Question

1. Design a circuit from figure 1, in Multisim. Use 1309 op-amp if it is available. If not, then LM358. Datasheet for LM358 is provided below. Note that it is a bit different from the one that we used in lab, since –Vss can be grounded for 358, and for ours 1309 it doesn’t work in that way. a. What type of amplifier is this? How that amplifier operates? b. What is the voltage gain and what is determined by it? c. Measure the Vout at Wheatstone bridge, measure Vout at op-amp. Record measurements in table below. c) V_bridge, V_op_amp; d) V_potentiometer; e) V_bridge, V_op_amp, V_potentiometer d. Add a 1 k? potentiometer in parallel with one bridge resistor. Measure the voltage across potentiometer and its parallel resistance. Is it higher or lower that the rest of the bridge circuit? Why is it so? e. Change the value of potentiometer and measure Vout at bridge, at op-amp and across potentiometer and its parallel resistance, for three different values. Record measurements in table. LM358 datasheet R1=R2=R3=R4=320 kOhm Rin=1kOhm Rf=4kOhm f. Import a printoff of Multisim circuit containing voltmeters for one measurement.

          1. Design a circuit from figure 1, in Multisim. Use 1309 op-amp if it is available. If not, then LM358. Datasheet for LM358 is provided below. Note that it is a bit different from the one that we used in lab, since –Vss can be grounded for 358, and for ours 1309 it doesn’t work in that way.
a. What type of amplifier is this? How that amplifier operates?
b. What is the voltage gain and what is determined by it?
c. Measure the Vout at Wheatstone bridge, measure Vout at op-amp. Record measurements in table below.
c) V_bridge, V_op_amp; d) V_potentiometer; e) V_bridge, V_op_amp, V_potentiometer
d. Add a 1 k? potentiometer in parallel with one bridge resistor. Measure the voltage across potentiometer and its parallel resistance. Is it higher or lower that the rest of the bridge circuit? Why is it so?
e. Change the value of potentiometer and measure Vout at bridge, at op-amp and across potentiometer and its parallel resistance, for three different values. Record measurements in table.
LM358 datasheet
R1=R2=R3=R4=320 kOhm
Rin=1kOhm
Rf=4kOhm
f. Import a printoff of Multisim circuit containing voltmeters for one measurement.

1. Design a circuit from figure 1, in Multisim. Use 1309 op-amp if it is available. If not, then LM358. Datasheet for LM358 is provided below. Note that it is a bit different from the one that we used in lab, since –Vss can be grounded for 358, and for ours 1309 it doesn’t work in that way.
a. What type of amplifier is this? How that amplifier operates?
b. What is the voltage gain and what is determined by it?
c. Measure the Vout at Wheatstone bridge, measure Vout at op-amp. Record measurements in table below.
c) Vbridge, Vopamp; d) Vpotentiometer; e) Vbridge, Vopamp, Vpotentiometer
d. Add a 1 k? potentiometer in parallel with one bridge resistor. Measure the voltage across potentiometer and its parallel resistance. Is it higher or lower that the rest of the bridge circuit? Why is it so?
e. Change the value of potentiometer and measure Vout at bridge, at op-amp and across potentiometer and its parallel resistance, for three different values. Record measurements in table.
LM358 datasheet
R1=R2=R3=R4=320 kOhm
Rin=1kOhm
Rf=4kOhm
f. Import a printoff of Multisim circuit containing voltmeters for one measurement.

Added by Danielle W.

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