inputs.text: disillusioned - bachelor science electrical engineering one greatest gifts led direction crystal radio set received one christmas back late 1970s turn pass thing son christmasi chose pay little get set prewound coil hardest part building one kits one kits would relatively easy build 4 main components coil diode ear piece variable capacitor could go wrongthe mechanical connections important electronics electrons never fail always mechanical joints connections kit twisttogether first failure grabbed soldering iron made sure connections goodthis kit not work perhaps diode bad dont know trying get work twice sons attention already starting fade made no progress much passing along spark wont buy one 3 daughters thats sure