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Class Note for ECE 1100 with Professor Chen at UH


Class Note for ECE 1100 with Professor Chen at UH

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This 8 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Houston taught by a professor in Fall. Since its upload, it has received 15 views.

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Date Created: 02/06/15
ECE 1100 Introduction to Electrical and Computer Engineering Fall 2008 Professor Ji Chen ECE Dept Notes 14 Crystal Radio Principles Crystal Radio Schematic Antenna Inductor Variable Capacitor Diode 1 N34A HighImpedance Earphone Resonant Circuit Resonant frequency Inductor L Henrys Capacitor C Farads Adjusting C allows you to tune the circuit to respond to a given frequency This uses the principle of resonance Amplitude Modulation Field transmitted from transmit antenna ml lt1 mt audio message signal voice MU Audio message signal f r x A High frequency signal 0 broadcast from antenna q 0 t Your ear cannot hear suchasignal Detection The diode only allows current to flow in one direction sinusoidal signal from receive antenna t earphone LowPass Filtering Peak of signal vt quot 0 Average value of signal VA 2 proportionaltothe amplitude t The total rectified signal red part consists of a sum of two parts 1 The average vAl 2 A highfrequency part that has a zero average value LowPass Filtering cont k m naan r MOM VHU t I ln n n t LowPass Filtering cont Your ear cannot respond to the highfrequency signal it is beyond the frequency range of human hearing or the DC offset Human hearing range 20 Hz 20 kHz 7710 Audio message signal lV


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