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

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.

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.

You have some really well presented videos. Subscribed.

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

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

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

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"

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

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.

crap they shut down all the radio shacks lol

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

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.

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!

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

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

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.

That WinRar is paid version? :p

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.

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!

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

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

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.

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 !

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!

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

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

A bit complicated for my brain, but very cool!

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 ^.^

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.

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

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

3:43 UFO! they're back.

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

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

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

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?

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

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.

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

The PERFECT rickroll device :D

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

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.

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"

Can I use a copper wire instead of solid wire

I remember you from the google science fair

So I made one of these. Except for the circuit was Stronger, because I wanted a higher wattage.(1.5KW) I wanted the signal to reach further. I don't know it's legal to make an FM transmitter. I had mine running for about six months. Until I was forced to shut it down. Some unhappy Suit dudes claiming to be from the FCC. Had a warrant and confessated my transmitter. Now I have to pay off an insane fine, I wasn't even harming anything. I was just propagating an electromagnetic wave. Apparently you need a License to own and operate a transmitter. At least in the USA. My country has turned into such a dystopia. I don't see a reason why they need to govern Electromagnetic waves. It's light at the simplest. Even GMRs which some walkie-talkies have built into them. You still mean the license transmit on certain channels. I'm honestly to the point to where I want the FCC. Defunded. I don't even see a point for that branch of the government.

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?

Wow! Very neat and professional!can't wait for 2nd week!

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???

Made one with a 12V car battery when this video came out. Just got out of prison today.

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 😊

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

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

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

When you said head over to your local RadioShack I had to check the date in the video lol 8 years ago

What is this 2014 or somethi-

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

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

That handheld radio is pretty bomb.

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

Really well-done video man!

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

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

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

nice

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

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

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

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.

Amazing this is the first time i can build a radio by my self with the available components i have.

I've remembered a good old prank. It were later 90s and I've didn't knew that this word ("prank") will be ever known. It was an "early Internet era". I was sleeping on my physics' lections few times just because the provider's telephone line was NOT busy! :D The prank: an old elevator with doors controlled by a light switch. A protection device. Clever thing BTW! :) It was in our univercity. 1st floor in the main building (nevermind the name it's in Russian anyway). Me and my pal found that a light switch's case is "damaged" (the device was working though). So if you'll put a piece of paper or any small object in that device then the system will be "thinking" that somebody is not in the cabin yet! We've put a small round paper ball there and did gone in a place near this elevator but on a distance so nobody will think that "these guys stand near here and watching for something!". The whole gag was in the situation. If you enter that elevator you usually wait for some time and if nobody goes in then doors starts to close. But if somebody runs into it then everybody waits again! :))) So if a pause between these events isn't very big then people just think "OK". Next others doesn't know that they've waited longer than usually. If an elevator doesn't moves up then some people think "meh, it's not working again!". They usually go out and use a stairway. Few people walked into this elevetor and wait... They wait and smiles after sometime ) Somebody didn't thought out it's a gag and did used the stairway then :) After some time we've seen an elevetor almost full of students. It's a rare look I must say :) Or was. After about 5mins or later somebody did found out that there was out tricky paper ball :) Did laughed a bit and everybody got fun :) The end! No wet clothes, drops or anything tragic to anybody :) It's pitty I've didn't had a camera those days. Film cameras were very noticeable, digital had a very rough quality picture and light characteristics, portable movie were not for our wallets :)

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

I don't find 40pf or 20pf trimmer cap I find 33pf fixed with 0.1uH then what's the frequency broadcasting??

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

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.

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

The FCC wants to know your location

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.

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

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

what if i want auxiliary input instead of the mic?

Finally I can play earrape music over the gas station intercom.

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

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

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.

YO!!!! this shit actually works. I made one. HINT: the bigger your coil is the further up the MHZ range will be.

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

this kid has a better future than me

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

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! :)

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?

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

I want to do this to stream the whole Three Dog dialogue + Fallout 3 oat

So glad I can make it a FM transmitter when I have a phone lol

bro just got the whole government watching 0:45