WCU ECGR 2252 - ECGR 2252 Mini-Project 5 (2 pages)

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ECGR 2252 Mini-Project 5



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ECGR 2252 Mini-Project 5

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Pages:
2
School:
Western Carolina University
Course:
Ecgr 2252 - Electrical Engineering Design I

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ECGR 2 25 2 El ec t rica l E ng i n e er i ng D e si gn I De pa r tm e n t of El ec t ric a l C om pu t e r E ng in e e ri n g UN C Cha rl o tt e S p ri ng 201 0 Mini Project 5 10 points Due 11 00am on May 4 2010 Design of a Sound Ultrasound Activated Toggle Switch Consider the band pass filter BPF and voltage amplifier shown below which is designed by cascading low pass and high pass filters LPF HPF 1 Perform an AC Analysis from 100Hz to 1MHz using OrCAD and a decade sweep Plot the magnitude of the overall transfer function U1B OUT Vmic and label the center frequency point on this plot with its coordinates 2 Replace the ac source labeled Vmic with an electret microphone and build this design in the lab Pull up the electret mic with a 2 2K resistor Connect the output of this BPF voltage amplifier to the input of a properly designed FVC toggle circuit Refer to Mini project 3 Whistle into the mic and make sure the load toggles on and off use a visible LED as the load Modify this design in the lab as needed for tuning it to the input signal you plan to use in your final product R10 U1B8 R7 10k Vs 5Vdc 5 R9 U2A8 3 R8 10k C7 1u OUT 2 0 C1 C3 10k R1 LM358 V R2 0 R3 1 OUT 6 0 01u 4 V V 1k V 10k 4 7 V LM358 0 R4 10k 50mVac 0 01u 1k 10k C4 C2 1Vdc Vmic 330p 330p 0 Team leaders please submit your team s report that includes the following in the order shown a The plot obtained in Part 1 Write down the values of the center frequency and the overall gain at the center frequency 2 pts b Design calculations for R1 and C1 of the FVC circuit 2 pt c The schematic of your design including the FVC and load circuit that includes all the details and shows the actual part numbers passive component values including tolerances used in the lab 3 pts d A sheet signed by Dr Miri Dr Yanik or designees as the verification that your design has worked in the lab for the designed sequence and defined motion 3 pts Submission Your report must be typed using a word processing software The first page



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