Merit Descriptors Indicative Characteristics Contextualised Evidence. In order to achieve a Merit the learner must: The learners evidence shows: To achieve the grade you will need to. M2 - Select/design and apply appropriate methods/techniques. The design methods/techniques have been justified. Build a crystal oscillator circuit in the lab and fully document the changes you have made to the circuit. Distinction Descriptors Indicative Characteristics Contextualised Evidence. In order to achieve a Distinction the learner must: The learners evidence shows: To achieve the grade you will need to. D2 - Take responsibility for managing and organising activities. Autonomy/independence has been demonstrated. Demonstrate to your tutor you have completed Task 2 independently. TASK INTRODUCTION TASK 1: LO4.1 (Describe the circuit conditions and methods used to achieve sinusoidal oscillation) For the oscillator circuit shown below, you need to explain the operation of the circuit. Your explanation for the oscillator must cover the following: 1) What every component and every stage of the oscillator circuit does. 2) A sketch of the output waveform with a full explanation. 3) What applications this oscillator circuit can be used for. TASK 2: LO4.2 (Build and evaluate a sine wave oscillator to a given specification) Part A: Design an audio-frequency oscillator based on a linear integrated circuit amplifier and a Wien feedback network. Your oscillator should meet the following specification: Amplitude of oscillation in the range of 8 to 12 volts Student 1 2 3 4 5 6 7 8 9 Frequency of Oscillation 600Hz 700Hz 800Hz 900Hz 1.1kHz 1.2kHz 1.3kHz 1.4kHz 600Hz Part B: Build your oscillator using simulation software and explain how it achieves the required frequency and amplitude of oscillation. Part C: Build your oscillator in the electronics lab (33B) using RS proto boards and explain how it achieves the required frequency and amplitude of oscillation. Part D: Write a report on your findings, highlighting any differences found between your theoretical design (simulated) and physical (actual) design produced. Opportunity for Distinction (D2) You will need to demonstrate to your tutor you have completed Parts A to D independently. TASK 3: LO4.3 (Explain the advantages of crystal-controlled oscillator circuits) For the oscillator circuit shown below, you need to explain the operation of the circuit. Your explanation for the oscillator must cover the following: 1) What type of oscillator the circuit is. 2) What every component and every stage of the oscillator circuit does. 3) A sketch of the output waveform with a full explanation. 4) A detailed discussion of the advantages of crystal oscillators. 5) What applications the oscillator circuit can be used for. Opportunity for Merit (M2) Build the oscillator circuit shown above on RS proto boards in the electronics lab (33b) and take measurements. You will need to fully justify any changes you make to the circuit.