Hi in this tutorial we will study how to implement an adder circuit using an opamp in gEDA software. You can learn more about gEDA http://www.geda-project.org/ . The supporting files of this tutorial is available at https://groups.google.com/forum/?fromgroups=#!topic/fisatecminipro/QfeC-b215rg and https://groups.google.com/forum/?fromgroups=#!topic/fisatecminipro/car893MM4hs
