How I made an AM transmitter

[@TRASHLEVIATHAN]

reddest man alive tries to sell me pcbs

[@h7opolo]

he used a green screen filter which removes the green color thus making him look redder, but he failed to adjust the "Key color spill reduction" level which would have normalized the hue.

[@power-max]

@@h7opolo I think more accurately what happened was the cameras auto white balance trying to compensate for all the green. Its why you should set it manually with a white card. Although this could have been fixed in post to some degree as well.

[@Scott_C]

Also... the echo.

[@KeystoneScience]

Man. If only you knew how much my girlfriend mentions this comment to me, it’s been like 69 times thus far 😂

[@KeystoneScience]

Power Max woah! I haven’t seen you in a while power max! How have ya been?

[@JeffFrmJoisey]

This reminds me of a funny story my Dad told me from when he was a kid, around 1940. He and a friend both built tube AM Receiver/Transmitter in/on a cigar box that they could attach a telegraph key to. They lived in the same apartment building in The Bronx, on different floors with windows facing the same way. Well, they connected their radios together via a wire strung along the outside of the building and they discovered by messing around with the tuning and telegraph key, they could change radio stations on their parents' radios on a certain frequency, just like yours. Only problem was that their connecting wire acted as an antenna that was 30-40 feet long, and they were changing people's stations in the building and then some. Guess who came a knocking?? The FCC! When they saw it was 2 kids messing around with changing their parents radios and not realizing they were affecting much more than that, they got a lecture and made them disconnect the radios from each other!! BTW, glad I'm a fast listener!

[@ozule1782]

Wow! You came back! This video has exactly what i need!

[@henryswan1374]

you're the person who got me into electronics! thank you!

[@sammkablaam]

It’s been a privilege to watch this channel (and you) grow into what it is today. Refreshing to see some worthwhile, educational content within a never-ending sea of garbage. 🤙🏼

[@hunter1q12]

Glad to see your officially back, watched a few of your streams when you were still in college. Nice work :) and congratulations on graduation.

[@arkhilious]

Congraduations?

[@IT-sq5rj]

Who was disappointed that he didn't play his theme music like he has done previously. We love you mate!!

[@grzesiek1x]

the very low power transmitters and home built receivers are really great! Low cost and also safe range ( so we can't interfere any other signals, radio stations etc.) but it is very satisfaying to build for its own something like this and having fun with it, exploring and observing really astonishing things!

[@the_ALchannel]

The infamous Tomato Man and his AM Transmitters

[@matthewsharp1178]

I'm so happy you're back

[@soonersciencenerd383]

the am antenna is a ferrite bar inside the radio. the fm radio antenna is on the outside.

[@interesting7215]

I can't send letters at the moment, but I just wanted to say, I love your videos! You have inspired me to start collecting old electronics and re-using them for new projects! So far I have built a pocket taser, emp, microphone, security camera, data transfer, Bluetooth transmitter and receiver, computer and bench power supply, all from old electronics! Keep doing what you are doing and you will certainly hit that hefty 1 mil subs! :D

[@Brazillianize]

... this is the first video that I 'liked' (button click) after just watching the commercial you did for your sponsors ... and now I'm subscribed too!

[@dangitsandy1745]

YAY YOU ARE BACK, I didn’t want another Greek gadget guru incident.....

[@raghavendrasharma225]

Last time I checked one of your videos,your channel had 50-60k subs, and now 200k. Time flies like a f***ing bee

[@rajvanshsingh2018]

I am glad you are back.....

[@secretagent5658]

Hey you're back! :) Glad to see someone who is my inspiration back in action :) I made the microwave gun and several other things. I even got my welding machine idea from your high voltage microwave oven transformer video for lichtenberg burns.

[@AmorDeae]

I've been thinking of making a radio transmitter for a guitar. Radiocomms are pretty dirty around here anyway what with a lot of people with less than legal homemade transmitters, so having a signal that will be readable within my neighborhood won't be a problem, so I might make an antenna of about 65cm possibly mounted along the strap to get some quality and get rid of some more noise.

[@mamupelu565]

Your explanation in this video is better than the other's where you show how to build a crystal radio.

[@nitul2034]

Yoo boiisss keystone is back....

[@herupur1117]

Next project please make an homemade variable capasitor bro

[@bomberoo243]

Felt a bit brief, I feel like this is transmission lines? I know it's similar property of the 1/4 wavelength rule you mentioned. But it looks at 1% of the length of the wavelength being propagated. Maybe these are two separate concepts and I need to Google it out.

[@Playerpool]

thank you for this video ! i'll make this project for my science exhibition at school !

[@MrTauron77]

I was able to solve the stereo-mono conversion easily, so that there is no distortion on the mono output. The stereo signal enters via two RCA connectors, which are passed through a stereo 47K potentiometer. It goes to the 10K mono potentiometer via 2 1 uF capacitors and 2 1K resistors, and from there it can go to the mono radio transmitter via RCA output. So far, it has been successfully used on AM/LW, OIRT FM and SW radio stations.

[@sonofmanarkjazz8965]

"Spicy." Sir, you had me at "you're watching Keystone Science."

[@yee2867]

Nice!

[@slainwolf180]

I made this and it works great. Inside my room. Outside my house, as far as the swamp, doesn't reach that far.

[@jeavalos]

I've been watching your videos for a long time now and today I was watching Groundhog Day (Bill Murry) and noticed the truck LOGO! It even said KEYSTONE!

[@andrewhamop6665]

As an amateur radio operator, I thank you for not blasting out power or using a good antenna. I've got a long dipole antenna in my backyard, kind of thing that you would use for 1/2 wavelength AM or shortwave, and it's crazy how much interference I can see. Now of course it depends on the time of day, but because devices like this are so easy to build, it's very common to see crazy interference especially in populated areas. Now if you were to use heavier-duty components, more power input, and a 1/4 wave antenna I'd bet you could get some decent distance on that. But of course this would be bad and quite illegal like you said. It's actually very trivial to direction find even a moderately weak signal, but nothing nearly as weak as what you are putting out and it's not an issue anyway because you are not creating intentional interference and keeping your power output miniscule. Again thank you for your educational and fascinating content. I am glad you are back, keep it up!

[@Dark_Matter2]

What would happend if someone uses spark gap transmitter

[@TheRagingWookie]

Glad your back making vids!

[@EdwardTriesToScience]

This is work great with the crystal radio!

[@AshutoshSingh-to9vx]

Can you Make an oscilloscope using Arduino. (Making sure it has high input impedance)

[@danbhakta]

You were one of Thanos' color there for a bit.

[@noodleheadclub8846]

What are the odds? I was just watching ur previous video.

[@cvzerotubeyou]

I bloody love you man!

[@smburhan6323]

Awesome editing !!!

[@eliconner7347]

hey I have been thinking about making a tesla coil and I was wondering if they high voltage capacitors you made in a video a few years back would work? I was also wanting to ask if laminating sheets could work instead of projector film to make the capacitors.

[@IT-sq5rj]

Love the lighting swing.

[@butteredbleach3265]

The circuit diagram of the transmitter as me a bit confused. You have the Aref pin and the A0 pin connected with a 1k ohm resistor. Assuming no significant current is running in or out of the Aref pin, both pins would have the roughly the same voltage on them. Doesn't that mean that AnalogRead(A0) would always return somewhere around 1024? (I haven't seen the code on the Arduino yet, but I imagine this would be a problem as I'm guessing the A0 pin is being used to interpret the signal from the audio input)

[@Blu3Jao]

Nice video. I was expecting you to make a series fed Hartley oscillator with that huge varicap and attach the data line through the xistor, but I should have known better; we have the technology!

[@mustafafaruqi2097]

When are you going to make the video on the Large Tesla coil

[@fleckione-workinprogress4249]

very useful Video!

[@FinehomesofNewHampshire]

Thank you! If you ever need growlights.... Ill send you some!

[@mohamedtebbo123]

I like your work man !!! Keep it up , hopefully you get more subscribers !!!

[@meow-says-the-cat]

The oscilloscope is mesmerizing

[@amirouw]

i personally enjoy your videos

[@KRAFTWERK2K6]

Oh damn, I definitely have to change some values in the code from 10 to 9khz because i don't live in Yankee land :P Other than that this AM transmitter is pretty straight forward and a really nice use of an Arduino. So i really don't need 10 meters of wire for the Antenna but just a short retractable FM antenna would work too? Because i really only need it for a short reception range.

[@AmanKhan-ec6lg]

I don't have the display screen.. Can i build this circuit without that display screen that you have used in video?? Plz reply

[@teku3985]

Awesome video! I’ve been a long time viewer and was wondering when you would make an in depth video talking about AM or FM radio 📻

[@treasuretotrash2067]

Yay hes back!

[@trr3576]

Analog AM right?

[@DIYBiotech]

hahaha what a beautiful advertisement

[@colddheartt]

Can you build a radar detector? 🤔

[@Donkeyking92]

You are so smart. I didn't understand all of it. Like your video.

[@SteveCockneyRebel]

Is it the same for FM? what needs to change?

[@noodleheadclub8846]

I'm getting (no matching function for call to'Adafruit_SSD1306::Adafruit_SSD1306(int, int, TwoWire*, int)') error.

[@bisericadamaroaia]

Hi. I want to make the AM transmitter. I need a link where I can find the diagram and the list of parts. Ion

[@narayanbandodker5482]

Wearing a lab coat adds +100 scientist points

[@SCIENCEMAKER]

❤❤❤

[@stellasolaria6224]

Please help me, I didn't find much difference in building an AM and PM transmitter, but how come???? Please help please please please please please🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@focusonprojects3455]

Can you send the circuit boarded ?

[@ufochannel01]

can you build a rf receiver that would receive 1.680ghz ? it is important it is thought to be a new alien signal transmitted every time a ufo is nearby. it is true i have seen this happen. so can you make one? and can you show us how also? thanks love your videos!

[@Docbell60]

Oh this was exactly what I was doing

[@Bruh-fc7ik]

Pirate radio time

[@garyhalsey7693]

Pretty good video. Just one point (without mentioning the AMDSB transmitter that you’ve built, as opposed to SSB), is that your resonant frequency equation should read Fr not F. Apologies for the incorrect F, my iPhone doesn’t do subscript lol. You still have a new subscriber though!

[@Un_Pour_Tous]

This can be done with a rpi3-B

[@mohammadbanisalman8640]

I think I know how make a ionic metal detector, but l need some one builds their it's circuit. can yo do this

[@bunazsofia1088]

how can i make an analog tv transmitter?

[@najamhaq]

Nice veiled way to say sorry. Did the person responded back ?

[@andreabaldini7073]

you can do the ace at 9khz from 531khz to 540,549,558 ..... up to 1611? what should i change in the arduino code? Thank you so much ..

[@FrancisLitanofficialJAPINOY]

Also up to 1701 kHz for Australia, Guam, Saipan and the Philippines

[@illum36963]

Wow thank you sir. PCB I would love it ♥️3oak🖤

[@erygion]

Ah sounds like crap, I love it! I gotta make one of these, I'll follow your Instagram. Thank you for the great video, I'm glad you're back.

[@siemiessidestep6449]

very nice

[@syedbn]

Sir where are you from, I'm big friend.

[@Eric-yj5xg]

Play alien sounds on a popular am radio. If that exist.

[@elektrobear2027]

Why do you look like a cooked lobster in the intro?

[@KeystoneScience]

I had to adjust the lighting for the green screen chroma key to work well :P

[@elektrobear2027]

@@KeystoneScience good I was afraid you'd gotten sun poisoning or something. 😀

[@cobalt_3283]

just lay out a really long wire and use it as an antenna tho

[@atharvap1994]

Can we still expect the Codys lab collab?

[@mohali7027]

Thanks for all the videos could you make metal detector

[@FloretteLalatiana]

Song name pls

[@mannyquinn9031]

Hey keystone, what do you study in college ??

[@egilskalnins6635]

try to make fm transmiter

[@crazystuffproduction]

would love to see some SSB

[@Chor_Ultra_Pro_Max]

When you're making SSTC?

[@isaiahhiggins]

420khz, nice

[@鄭有成-w5z]

I am so miss your video

[@kerron_]

cool video

[@electroimpyo]

Easy to build shortwave radio transmitter

[@the_ALchannel]

BTW nice video

[@EnterJS]

Hey ! How to Make a Multi-Freq . Transmitter Hit like & Make Him Sees

[@bluesonkel]

digital am transmiter to understand analog radio?? -.- its not the right way to learn electronic

[@nigeladams8321]

This is going to be useful once the bombs drop

[@sarchlalaith8836]

*Bumps up power drastically creating a jammer...*

[@mamupelu565]

so thats how you build a jammer... could you disrupt drones though?

[@dtteamofficial]

16mhz is the cpu speed of the arduino

[@mamupelu565]

Show us how to make a 2.4ghz device from scratch, like a wifi card??

[@amyshaw893]

FCC? I thought you were British 🤦🏻‍♂️

[@sarchlalaith8836]

Bruh.... With that accent? No. I'm British, he's a yank, 100%

[@beanbop373]

Hi

[@KeystoneScience]

Hello ;)

[@beanbop373]

Have a good day!

[@beanbop373]

And I think I was first!

[@beanbop373]

But don’t quote me on that

[@G7VFY]

I am not sure that this is the simplest AM transmitter you could possibly make. Why a microcontroller??

[@whatthefunction9140]

MORE SCIENCE!!!!

[@kolinevans9127]

Lol awesome

[@LPkukin]

You look like Ben Heckendorn's lost child.