Introduction to bd138, bd138 pinout, bd138 power ratings, bd138 applications Departments:Electrical EngineeringElectronics EngineeringMechatronics EngineeringComponents:BD138Softwares:Proteus Hi Guys! Hope you’re well today. I welcome you on board. In this post today, I’ll detail the complete Introduction to BD138. BD138 is a PNP transistor that is incorporated in audio amp ...