豆コン

http://www.asahi-net.or.jp/~hp6y-isym/4stube_r.htm

https://search.yahoo.co.jp/search?p=%E8%B1%86%E3%82%B3%E3%83%B3&aq=-1&oq=&ai=vF8nd7bqR5W989wF5NCMpA&ts=3217&ei=UTF-8&fr=top_ga1_sa&mfb=2141_71c&x=wrt

豆コン = 豆 + コンデンサ = 마메콘.

豆 + condensor 의 줄임말 = 소형 콘덴서.

豆 = 콩알의~ = 소형의~