EX_4_ADDER CIRCUIT BY USING OP-AMP

IN THIS EXPERIMENT I WILL TRY TO MAKE ONE ADDER CIRCUIT BY WHICH WE DO ADDITION OF ANY TWO OR MORE THEN TWO SIGNALS. IN THIS ADDER CIRCUIT I USED OPERATIONAL AMPLIFIER AS MAIN COMPONENTS,AND AS A INPUT I TAKE TWO SIGNALS, IN THIS OP-AMP USED INVERTING OP-AMP CONDITION. IN WHOLE EXPERIMENT I USE FOLLOWING THIGS: 1] OP-AMP 2] RESISTORS 3] CONNECTORS 4] GND 5]I/P SIGNALS ETC.......