How to make a FM Radio

Рет қаралды 239,523

Күн бұрын

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MATERIALS:
Magnet Wire: amzn.to/423cBXm
MOSFETS: amzn.to/3mZW3iY
Potentiometer: amzn.to/3yVJPup
Hi Power 50 OHM Resistor: amzn.to/40rw42e
Capacitors: amzn.to/42lVekK
Wire Kit: amzn.to/3z0lAew
DC Power Supply: amzn.to/3YZ4jx6
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Whelp, here is how to make an FM radio to go with the FM transmitter Build. Enjoy! :D
Support me on Patreon to fund better experiments :) : / keystonescience
Join the discord discussion! : / discord
The pen I use was donated by: hobblecreekcraftsman.com
Intro Made by Tate Storey, check out his channel! : • Thing that happened to me
My multimeter was donated by goo.gl/uOGdwd
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AM transmitter: • How to make a AM Radio...
FM transmitter: • How to make an FM Tran...
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Inquires: Sequence01123581321@gmail.com
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music:
Broke for free, Night owl ; pixel land, Kevin Macleod
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Twitter: @Keyst0neScience
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Пікірлер: 341

@unpreppedprepper2710 3 жыл бұрын

These circuits usually won't work, except you are living next to a radio station and you are using a very long (4-5m) antenna. For the RF amplification you will need an RF transistor, which can handle those high frequencies. When you use a LM386 as an audio amp, make sure you use this 10µF capacitor between Pin 1 and 8 AND at least a 10µF cap directly at pin 6 and 4 and also an 10µF cap at pin 7. The LM386 can't handle this high amplification without a buffer and will otherwise produce loud squeaking noises. The other thing is: FM signals are not easy to demodulate. With discrete components this would be very hard...in these days you'll need a PLL FM-decoder IC or something like that. For testing purposes you can use something that is called (i don't know the english translation!) "edge discriminator". This is done, just by adjusting the variable capacitor next to the exact wanted frequency, as you are doing. But this sounds awful and if you turn the cap 1 tenth of a mm to far, you will hear nothing. You also need to keep the wire lengths as short as possible....you can't do it on a breadboard. The wires of your coil are too long. If you would solder it together directly, you would get much better results. Try to use silver wire, instead of copper wire for the coil! But even though: the results will be "experimental" and not satisfying...

@JuanPablodelaTorre 7 жыл бұрын

99Mhz ±10 is almost the entire FM range! I giggled.

@krek420 4 жыл бұрын

102.10

@DaveFer 4 жыл бұрын

I had the same thought, but still impressive that he arrived at that estimation. :D

@iceberg789 4 жыл бұрын

hehehehe..........

@bolbi6099 Жыл бұрын

105,6 😊

@da9s 6 жыл бұрын

Just came across this channel I've watched several of your vids so far I'd have to say it some the better stuff I've seen on KZfaq. Keep it up mate you have some good stuff on here!

@ShreyasJani007 7 жыл бұрын

You're one of the best science diy channels on KZfaq..why aren't you more famous??

@jakubrejzekjunior7349 7 жыл бұрын

Shreyas Jani y science without rockets, explosions and metal working is not the best deal on KZfaq.

@dalmatiko 6 жыл бұрын

he can build nuclear rocket

@projectmanagement2356 5 жыл бұрын

@@dalmatiko sure man. When?

@isaiahwhite9390 5 жыл бұрын

Because all those click bait thots and or dumb channels with mediocre content hahaha “we are going to do a little bit of math “ I’m like wtf hahaha good stuff though I work on bikes so wiring is fun wanted to learn more about stuff like this so started watching this channel it’s great! Keep up the great vids

@kimm7903 6 жыл бұрын

Thanks so much for this video ! I graduated with a degree in Physics and had to take a course in Analogue Circuits. Didn't do to well, but I'm hoping to start projects on my own.

@SWGankie 7 жыл бұрын

This is legit my favorite channel... I am always looking forward to new content being put up :D I'm an upcoming engineer/inventor and I love to build random stuff so naturally I'm going to love watching this stuff lol... A couple things I would really love to see in later videos are something solar powered (solar fire starter, solar taser, etc...) and I would really like to see some kind of give away cuz I would totally want a souvenir!!! Also I was curious where are you from/living?

@47kotzur 6 жыл бұрын

I love this video. It explained this in detail so I can finally progress with my self learning. Thank you!

@sawyer7973 7 жыл бұрын

Aww I wanted to see a test of the homemade fm transmitter broadcasting to the fm receiver he made. Great video though.

@shutdahellup69420 6 жыл бұрын

Sawyer H same🙍

@elektronikdevretasarimi4005 4 жыл бұрын

You can see a test of fm reiver and transmitter I made

@trininite 3 жыл бұрын

its quite illegal to broadcast fm radio without a licence. Unless you keep it under something like 1mV at 1A

@themeez1000 7 жыл бұрын

Yup. definitely one of my top two channels. Videos are very good and informative.

@fourtwozero 7 жыл бұрын

Always a good day when I get to brake out the 2N3904's!

@corrosivecopper 7 жыл бұрын

Always informative!

@micomoreno6252 7 жыл бұрын

thank you for helping me understand [rf], by seeing it and hearing what you said it finnaly sank in, sometimes it just takes the right teacher for me to understand something.

@logicawe 5 жыл бұрын

That was amazing, I'm going to watch it again right now.

@9mm4now12 7 жыл бұрын

subbed due to a shout out from backyard scientist. loving what I see so far.

@KeystoneScience 7 жыл бұрын

+Dash Cam Trucker thank you! :D

@tomwold8269 5 жыл бұрын

Your explanation is awesome, but you do it so fast. Maybe slow down a little bit. Great job.

@kolelokaram8541 4 жыл бұрын

KZfaq videos have a speed setting.

@peterjensen3162 4 жыл бұрын

Too hyper for me, a little more calmer amd this would be perfect.

@MichalHaltuf 4 жыл бұрын

I hate slow videos. This is awesome speed. You can scan the content very fast thanks to it and then stop when neccessary when trying to do the same project by yourself.

@coler154 7 жыл бұрын

excellent job pacing yourself!

@johnsmith7709 6 жыл бұрын

I gave you a thumbs up, but, I can't comprehend what you are saying because you are talking so very fast. Great concept. I like it. Thank you.

@planker 2 жыл бұрын

And thats how we slap stuff together. Awesome Video!!!

@nikola8621 7 жыл бұрын

I know nothing about electricity, I enjoyed this video. subscribing!!

@nikola8621 7 жыл бұрын

oops I was already subscribed

@dradexx 6 жыл бұрын

good work dude, keep it up!

@henryswan1374 6 жыл бұрын

your my favorite person i dont know personally

@KeystoneScience 6 жыл бұрын

awe thanks :)

@DaveFer 4 жыл бұрын

Hey, great video. Thanks for doing these. Very impressive math. :)

@randallbashta6957 6 жыл бұрын

Good video - I have an FM video like yours on You Tube, using the same circuits. You did a great job in explaining how to make it.

@brodie9981 6 жыл бұрын

could you link me? i am struggling to get mine to work

@yiva2037 6 жыл бұрын

Genius!!!!

@dz-abouttechnique1849 2 жыл бұрын

Nice video!

@petrorock3325 2 жыл бұрын

Your video is awesome. Congratulations for your work

@N1RKW 7 жыл бұрын

Suggestion: To access those tiny trimmers, you can make your own trimmer driver from a small plastic paint brush handle. Just file the tip of the handle down to the shape and size that fits the trimmer cap, and now you have the correct driver with the added bonus of it not damaging trimmers like metal drivers can.

@KeystoneScience 7 жыл бұрын

+N1RKW that's a great idea! I will do that! Thank you so much!

@N1RKW 7 жыл бұрын

Glad to help! It's a technique I've been using for years, and it's worked well for me.

@heddybaby1000 6 жыл бұрын

Great video

@muteebrahman6503 6 жыл бұрын

Wow your writing is such wonderful

@Elfnetdesigns 5 жыл бұрын

LM386 is not an OP Amp.. it's an actual linear audio amplifier and are commonly found in non stereo devices like a fax modem to drive the internal speaker or some toys that make sounds. Some PC speakers used them early on (one for left speaker and one for the right speaker) but now they use ond of the TDA IC varients for stereo sound amplification. Most of those cheap varible caps use plastic sheets to change the capacitance. same for modern dual gang tuning caps. The one you are using is a trimmer.and is VERY touchy, For the best band coverage you should use an actual tuning cap. That big .22uF cap is an AC line cap, it's overkill for this application but it will work lol

@anonymous-et6to 5 жыл бұрын

This guys underrated

@robertjr.kibble8053 Жыл бұрын

This. Is. Amazing. Ty for this

@robertjr.kibble8053 Жыл бұрын

Great explanations for a noob, very detailed. Awesome. Exactly the typa stuff I wanna make some day

@thebarbarian4408 7 жыл бұрын

keep up with great work 😊😊

@bagherhabibi 5 жыл бұрын

Best of the best ty so much

@Luca-jy8ne 7 жыл бұрын

Hey, cool video :D Just one thing: when filming the vlog type intros, you might want to wait a second before you stop the camera after saying a line xD

@thomaswood8233 7 жыл бұрын

Great video! I would recommend that you stay away from electrolytic capacitors for ac decoupling of your power rails. They're polarized and the noise can occur in both directions. I'm not really familiar with this particular circuit, I would probably shoot for a .1uF ceramic cap instead of that 470uF electrolytic one, though.

@thomaswood8233 7 жыл бұрын

A common technique is to also put decoupling capacitors directly across the power inputs of your components like your op-amp. This can be more effective than just decoupling the power rails, because your breadboard itself could be responsible for some of the noise.

@gerryroberts662 Жыл бұрын

would a 4.7uf one work also 50 volt ??

@shafiqueg6337 6 жыл бұрын

Very good

@Tukuna70 6 жыл бұрын

Nice explanation

@martycannon7004 4 жыл бұрын

Goes through it very quick . Good though

@ropmon6791 6 жыл бұрын

you are a fing blessing

@planesmart75001 2 жыл бұрын

Your Great.

@anindyamandal86 6 жыл бұрын

i will be very happy to see you as my teacher

@gerryroberts662 Жыл бұрын

Whats the sensativity of the antenna ? Can you get in weak stations, low powered FM ones also ??

@abdulsami7042 5 жыл бұрын

Superb

@basheerbasheer9094 3 жыл бұрын

So nice and well

@PrajjalakChattopadhyay 7 жыл бұрын

Are the transistors operating as a double tuned amplifier (bypassing a narrow bandwidth)?

@ItsGoodToBeHater 3 ай бұрын

Kudos to the pen!

@harvishmehta287 6 жыл бұрын

Could you explain the positive feedback inputted into the tank circuit? My concept on that is very shakey...

@the_catalyst566 3 жыл бұрын

How do you increase the sensitivity of the tuning circuit?..like by changing the variable resistor to the one that was wide range

@salimkumar9748 4 жыл бұрын

Super bro thanks

@naderhumood1199 5 жыл бұрын

Great vedio sir...

@passtranelectronics 7 жыл бұрын

excelente amigo eres un genio yo he armado tu circuito del transmisor de radio fm y funciona perfectamente y tiene un muy buen alcance y a hora voy armar el de tu circuito de radio para ver que tal funciona los transistores 2n3904 no los consigo aquí donde vivo pero voy a probar con los c945 y el chip lm386 tampoco lo puedo conseguir pero voy a reemplazarlo por un tda2822 que es un chip estéreo pero lo coloco a funcionar en puente como dice la hoja de datos para que quede mono y suene mas fuerte con los 3.5 voltio saludos desde Venezuela amigo son muy buenos tus vídeos sigue así

@guillermoviramontes851 3 жыл бұрын

Te funciono?

@passtranelectronics 3 жыл бұрын

@@guillermoviramontes851 sin funciono pero después de derramar varias lagrima porque el circuito es muy sensible a la capacidades parásitas y toca jugar un montan con la bobina hasta encontrar el punto donde funciona mejor

@TeslaExplorer 7 жыл бұрын

I really dig the mini coil

@KeystoneScience 7 жыл бұрын

+Tesla Explorer haha thanks :D

@brownie9921 11 ай бұрын

That’s cool! I’m in eighth grade and actually kind of understood some of this stuff. I am looking to become successful me sort of an engineer when I’m older. Are there any courses or kits that you recommend to learn something like this

@aviesena 2 жыл бұрын

Excellent! Can you add AM/SW to this set?

@cristianmillapan5321 5 жыл бұрын

Thanks for the video, awesome job . I'm trying to build but I didn't understand very well, which wire you used. Can tou tell me please. Greetings.

@darthgumby2406 6 жыл бұрын

Do you have a printable version of the schematic you used?

@g8d367 7 жыл бұрын

Wow he is a genius

@talharauf3111 5 жыл бұрын

thankz

@luizantoniodasilvapereira3837 6 ай бұрын

Hi brother i make your theremin very good thank you im fron Brasil👍👏👏👏

@danielfromca 4 жыл бұрын

Wow this is amazing especially on a breadboard. The audio amplifier part I’m good with. Could somebody please explain the principle behind the left part of the circuit? How is frequency converted into amplitude for the op amp to further amplify?

@danielfromca 4 жыл бұрын

@J W I actually found out - this not a high quality FM circuit, but basically the way it works is that there is a principle called Injection Locking that says that a small signal will "lock" on to a Collpits oscillator and change its intrinsic frequency which is normally determined solely by the LC tank. So the antenna keeps changing slightly the intrinsic frequency of the LC tank. In turn the amplitude across the tank varies. The load resistor is voltage divided with the tank, so the voltage across it changes. Filtering the carrier is not necessary because the transistor amplitude stabilizes to audio frequency (you can see this last bit only through advanced math, it's not intuitive and usually doesn't happen; usually if you want an envelope you need something like a diode envelope detector). ( ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6774035 ) For it's simplicity this the HARDEST by far FM circuit to understand & the least intuitive. It's performance is also inferior to the usual ones.

@danielfromca 4 жыл бұрын

@J W Thanks JW - same to you. The subject is pretty hard, but i'd recommend "Principles of Electronic Communication Systems" by Louis Frenzl. Unfortunately it's super expensive, but the 3rd edition (one before last) can be found used on Amazon for a reasonable price.

@MrTheemptyword 5 жыл бұрын

The way you hold the fountain pen... :)

@geneticsnoobie2666 7 жыл бұрын

its cool

@milespeterson5049 6 ай бұрын

Do you think I could use a 10pF variable capacitor instead of a 22pF?

@johnmcgiv1 3 жыл бұрын

Great info but please insert a few commas and full stops, periods in your delivery as everything just rolls into a complete mush, many thanks for info.

@Bigboinkies 6 жыл бұрын

You better not be cheating with that inspire lol

@mark9298 6 жыл бұрын

hi can i use mini 0.1microfarad ceremic capacitor.plzz reply. thank you

@JimmyTurner 7 жыл бұрын

I watched this whole video and have fucking idea what's going on. Maybe i should learn some of this shit.

@chumashunderground6211 7 жыл бұрын

Same

@47kotzur 6 жыл бұрын

You should :)

@adejareajayi9300 6 жыл бұрын

Jimmy Turner blue film

@adejareajayi9300 6 жыл бұрын

Jimmy Turner blue film

@ibrahimmoakkit260 3 жыл бұрын

Can I apply 9 volt instead of 3.5? Or 3 volts instead of 3.5?

@razy4366 7 жыл бұрын

love how the numbers in your email are the Fibonacci sequence 😂

@KeystoneScience 7 жыл бұрын

+raz Y thanks xD

@SuperJhon360 7 жыл бұрын

I haveresently become interested about bluetooth connections I wish to make a big box speaker and makeing it connect through bluetooth but I am not aware of its limitations range, quality, speed of transfer and if I could even get it to connect. so got any ideas

@anthonyguy1347 5 жыл бұрын

I've got an old wooden table radio from the 50s. I'd like to put an F.M radio inside the case without modifying it too much. It's got a 6" speaker and I'd like to add an amp and an A/C adapter. I've been having a hard time finding the module kits I've seen on you tube. I'm also reluctant to order parts since I don't know how many ohms the speaker should be. I'm not a tech-head, but I can follow a schematic, any ideas on where I can go for assistance on getting parts? I live in the U.S. so the British modules I've seen aren't easily accessible. Thanks.

@arthurwellsjr.4082 Жыл бұрын

Mouser & Newark are also good electronic parts distributors.

@natefiver6623 7 жыл бұрын

WOW!!!

@ewedfyguyhiygfd 7 жыл бұрын

This guy is going somewhere in life

@nevermind4667 6 жыл бұрын

Cool

@HAXAHAX 7 жыл бұрын

can you make a review on the pam8610 amplifier

@grzegorzcichosz8240 7 жыл бұрын

Could you make a video about something like... van der Graaf generator? Or other generator of static charge Or maybe on converting a shematic to a protoboard and how to convert it to a prefboard

@firefox1136 3 жыл бұрын

Holy shit! I think I have the same scope as you. Could I use a cristal and resistor in the oscilator part of the circuit? Also amazing vid!

@christiancoding 3 жыл бұрын

Hey there! I want to make it get my local radio station so do you know a simple FM signal amplifier ಠ_ಠ. I know I can use a module like the tea5767 but I want to make it without a microcontroller or something else :-D. Thanks!

@Boerje69 7 жыл бұрын

Cool fountainpen

@dyshweb1947 10 ай бұрын

What's the difference between variable trimmer capacitor and potentiometer.? Can I use one of them instead of another. If not can you explain.?

@hobbyrob313 Жыл бұрын

I'm still surprised that the receiver is still doing so well! because breadboard is not really suitable for radios and transmitters. yes it can work (proves it now!) but watch out for that next time... healthy and kind regards from the Netherlands! Rob

@LucasGarrow 7 жыл бұрын

Time to make your channel official!

@KeystoneScience 7 жыл бұрын

+Lucas how?

@devanallesside 7 жыл бұрын

Keystone Science ask your network to verify you

@KeystoneScience 7 жыл бұрын

+Turky oh, I don't have a network... or at least I don't think I do

@capri2wd 7 жыл бұрын

networks take alot of your add revenue, you would know. nice vid.

@LucasGarrow 7 жыл бұрын

"Once your channel gets 100,000 subscribers, you’re eligible to submit a request to KZfaq for a verification badge." I just figured it was a button.

@trnavaneeth2574 6 жыл бұрын

what kind of speaker are you using impedance or something

@johnray854 Жыл бұрын

Can I use a potentiometer and campacitor to make a variable campacitor?

@mrdovie47 3 жыл бұрын

Your two transistors in the receiver form a circuit like a tunnel diode (at much less cost) the bias is critical, a pot would be good to adjust your 22K bias resistor to form a regenerative receiver.

@levirizkisaputra3729 Жыл бұрын

What is the purpose of tunel diode?

@mrdovie47 Жыл бұрын

@@levirizkisaputra3729 A tunnel diode is a special type diode that has negative resistance at a certain level of bias Voltage, meaning it can amplify and cause oscillation even at very high frequencies.

@mrdovie47 Жыл бұрын

In this radio the two transistors will fight each other to allow current flow, so one of them will conduct then the other transistor will conduct so that there will be oscillation and gain. I would use a 50K or 25K variable pot. (resistor) to set the bias point.

@levirizkisaputra3729 Жыл бұрын

@@mrdovie47 I have question sir, where is demodulation happen? May guest is capacitor and resistor before LM386 IC

@mrdovie47 Жыл бұрын

@@levirizkisaputra3729 The sound is demodulated in what is called a slope tuner, not a true FM demodulator. To hear the sound you tune close to the station (not on the peak) then as the FM signal changes frequency with the modulation, audio sound can be heard. But it is really AM reception with some static, not true FM.

@harshchikorde9495 7 жыл бұрын

hey please tell me more about the capacitors used

@raulcavalcante9193 5 жыл бұрын

Nice pen

@banhtv6342 5 жыл бұрын

Do you have fm transmitter circuit and guide?

@PyroTronix 7 жыл бұрын

Make Some more videos about flybacks transformers, I love The range

@PyroTronix 7 жыл бұрын

Ops I mean I love flybacks transformer videos

@amalkrishnaps1115 3 жыл бұрын

Brother I would like you doing a vdo on simple AM receiver with crystal oscillator

@darobotking8256 7 жыл бұрын

I've just decided on college right now too! what college did you choose?

@Letitbplz 7 жыл бұрын

Colleges and obvious choices Congratulations to you! Collegiate and Professional Fraternity choices! For future Ham radio members this video will inspire. oh yeah the laser razor request. I think it may be an impossible request at this time, so probably too early to say or ask just yet. The salt lake city downtown masonic lodge has tours! "The mission of Freemasonry in Utah is to teach and perpetuate a way of life that promotes brotherhood, self-improvement through education, high moral standards, charitable action, and community involvement."

@KeystoneScience 7 жыл бұрын

+Letitbplz are you also from Utah then I assume?

@sachin7814 7 жыл бұрын

Hey! Can I use LM324 instead of LM386???

@azzibrahim6739 6 жыл бұрын

Hi... i wanna ask it is possible if i change the value of input voltage, from 3.5V to 6V and what is the effect ?

@mrdovie47 3 жыл бұрын

If you do go to 6 Volts, you will have to put a variable resistor for the 22k one, I would go with 100k and start at high resistance adjusting down until you hear some noise or signal meaning you have regeneration. you could then measure the resistance you find best and put in a fixed resistor if you want to.