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Adana Science and Technology University Department of Electrical and Electronics Engineering Electrical Circuit Lab Term Project Active Low-Pass Filter 1. INTRODUCTION In this project, you are going to design an active Low-Pass Filter circuitry. A low-pass filter is a filter that passes signals with a frequency lower than a certain cut-off frequency and preventing the passage of signals with frequencies higher than the cut-off frequency [1]. The most important feature of a low pass filter is that the cut-off frequency and gain of the filter can be adjusted by designer. Filter circuits are used in a wide variety of applications such as telecommunication, image processing, speech processing, etc. There are many methods for designing low-pass filter but here we focus on method which uses opamps. This circuit is composed of an operational amplifier, capacitor and resistors. 1.1 Design Criteria’s Design an active low pass filter based on the chosen cut-off frequency (150Hz-200Hz) and available values of resistors and capacitors. Gain of the filter can be chosen arbitrarily but it should be suitable with your design specifications. 2. Rules and Regulations During the project, you may use any types of resistors, capacitors, and op-amps. Other circuit components and integrated circuits are not allowed to use during the implementation phase. The project will be carried out in groups of two students. 2.1. Preparation In the preparation part, each group is required to present a proposed design solution for the project in a report (pre-report). The report should also include simulation results illustrating the operation of the circuit used in the design. The necessary calculations for each step (for example, resistor and capacitor values) should be described in the report clearly. The deadline for submitting the pre-report will be announced. Please ask the laboratory assistant about the date. Late submissions will be penalized. 2. 2. Implementation and Demonstration In the implementation part, you will physically construct your circuit. All team members must attend the construction together. The attendance will be considered during the lab performance grade. You must provide your pots, etc.) and bread-board. own circuit components (op-amps, resistors, capacitors, NOTE: During the project you are going to submit two reports. In the pre-report you are required to give the main blocks of your design with their schematics and simulation results. The second one is the final report which contains information below. 3. Final Report The final report should include of the experiences gained during the project. the final design, results, and a summary NOTE: The objectives, results and the experiences should be presented clearly. This does not mean a long report, but definitely a well-organized one. The final report should contain the following sections: 1. Abstract and Introduction 2. Theory 2.1. Selection of equipment such as resistors, capacitors, inductors, op-amps etc. 2.2. Working principle of the project 3. Schematic diagram of the circuit 4. Simulation results 5. Description of circuit operation: Both theoretically and experimentally 6. Comments and conclusions ATTENTION Cheating is strongly forbidden and will be severely punished. Each project can be implemented in many different ways. Hence, it will be easy to detect similarities. This does not mean that you cannot collaborate with your friends. However, the allowed form of collaboration is exchanging the ideas, not duplicating the design details. References [1] https://en.wikipedia.org/wiki/Low-pass_filter