# LAB - 2 FREQUENCY MODULATION

May 5th, 2015
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In this lab, you will learn how to perform the Frequency modulation using IC 566 and to calculate the modulation index for various modulating voltages.

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Lab ExperimentLAB - 2 FREQUENCY MODULATION2.1 OBJECTIVEIn this lab, you will learn how to perform the Frequency modulation using IC 566 and to calculate the modulation index for various modulating voltages.2.2 HARDWARE REQUIREDAFO, IC NE566, Resistors, Capacitor, CRO, Bread board and connecting wires, RPS2.3 PREPARATION (PRE-LAB)Do the complete revision of Frequency modulation and its modulation index and also about IC 566 working principles. 2.4 THEORY Frequency modulation is a process of changing the frequency of a carrier wave in accordance with the slowly varying base band signal. The main advantage of this modulation is that it can provide better discrimination against noise. 2.4.1 Frequency Modulation using IC 566 A VCO is a circuit that provides an oscillating signal whose frequency can be adjusted over a control by Dc voltage. VCO can generate both square and triangular Wave signal whose frequency is set by an external capacitor and resistor and then varied by an applied DC voltage. IC 566 contains a current source to charge and discharge an external capacitor C1 at a rate set by an external resistor. R1 and a modulating DC output voltage. The Schmitt trigger ci

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