四環電阻色碼計算器 https://www.digikey.tw/zh/resources/conversion-calculators/conversion-calculator-resistor-color-code
ThinkerCAD Circuit電路模擬實驗 https://www.tinkercad.com/dashboard?type=circuits&collection=designs
Block Circuit EDIT https://www.block.tw/bce/
DigiKey繪製電路圖 https://www.digikey.tw/schemeit/project/
Part 1/4: http://youtu.be/CBDxfBPteeY
Part 2/4: http://youtu.be/P3YwDwoQIb4
Part 3/4: https://youtu.be/8MGFKys7yXs
Part 4/4: https://youtu.be/9sxPk61XP_Q