Procedure

Summing Amplifier

• Initial circuit connections are given as per circuit diagram
• Set R1 = R2 = R3 = Rf = 1k ohms.

• Vary the input voltages V1 , V2 , V3 from 0 to 10 V , such that all the voltages are connected at the inverting terminal.

• Simulate the circuit and find the output voltage Vo.
• Tabulate the readings in a table

Subtracting / Differential Amplifier

• Initial circuit connections are given as per circuit diagram
• Set R1 = R2 = R3 = R4 = 1k ohms.

• Vary the input voltages V1 , V2 from 0 to 10 V, such that V1 is at the negative terminal and V2 at the non-inverting terminal.

• Simulate the circuit and find the output voltage Vo.
• Tabulate the readings in a table