ECGR2252 “Electrical Engineering Design I” Department of Electrical & Computer Engineering UNC Charlotte, Spring 2010 Mini-Project 3 (10 pts) Due 11:00am on March 25, 2010 Team assignment for UNCC Teams 1, 2, 3, 4, 5, 6 and WCU Teams 1, 2 Design of a “60Hz-Activated” Toggle AC Power Switch: 1. Study the National's LM2907 frequency-to-voltage converter. Setup the test circuit for the "Minimum Component Tachometer" shown on the datasheet excluding the output BJT (take your output from Pin 3). Examine the input/output behavior of this IC. Obtain an experimental plot of the output voltage versus input frequency from 0 Hz to a frequency beyond fmax. Use a function generator in place of the “Variable Reluctance Magnetic Pick Up” to provide the necessary inputs. 2. Using a frequency-to-voltage converter, an edge-triggered flip/flop, a solid-state relay, and passive components, design an AC power switch that toggles once each time a proper 60Hz input signal is applied and removed. Build and test your design. Demonstrate the operation of your design prototype with LED load to your instructor before the due date. Team leaders, please submit your team’s report that includes the following in the order shown: a) Names of all team members with * next to your own name, and percent effort from 0 to 100% next to each name. b) For Part 1, the schematic (i.e., the designed circuit drawing that shows all the details including the actual part numbers & passive component values with tolerances used in the lab). (0.5 pt) c) For Part 1, your table and plots of the theoretical and experimental data obtained in Part 1. Show a sample calculation for the theoretical data (2 pts). d) For Part 1, your discussions of the discrepancies between the experimental plot and the expected theoretical plot. (1 pt) e) For Part 2, the schematic (i.e., your complete detailed design that shows the actual part numbers & passive component values, including tolerances, used in the lab). (1.5 pt) f) All design calculations for Part 2. (2 pts) g) For Part 2, a sheet signed by your instructor (or instructor’s designee) as the verification that your design in Part 2 has worked in the lab. (3 pts)Submission: Your report must be typed using a word processing software. The first page should include ECGR2252 “Electrical Engineering Design I” – Spring 2010 Mini-project 3 - Design of a “60Hz-Activated” Toggle AC Power Switch Team # Names (BSEE, BSCpE, or both) % effort Turn in hardcopies of your report in class on March 18. Also, upload an electronic copy of your report into the assignment dropbox in Blackboard before 11:00am on March 18. Submit this as a single PDF file names “Team number-MP3”. Submission Policy: Late submissions will be accepted up to 5 business days but 10% will be deducted for each day that a submission is late. Lateness policy applies to electronic submissions as well. All electronic submissions with a time-stamp that is later than 11:00am of the due date will be considered late. 50% will be deducted for any submission that is not organized according to the numbering (a) through (g) above. Hardcopy of each team’s report is to be submitted by the team leader. Individual grades will be assigned based on percent effort as judged by the team leader. A grade of “0” will be assigned to any team member whose name is not written on the first page by the team