Introduction BD139, BD139 pinout, BD139 applications, BD139 as a switch, BD139 as amplifier, BD139 arduino interfacing, BD139 Departments:Electrical EngineeringElectronics EngineeringMechatronics EngineeringComponents:BD139Softwares:ProteusHello friends, I hope you all are doing great. In today's tutorial, we are gonna have a look at detailed Introduction to BD139. BD139 is a Bipolar NPN transistor, it is mounted in the SO ...