Appendix D2 Experiment EB2: IC Multivibrator Circuits. Lab Report (Submit your report on the same day immediately after the experiment)
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1 EEE1026 Electronics II Appendix D2 : IC Multivibrator Circuits Lab Report (Submit your report on the same day immediately after the experiment) Name: Student I.D.: Date: Majoring: Group: Table No.: 4. Astable 555 Timer V CC(meas) = V [1 mark] Table 4-1: Astable Operation for various R A and R B R A (k ) R B (k ) For R A = 100 k, R B = 10 k case (Step 9): V out (max) = V V out (min) = V V pin 6 (max) = V V pin 6 (min) = V f cal D cal T W f D V CC(meas) V out (max) = V V pin 6 (max) / V CC(meas) = V pin 6 (min) / V CC(meas) = Graph 4-1: Astable Operation for R A = 10 k, R B = 10 k [3 marks] [7 marks]
2 Graph 4-2: Astable Operation for R A = 10 k, R B = 100 k Graph 4-3: Astable Operation for R A = 100 k, R B = 10 k * Note: Ask your instructor to verify your results before you proceed to Part B. Signature: Time: Remarks Page: 2
3 B. Monostable 555 Timer V CC(meas) = V Table 4-2: Monostable Operation for various R R (k ) W cal W [1 mark] [3 marks] For R = 68 k case (Step 7): V pin 6 (max) = V V pin 6 (min) = V V pin 6 (max) / V CC(meas) = [3 marks] Graph 4-4: Monostable Operation for R = 33 k Time base : s/div, CH1 (V pin 2 ) : V/div, CH2 (V out ) : V/div CH2 CH1 * Note: Ask your instructor to verify your results before you proceed to Part C. Signature: Time: Remarks Page: 3
4 C. Voltage-Controlled Oscillator V CC(meas) = V [1 mark] Graph 4-5: Voltage-Controlled Oscillator at minimum frequency T W = s = s V pin 6 (max) = V V pin 6 (min) = V V pin 5 f D = V = Hz = % [5 + 7 marks] Voltage-Controlled Oscillator at maximum frequency T = s W = s V pin 6 (max) = V V pin 6 (min) = V V pin 5 f D = V = Hz = % [7 marks] * Note: Ask your instructor to verify your results. Signature: Time: Remarks Page: 4
5 Discussion A. Astable 555 Timer 1. Explain the difference between the calculated f cal and the measured f. 2. Compare the calculated D cal to the measured D, and justify their difference. 3. Identify how the voltages V out and V pin 6 are related in the three graphs. 4. Compare between voltages V CC(meas) and V out (max) and explain their difference. 5. Evaluate how W L, f and D changes when R A and/or R B are varied. Propose the expected minimum and maximum duty cycle values. [15 marks] B. Monostable 555 Timer 1. Identify how the voltages V out and V pin 3 are related in the three graphs. 2. Describe how W changes when R is varied. [6 marks] Page: 5
6 C. Voltage-Controlled Oscillator 1. With the help of Figure 1 and Figure 3, compare and evaluate the relationships between voltages V pin 6 (max) and V pin 5, as well as V pin 6 (min) and V pin 5. Include numerical calculations in your answer. 2. Describe how W, f and D changes when the value of V pin 5 is varied. 3. What is the voltage at pin 6 before the output of a monostable 555 timer changes from ON state to OFF state? Why? 4. Why does the trigger pin 2 is pulled low only for a short period of time? How long can pin 2 be maintained at low? What will happen if pin 2 is kept low indefinitely? [11 marks] Conclusion [15 marks] Page: 6
7 EEE1026 Electronics II STUDENT'S NAME: ID NO: SUBJECT CODE AND TITLE: EEN1026 ELECTRONICS 2 EXPERIMENT TITLE: EB1 - FET Amplifier Frequency Response EXPERIMENT DATE: Criteria 1 (Need Improvement) 2 (Satisfactory) 3 (Good) 4 (Excellent) Data Collection and Setting up the Experiment 1 Ability to construct the Unable to construct the Able to construct the Able to construct the Able to construct the amplifier amplifier circuit on the amplifier circuit, and not amplifier circuit amplifier circuit. circuit correctly, with neat and breadboard asking for help. partially. tidy placement of components and jumper wires 2 Ability to set-up the power supply for the circuit, the function generator to the amplifier and to connect the oscilloscope to display the waveform 3 Ability to extract the midband amplifier's characteristics. 4 Ability to extract the amplifier's complete frequency response. 5 Ability to answer the questions in by Oral Assessment Unable to setup the DC or AC input to the amplifier, and not asking for help. No voltage gain is observed, and not asking for help. There is no difference between the low-, midand high-frequency response of the amplifier. Not able to answer the question, no attempt was made to answer Able to setup the DC and AC input to the amplifier partially. Analysis and Conclusions No voltage gain is observed, but the waveforms are approximately at opposite phase. Minor differences between the low-, midand high-frequency response of the amplifier. Able to answer questions with some basics answers and demonstrate some attempts to refer to the text books, notes, lab sheet DC and AC input to the amplifier is correctly setup. Voltage gain is more than unity, with the input and output at approximately opposite phase. Low-, mid- and highfrequency response of the amplifier shows some deference. Able to answer most part of the questions, with some explanations and elaborations and demonstrate some attempts to refer to text books, notes or lab sheet TIME: DC and AC input to the amplifier is correctly setup and the waveforms are visible in the oscilloscope. The voltage gain is fair, with the input and output at opposite phase. Low-, mid- and high-frequency response of the amplifier is clearly seen on a graph. Answered all correctly with proper explanations and elaborations, without a need to refer to any references. Rating Awarded by Assessor
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