Building a Super Simple AM Radio Transmitter & Receiver! Keeping Wireless Audio Communication easy!



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WARNING: Always check your local law if you want to transmit something with AM! Sending on certain frequencies and thus blocking other licensed transmitters can be illegal. So if you want to try it then make sure that the transmission power is super low. In my example the transmitter was only capable of sending over a distance of around 2-3m.

Previous video: https://youtu.be/tLKsvHSADdw
Walkie-Talkie nRF24 video: https://youtu.be/SZYwvvh6m-s
Walkie-Talkie RF Modules: https://youtu.be/PKowvbnIxso
555 Timer video: https://youtu.be/fLaexx-NMj8
Voice-over Microphone video: https://youtu.be/ts-JqEVzvDo
Oscillator video: https://youtu.be/eYVOdlK15Og

Facebook: https://www.facebook.com/greatscottlab
Twitter: https://twitter.com/GreatScottLab
Support me for more videos: https://www.patreon.com/GreatScott?ty=h

More project information (pictures,…..) on Instructables: https://www.instructables.com/Simple-AM-Radio-Transmitter-Receiver/
Parts list: (affiliate links)
555 Timer: https://s.click.aliexpress.com/e/_dTrUY9D
Resistors: https://s.click.aliexpress.com/e/_dTPpXjt
Capacitors: https://s.click.aliexpress.com/e/_dU4FEsB
NE5532 OpAmp: https://s.click.aliexpress.com/e/_9JNpe3
Electret Mic: https://s.click.aliexpress.com/e/_AAJ0er
Perfboard: https://s.click.aliexpress.com/e/_AZXOgT
PCB Terminal: https://s.click.aliexpress.com/e/_dYbstfZ
XR2206 Function Generator: https://s.click.aliexpress.com/e/_Abhz51
TA7642 IC: https://s.click.aliexpress.com/e/_Adpjwb
100pF variable capacitor: https://s.click.aliexpress.com/e/_An8vVt
Enamelled copper wire: https://s.click.aliexpress.com/e/_9i1Heb

In this project we will keep it simple when it comes to wireless audio communication. Instead of trying to use an nRF24 or RF modules, we will go back to the old days in which they used AM radios. I will show you how such amplitude modulation works and along the way show you how to build a super simple AM transmitter and receiver. Let’s get started!

Thanks to KiWiCo for sponsoring this video.

Music:
2011 Lookalike by Bartlebeats

0:00 “Complicated” Wireless Audio
0:45 Simple AM Radio Solution
1:59 Intro
2:09 Theory AM
3:19 Transmitter AM 555 Timer (sounds terrible)
6:08 Transmitter AM XR2206 IC (sounds decent)
7:25 Receiver AM TA7642
9:53 KiWiCo Sponsor

source

33 thoughts on “Building a Super Simple AM Radio Transmitter & Receiver! Keeping Wireless Audio Communication easy!

  • June 13, 2021 at 5:32 pm
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    Shades of listening to Short Wave on my Radio Shack 65 in 1 kit

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  • June 13, 2021 at 5:32 pm
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    Hello Scott I wanna know can a charged capacitor covered in epoxy hold charge forever
    Also what if I took a coil with its one end connected to ground and another kept open ,then use a magnet to generate voltage in coil will it work

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  • June 13, 2021 at 5:32 pm
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    Can you please make a introducing guide to the hc-05, how to connect it to your phone and some arduino commands for that?

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  • June 13, 2021 at 5:32 pm
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    For anybody wanting to learn more, the amateur radio relay league (arrl.org) has tons of great information on their site about how to design transceivers. They also have information on how to get ham certification inside the United States, which is required if you want to be able to transmit over any significant distance

    Reply
  • June 13, 2021 at 5:32 pm
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    TA7642 IC is what replaced the old ZN414 a.m. radio chip? – that was in a TO92 case too, I still have a couple in my parts bin.

    Reply
  • June 13, 2021 at 5:32 pm
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    Nice transmitter, but how to amplify the ERP (effective radiation power) to like 10 or 20 Watt?

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  • June 13, 2021 at 5:32 pm
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    Next project make an LW transmitter than can be transmitted across the world

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  • June 13, 2021 at 5:32 pm
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    Yes because we are capable of our own networks. Right now Pakistan is limiting people's cell phone coverage to only those who are vaccinated so having such independent Is critical for speech free. It is also off their grid and connection to the Internet of all things.

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  • June 13, 2021 at 5:32 pm
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    Which software do you use for making those circuits which you showed?? Is it LTSPICE??

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  • June 13, 2021 at 5:32 pm
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    looks like both 555 methods are creating 100% AM modulation. the xr2206 had a much better mod signal on the scope.

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  • June 13, 2021 at 5:32 pm
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    Nice video. I really enjoyed this video. My suggestion is to use wegstr pcb milling machine to get a very nice circuit within less time.

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  • June 13, 2021 at 5:32 pm
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    Hallo, Ich bedanke mich für deine viodes. Könntest du mal ein Video für ein gebrochenes LCD TV machen . Wie könnte man motherboard (controller) von dies benutzen. Falls LCD Bildschirm gebrohen ist, TV wird es man wegschmeisen müssen. Gibt es einen Weg dass man die Komponenten benutzen könnte?

    Reply
  • June 13, 2021 at 5:32 pm
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    Amazing video as always , will you try FM transmitters too? Thanks again , i learned a lot

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  • June 13, 2021 at 5:32 pm
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    Went back in time to 1980s with my crystal radio receiver…..

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  • June 13, 2021 at 5:32 pm
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    looks nice, how much power draw your test AM-Radio pcb? i would like to build one for my mother if an emergency happens, she can listen to radio when power grid fails.
    maybe you can write me the values for the Receiver volt? Milliampere?

    Reply
  • June 13, 2021 at 5:32 pm
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    Just in time, I was struggling to build an AM radio!!

    Y'all can also try this project from Doctor Volt, it requires only an Arduino to generate AM signal: https://www.instructables.com/AM-Transmitter-With-Arduino/
    The carrier frequency is a square wave created from dividing the 16 megahertz clock signal, and the audio is encoded by PWMing.

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  • June 13, 2021 at 5:32 pm
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    you can also use a crystal oscillator used for microprocessor clocks in the 80s to make a transmitter as it contains the entire oscillator.

    also as more and more of the analog fm broadcasters go digital there will be the space opening up and the fcc may soon care less about the part 15 rules unless your transmitter should somehow cause a pacemaker to malfunction and cause a heart attack or completely drown out emergency responder communications.

    Reply
  • June 13, 2021 at 5:32 pm
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    I'm glad we're going from STEM to STEAM, arts are important and can be a great part of science!

    Reply

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