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Unformatted text preview: Birzeit University Physics Department Physics 112 Experiment No.9 Filters Students Name: Rafat tomeh Students No.: 1040985 Partners name: Qais sabbah Partners no : 1031001 Section: 4 Instructor: Dr. Ziyad Izzat Abstract: The aim of the experiment :  is to check the output voltage of lowpass and highpass filters to find 3dB , and also to know how to use the lowpass filter as a differentiator and the highpass filter as an integrator. Method used: is by constructing an RC circuit and measure the output voltage for different frequencies. The main result : The theoretical value of 3dB is 10 kHz and the experimental value of 3dB is 10.05 kHz. The graphs that we obtained from the oscilloscope are in results and conclusion's part. Theory : Low Pass Filters It can be proved easily that for the circuit in figure 1: V out (t) = V in (t) / (1 + j RC) After some treating it becomes 2 2 2 1 ) ( ) ( C R t V t V in out + = The attenuation factor A, is defined as 2 2 2 1 1 ) (...
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 Spring '10
 ommaya

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