Build Your Own Working Crystal Radio Lab Kit - EDU-3010
I've been a ham radio operator for 23 years and have built many radio projects from scratch. I bought this kit to build with my almost-7 year-old because it was less expensive than obtaining the germanium diode and high-impedance earphones, the only parts I didn't have on hand to build a crystal set. It did work GREAT on the first try!<br />The advantage of this kit is that the big coil is already wound for you. Some kits use the little pre-wound ferrite bar coils but these lack the nostalgic visual appeal 