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Create acceptor radio

This video is sponsored by KiWiCo As you probably know I created a couple of projects about wireless audio communication over the years. And the newest ones were Walkie Talkies for which I firstly tried using an nRF24 for the wireless communication part. But that turned out to be a total disaster, so next I used generic RF modules in order to transmit my voice through the air which worked out quite a bit better. Nevertheless though; my main point here is that both of those approaches require lots of components and good electronics knowledge so they are kind of complicated. But why not just keep it simple for a change and think back to the good old times in which we used such old school radios for getting information through the air. In my case I want to keep it as simple as possible by focusing on AM radio communication which stands for Amplitude Modulation. But why is that simpler than FM you might ask, which by the way stands for Frequency Modulation. Well as a practical example; my radio in AM mode can pick up when I am turning on my lights; So creating a suitable signal with a transmitter should not be too hard if a simple light switch already sends something similar out. And when it comes to AM receivers then you can find builds on YouTube which only consist of a coil and a diode and they work; So how hard can it be to create something a bit better? Well, we are about to find out in this video in which I will do a couple of circuit experiments in order to ultimately show you how to create a simple but functional AM transmitter and receiver. Let’s get started! First off, since I already got an AM receiver to work with let’s rather focus on the AM transmitter for now. Before that though we need to understand what kind of signal we have to send out. An AM signal basically consists of a carrier sine wave which gets modulated by an audio signal which can be for example music or my voice but to keep this example simple it will also be a sine wave for now just with a lower frequency than our carrier wave. And according to the label of my radio the carrier frequency should be between 520kHz and around 1.6MHz. Now simplified speaking, the process of amplitude modulation increases or decreases the amplitude of our carrier wave according to the amplitude of the audio signal. Thus the send out signal could look something like this and it contains all the information of our original audio signal which can then be extracted at the receiver station. So obviously we need some kind of oscillator circuit that creates a suitable carrier wave that we can then modulate with firstly a function generator for testing and afterwards with a microphone circuit. And the first component that came to my mind when hearing oscillator...