我想幫個平板加12粒橙3v LED
Power supply 就係用2A電(唔知應該用幾多粒....亦都係本文主要問題)
3V 橙LED個spec
就係3V, 20mA...就咁計, 粒LED就係150ohm
我想12粒LED 全數parallel 黎焊....
想問下我應該用幾多粒1.5V電先可以夠玩兩個鐘?
其實我應唔應該用parallel黎焊定係in series 好d (in series 好似易控制d)?
歡迎光臨 RC EVOLUTION - 遙控工房 - 香港RC遙控車討論區 (https://jk.rc-evo.com/xbbs/) | Powered by Discuz! X3.2 |