I'm wondering about DC offsets, and why they happen when certain signals are added together. I've noticed that in some cases the offset is positive and in others it is negative, and I'm wondering why this is. Is there any hard and fast rules about how offsets are created? I'd like to know when I'm adding signals together without having to test with scope~.

Hi, 
I'm wondering about DC offsets, and why they happen when certain signals are added together.  I've noticed that in some cases the offset is positive and in others it is negative, and I'm wondering why this is.  Is there any hard and fast rules about how offsets are created?  I'd like to know when I'm adding signals together without having to test with scope~.
,Bye


dc offset