lab 11

# lab 11 - Matt Weiner Phys 241 Lab 11 Crystal Radios and LRC...

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Matt Weiner Phys. 241 11/14/06 Lab 11 Crystal Radios and LRC Circuits Part 1 Goal: To understand how the crystal radio and an LRC circuit function. Specifically the resonance of the LRC circuit. Introduction: The main section of a crystal radio circuit is the LRC circuit. In the experiment we will be looking at the resonance of the LRC circuit. Resonance occurs in an LRC circuit when the capacitive reactance, X c , equals the inductive reactance, X L . Using the following equations: ϖ L X C X L C = = 1 (1) If the tow reactances are added together the resonant frequency will be: LC resonance 1 = (2) Procedure: Set up the oscillator and the LRC circuit shown in figure 2: I. Finding the resonant frequency Using the set up of fig. 2 first calculate the resonance frequency ω calculated , and then measure the resonance frequency. Use the oscilloscope to find the period for each inductance/capacitance combination and then use that to find the resonance frequency, ω res .

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Data: R/C ω
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lab 11 - Matt Weiner Phys 241 Lab 11 Crystal Radios and LRC...

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