I hope the following simulation is what you need!
You can use sliders to change R1,R2, Vin.
Click invert to find the circuit type similar to your case!

/htdocs/ntnujava/ejsuser/2/users/ntnu/fkh/operationalAmplifier_pkg/operationalAmplifier.propertiesFull screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
Download EJS jar file(1060.5kB):double click downloaded file to run it. (26 times by 18 users) , Download EJS source View EJS source