12. LED の点灯・点滅
LED の電流制限抵抗の導出法
http://bake-san.com/led012.htm
LED 点灯
http://circit-e.com/004.html
http://www.ele-lab.com/led_kairo1.html
http://luminescence.o-oku.jp/denshi_kairo2.html
LED 点滅
http://www.zea.jp/audio/tled/tled_01.htm
http://www.zea.jp/audio/ledt/ledt_01.htm