lab 12 - Matt Weiner Phys. 241 11/19/06 Lab 12 Crystal...

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Matt Weiner Phys. 241 11/19/06 Lab 12 Crystal Radios and LRC Circuits Part 2 Goal: To use an LRC circuit to build a crystal radio Introduction: To design a basic crystal radio you need a simple LRC circuit that can be tuned for an AM signal know as the AM band. Tuning the signal basically finds the best resistance, R , capacitance, C , and inductance, L to make the LRC circuit function to its maximum efficiency. Due to the fact we are dealing with AM signals we want to find the frequency so we know from the previous lab that resonant frequency is simply: LC 1 = ϖ (1) Procedure: III. Choosing an inductor for the LRC circuit For this part of the lab we will find the calculated and measured Inductance of the circuit. We will measure the peak resistance and voltage. Then with a graph of the inductive reactance, X L vs. ω and the slope of that line is the inductance. Data: For a 100 resistor Period (T) Frequency ω V peak,R V peak,L X L .00165 606.1 3808 1.75 v 20 mV 1111.111 4 10 8 - x
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lab 12 - Matt Weiner Phys. 241 11/19/06 Lab 12 Crystal...

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