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hello everyone and welcome to square-wave - I usually have a vintage shortwave receiver to show you something we call boat anchors but I dont have one today instead Id like to show you a little project I put together just for the fun of it it is a great-great Grandaddy to every radio receiver past present and future and here it is the famous crystal radio AM receiver this was absolutely state-of-the-art in 1920 it was just as remarkable to people in those days as the moon landing was to people in 1969 I think everyone knows that these radios operate without any visible means of support without any visible power supply there are no batteries no line cord to plug into the wall these little radios indeed work for free and I think thats probably why theyre so fascinating to many hobbyists today many people are billing these radios just look at the videos on YouTube well Im going to begin by showing you my front panel and explaining the controls what they do my radio has three control