One transistor radio, now with pyrite detector diode (#Fossicked from #MineWaste at Unity Wood mine, #Cornwall). The pyrite seems to work just as well as the standard germanium one, it doesn't take long to fund a working junction on the crystal surface. #OrganisedAtoms

Single transistor AM receiver #OrganisedAtoms

AM transmitter, quite cheap, nasty and against the law. Range only about 5m though so no sweat. #OrganisedAtoms