回覆 8# 綠袖子
5mm LED 都有分普通亮度同 super/ultra bright (留意以下 photo下面嘅 description):
http://weclonline.com/tchi/produ ... 2&display=photo
"普通亮度" 指電器紅/綠指示燈嗰 D.
5mm super/ultra bright 嘅 LED 都要用 20mA推; White LED 要~3V, Green/Red 要 2~2.3V. CR2032 都未必頂得好耐.
FYI, "按一下著按一下關" circuit:
http://electronics.stackexchange ... ch-control-a-toggle |