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Lab 3 - RC Filters

Lab 3 - RC Filters - San Jos State University 1 Department...

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San José State University Department of Mechanical and Aerospace Engineering RC Filters 9/30/08 Report Author: Lab Date: 9/23/08 Summary This report introduces resistors and capacitors along with the concept, construction of an RC filters. After building up all the necessary wiring connection on the breadboard, ATmega 128 microcontroller with the program, there was no time to achieve the function of the tweeter. The AVR HyperTerminal output is missing in the report. It was a program gliche. ________________________________ Results/Discussion To test RC Low-pass filter, the function generator and the oscilloscope are connected to a breadboard circuit set up with resistor and capacitor as the following figure. After constructing the circuit with the termination in the menu of function generator for High Z, amplitudes of V o are recorded with the input of frequency as in the following table. V 0 Measurements for Single Stage RC Low-pass Filter Circuit 1
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San José State University Department of Mechanical and Aerospace Engineering It is distinctively observed that the (V 0 ) value of transfer function decreases as the frequency of the input voltage increases. Our values for the output is higher than the input, acting as an amplifier, which did not make sense. Moreover, the ratio of input and output voltages ( V 0 / V i ) is indirectly proportional to the magnitude of the transfer function ( V 0 ) .
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