I think I agree with you (Mr Karas), because if
one of my prototype works at home, it doesnt work
at my office. I brought it again to my home, it
doesnt work any more at home. Especially if the
mC outputs were used to switch some relays.
I was thinking that the power circuits bring some
noise from the out let, but not; because the same
case happen even if the Lab. power supply is used
[Leader or Philips products].

Would you please suggest me how to over come the
problem?, and please tell me the long story as
you promise. Perhaps the story can inspired me
an idea to put some thing in the circuits.

Any way, thank you very much. I will try to do
some thing related to your explanation.

I still expecting some comments from the 8052 boards,
please.