engineer.amir@hotmail.com
Newbie level 4
Below is the circuit diagram in which I am having the PNP switching problem. PNP keeps ON the seven segments and doesn't perform switching. I have changed the Emitter to Base resistance and controller to base resistance either but still not effective. Where is the problem ....???? I have also used the ULN2803 between MCU and Transistor to ensure the proper sink and source but that was also useless..... any comments that may help me out ????
View attachment seven seg PNP.bmp
View attachment seven seg PNP.bmp