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ELE 291 – Electrical Fundamentals Laboratory I Pre-Lab 8 – July 17, 2015 Replacing an Inductor with an Op-Amp Circuit Name: _____________________________ Date: _______________________ Introduction: Inductors are a useful component when building filters. Unfortunately, real inductors suffer from several disadvantages. These include size and cost. Audio systems need inductors much larger than the 10 mH inductors that we used in the previous lab. A 1 H inductor will cost several dollars and weigh on the order of one pound, precluding its use in audio systems. Fortunately, we can build a simple circuit that performs the same as an inductor using an op-amp, two resistors and one capacitor. In this lab we will build this circuit and verify that it behaves like an inductor. Part 1: Build the following circuit on Multisim. This circuit emulates a 100 ohm resistor in series with a 1 H inductor. For the input use a low frequency square wave (1 Hz). Use transient analysis to observe the response of the circuit. XSC1 G T A B C D XFG1 R1 100 Ω U1 C1 100nF OPAMP_3T_VIRTUAL Op Amp Circuit that emulates an inductor. R2 100kΩ Use the formula τ = L/R to determine the theoretical decay time. Does the circuit give the expected response? Theoretical τ = ______________ Measured τ = ________________ Part 2: The equivalent circuit is given below. Build this circuit and compare the response of this circuit to the op amp circuit. That is measure τ. R3 100 Ω Equivalent Circuit L1 1H R3 = R1 L1 = R1*C1*R2 Measured τ = ________________________