여러 광석 라디오

FM 광석 라디오

http://www.essentialtech.co.nz/content/crystal_sets

http://solomonsmusic.net/FM_CrystalRadio.html

http://theradioboard.com/rb/viewtopic.php?t=2856

http://theradioboard.com/rb/viewtopic.php?t=4297

http://billydiy.blogspot.kr/2013/06/fm-crystal-radio.html

DX 광석 라디오

http://www.ac8gy.com/crystal.html

(EOM)