They are quite simple, but there isn't much AM transmission any more so you wouldn't have much to receive unless you also build a transmitter. http://www.elect

They are quite simple, but there isn't much AM transmission any more so you wouldn't have much to receive unless you also build a transmitter. http://www.electroniccircuitsdesign.com/radio-circuits/shortwave-radio-receiver-circuit.html http://www.electroniccircuitsdesign.com/radio-circuits/short... This one works with shortwave. https://anarchy.translocal.jp/radio/micro/howtosimplestTX.html https://anarchy.translocal.jp/radio/micro/howtosimplestTX.ht... This is a simple transmitter.