I am trying to build a basic 2 input summing amplifier using radio shacks 741 op amp. I have a feeling I damaged my IC chip through my wacky experimentation's. But lets run through the math just in case I am missing something. After all, I am new to this!
If I power the op amp with a voltage supply of +-5V and I set one input to 1.28V and the other input to 0 the voltage output should be -1.28V. Simple node voltage calculations and a PSpice simulation confirm this prediction. For some reason I am getting an output of 1.92 V without attaching anything to my inverted and non inverted inputs. So the 1.92 is coming directly from the supply. I was under the impression that the supply did not effect the sum. Where am I going wrong? Or is the chip busted, playing tricks and causing me severe electonxiety.
Any advice? Thanks in advance.
Turns out I can not add images, I am two points shy! Here is the link, sorry for the inconvenience.