheap wireless mics, but a pain in the ass finding all the recievers.

[@whatitis5646]

Add more electricity and you should be able to broad cast farther if you add a powerful dc or ac output depending what that battery produces.