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MIT 6 002 - Study Notes

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Massachusetts Institute of TechnologyDepartment of Electrical Engineering and Computer Science6.002 – Electronic CircuitsFall 2005Lab 4: Audio Playback SystemHandout F05-058IntroductionIn this lab, you will construct, test and demonstrate the audio playback system which you designedin Homework #11. The lab consists of two parts: Pre-lab exercises and in-lab exercises; thereare no Post-lab exercises. You should complete the Pre-lab exercises in your lab notebook beforecoming to lab. Then, carry out the In-lab exercises between November 28 and December 9. Aftercompleting the In-lab exercises, have a TA check your work and sign your lab notebook. You mayhand in your lab notebook for grading at that time.Before asking to get checked off, make sure you meet all the requirements in thecheckoff list at the end of the In-Lab ExercisesNote that in addition to regular lab hours from November 28 to December 2, there will be staffavailable in the lab the following week (December 5 through 9) for checkoff. You will be notifiedas to the times in lecture and by email.Reminder: You must complete all of the labs. Failure to do so will result in adeduction of one full grade in the class, no exceptions. Your lab notebook must beturned in with all Post-Labs completed and you must be checked off for all the labs.Pre-Lab Exercises(4-1) Copy your design for the clock from Problem 1 of Homework #11 into your lab notebook.Label all resistor and capacitor names and values.(4-2) Next to your design for the clock, copy the graph from Part (E) of Problem 1 of Home-work #11 into your lab notebook. You will use this information to determine whether theclock you construct during In-Lab Exercise 4-2 works correctly.(4-3) Copy your design for the digital-to-analog converter from Problem 2 of Homework #11into your lab notebook. Label all resistor names and values.(4-4) Next to your design for the digital-to-analog converter, make a table showing the expectedconverter output vDACwhen each of the data-bit input voltages is 5 V and the others areall 0 V. Base the table on the actual resistor values used in your design. Also, note theexpected value of the offset voltage vOFFrequired to center the converter. You will use thisinformation to determine whether the converter you construct during In-Lab Exercise 4-4works correctly.(4-5) Copy your design for the low-pass filter from Problem 3 of Homework #11 into your labnotebook. Label all resistor and capacitor names and values.(4-6) Next to your design for the low-pass filter, copy the graph from Part (F) of Problem 3of Homework #11 into your lab notebook. Also, make a table showing the expectedmagnitude and phase of the filter output vLPFgiven a 2-V peak-to-peak sinusoidal inputwith a frequency of 4 kHz, 8 kHz and 16 kHz. Base the table on the actual resistor andcapacitor values used in your design. You will use this information to determine whetherthe filter you construct during In-Lab Exercise 4-6 works correctly.(4-7) Copy your design for the volume control stage from Problem 4 of Homework #11 intoyour lab notebook. Label all resistor and capacitor names and values.(4-8) Next to your design for the volume control stage, make a table showing the expectedmagnitude and phase of the volume control stage output vOUTgiven a 2-V peak-to-peaksinusoidal input with a frequency of 10 Hz, 100 Hz and 1 kHz. Base the table on theactual resistor and capacitor values used in your design. You will use this information todetermine whether the amplifier you construct during In-Lab Exercise 4-8 works correctly.In-lab ExercisesThe In-lab exercises involve constructing and testing the individual functional blocks of the audioplayback system, and then demonstrating the operation of the system as a whole.You will need to obtain the counter and memory printed circuit board (PCB) from the stock-room, along with a small speaker. Since there is a limited supply of circuit boards and speakersavailable, make sure you return the memory board and the speaker when you are not using them.The in-lab exercises are organized so that you will construct and test one functional block at atime. As each block is found to work properly, you will connect it to those which already working.Consequently, you will alternately construct and test various parts of the audio playback system.As you develop the system in this manner, it is essential that you turn off the powerto the protoboard before you make modifications to your system, or begin any newconstruction. Also, check your wiring carefully before turning the power back on. Thiswill avoid damaging the components in the system, and save you considerable debugging time.Finally, construct the functional blocks as compactly and neatly as possible. In this spirit, youshould find it easiest to use the components to wire themselves together, rather than using extrawires. This will save you considerable construction time, as well as considerable debugging time.(4-1) If you are working in a group of two, you should attach your two protoboards together.This will simplify the circuit assembly by providing more wiring space. To minimizewiring in this lab, the counter and memory have already been assembled on a printed-circuit board. On the back of this board are pins that will plug into the protoboards inthe Lab. Plug these pins into the protoboards so that each pin is inserted into a separateprotoboard row. Further, locate the board so that there is considerable protoboard spaceon the side with the memory output data bits. This will make connection to the boardeasiest. For example, locating the board towards the lower left corner of the protoboardmay prove best. The clock can then be constructed above the board, while the digital-to-analog converter, the low-pass filter and the buffer can be constructed to the right of theboard.Figure 1 shows the pin assignments for the printed circuit board. The pins for the eightmemory output data bits as well as the clock, power and ground pins are on the righthand side. You should connect the power pin to the 5-V power supply on the protoboard,and the ground pin to ground on the protoboard.(4-2) Following your design from Pre-Lab Exercise 4-1, construct the clock using the 74HC14inverter chip obtained earlier. Figure 2 shows the pin assignments for the inverter chip.Use any two of the inverters in the chip, and leave the others unconnected. Do not yetconnect the clock output vCLKto the clock input of the counter. Rather, use one


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MIT 6 002 - Study Notes

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