Why is it that the measure Vbe value is greater than .7V and not destroy the transistor? I also breadboarded it and the measureed value remain the same. Quite perflex that Vbe should be 0.7V for silicon.

 

Welcome to AAC.
Perhaps this article will explain things for you.

 

hi,
Look at this Vbe plot
E

 

You don't show enough of your schematic to know what is going on.

For silicon, the junction areas are typically sized so that, at the range of currents the device is designed to handle, the junction voltage is about 0.7 V. That is not some rigid, fixed constant. Change the temperature, and the junction voltage will change (at the same current). Increase the voltage and the current will increase. Decrease the voltage and the current will decrease. Depending on the specific transistor and temperature, you can see Vbe down around 0.5 V and up over 1 V, particularly in saturation.

 

Why is it that the measure Vbe value is greater than .7V

Because the bottom transistor is installed backwards. In real life you should never have more than -5V on the B-E. So you might have hurt the transistor.

The arrows should all point toward ground or negative.

 

Welcome to AAC!

Quite perflex that Vbe should be 0.7V for silicon.

What made you arrive at that conclusion? The junction behaves like a diode and doesn't have a definite on/off voltage.

Typical Vbe vs collector current and temperature data for Fairchild 2N3906:

 

Here is the complete schematics. I actually wired it and it worked but can't get ,<=0.7V Vbe.

 

Here is the complete schematics. I actually wired it and it worked but can't get ,<=0.7V Vbe.

Read post #5.

 

As already noted, your PNP transistor is backwards.

But even if you fix that, it still won't work correctly because the PNP transistor works by pulling current from the load, which means that the other end of the load needs to be at a higher potential than the PNP's collector. Power your circuit with +/- 10 V supplies, or put a 10 V source on the other end of your load resistor.

 

 

I missed the coupling capacitor in his output because it's covered by the popup,

 

Thanks everyone. I have had no issue with the totem pole arrangement; Vbe is always <=0.7V; just curious about the inverted PNP circuit to the point that I actually wired everything on my breadboard. But considering Ron's reply, I agree that it may not have much of practical and safe use.