Using the ULN2003A Transistor Array with Arduino
TheULN2803Aisahigh-voltage,high-currentDarlingtontransistorarray.ThedeviceconsistsofeightnpnDarlingtonpairsthatfeaturehigh-voltageoutputs ...,TheULN2803Acomprisessevenhighvoltage,highcurrentNPNDarlingtontransistorpairs.Allunitsfeatureacommonemitt...。參考影片的文章的如下: