Objective
To design a summing amplifier using OP – AMP and verify its function.
Components
Operational amplifier
Resistors (1kΩ, ½ W; 10kΩ , ¼ W(3nos))
Fixed power supply (±14 volts)
CRO probes (6 number)
Bread board
Hook up wires
Dc power supply
CRO
Function generator
Digital Multimeter
Resistors (1kΩ, ½ W; 10kΩ , ¼ W(3nos))
Fixed power supply (±14 volts)
CRO probes (6 number)
Bread board
Hook up wires
Dc power supply
CRO
Function generator
Digital Multimeter
Theory
SUMMING AMPLIFIER
In summing amplifier each input adds a voltage to the output multiplied by its separated constant gain multiplier. If more inputs are used, they each add an additional component to the output. A circuit having three input amplifier\er circuit which provides a means as algebraically summing three voltages, each multiplied by a constant gain factor.
Vo = -( Rf V1/R1 + Rf V2/R2 + Rf V3/R3)
In summing amplifier each input adds a voltage to the output multiplied by its separated constant gain multiplier. If more inputs are used, they each add an additional component to the output. A circuit having three input amplifier\er circuit which provides a means as algebraically summing three voltages, each multiplied by a constant gain factor.
Vo = -( Rf V1/R1 + Rf V2/R2 + Rf V3/R3)
Procedure
1. Connect the circuit as shown in figure with required power supply.
2. Connect the positive terminal of all three power supply to three resistors each of 10kΩ and ground the negative terminal.
3. The circuit shows a three input summing amplifier circuit which provides a means as algebraically summing three voltages, each multiplied by a constant gain factor,
Vo = -( Rf V1/R1 + Rf V2/R2 + Rf V3/R3)
2. Connect the positive terminal of all three power supply to three resistors each of 10kΩ and ground the negative terminal.
3. The circuit shows a three input summing amplifier circuit which provides a means as algebraically summing three voltages, each multiplied by a constant gain factor,
Vo = -( Rf V1/R1 + Rf V2/R2 + Rf V3/R3)
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