I have a strangle thing happening to my circuit and wanted to know thoughts on what might be happening. I have a circuit with three PNP transistors and they all are behaving the same. The voltage on the emitter is 5V and while I'm not applying any voltage directly to the base of the transistor, I'm reading 4.4 V on the base. J2 is a six pin header and I haven't connected anything to it yet.
View attachment 215161

The base-emitter junction looks like a PN junction diode. The forward voltage of a silicon PN junction is about 0.6V.
Hence 5V - 0.6V = 4.4V which is exactly what you are seeing on a "floating" base.

Your DVM very likely has internal resistance of 10MΩ. When you connect the DVM between base and ground you are putting the emitter-base junction into forward bias with about 0.5μA.

Hi
I u could help me
I have voltage on base and collector of PNP transistor when i measured it but no voltage on emitter i need to know why there is no voltage

Moderator edit: New thread created from old thread.
https://forum.allaboutcircuits.com/...hen-no-voltage-applied-directly-to-it.172176/

 

Welcome to AAC!

You committed two sins on forum etiquette.
1) You posted on an old thread
2) You hijacked someone else's thread.

You need to post a circuit schematic so that we can visualize your personal issue, not someone else's problem.

 

Welcome to AAC!

I have voltage on base and collector of PNP transistor when i measured it but no voltage on emitter i need to know why there is no voltage

What are the voltages on the base and collector?

 

No schematic??