Problem with 16F877A but not with 16F876A

[savnik]

Hi, Savnik

did you verify the quiescent state collector voltage meets PIC input specs ???

I feel the problem in the Trans. hfe and not in the Pic ....

Alain

I use BF199 and not 2N3904(as show at picture).
The same circuit work on 16f876a.
I believe the problem is with the configurations