Build these fun projects: An FM Xtal Set, A Crystal Headphone from a Cat Food Can, The Den Two Crystal Radio, From Crystal Set to Superhete, The Simple TRF Set, Flame Detector for the Xtal Set, The Foxhole Set, TRF Receiver Using the ZN414, WWII Underground Xtal Radio, Capacitance of the Parallel Plate Capacitor, How to Make a Double Crystal Receiver, A J-Fet Shortwave Regenerative Receiver and more.