This weekly report discusses progress made on a project to develop a food spoilage detection platform. Modifications were made to address comments from a previous presentation. A diode was added to the charger circuit to protect the switching transformer when unplugged. Additional functions were also added, including an LED to indicate when batteries are charging by comparing the output voltage to a reference voltage. Both the modified charger circuit and switching transformer were installed inside the platform. While this integrated the components, a weakness is that the enclosed platform lacks ventilation, which could cause high temperatures. The next steps are to prepare materials for an upcoming presentation.
This weekly report summarizes the progress of an engineering student group working on a product design called P'Jub. The student tested a new charger circuit for their battery by decreasing the charging current to 300mA, which helped reduce the temperature of an LM317 component. The student designed a PCB board for the circuit, assembled it, and retested it. Strengths included cooling the LM317 and adjusting current flow. A weakness was unstable contact between the platform and body. The next week's task is to complete an English report.
This weekly report discusses progress made on a project to develop a food spoilage detection platform. Modifications were made to address comments from a previous presentation. A diode was added to the charger circuit to protect the switching transformer when unplugged. Additional functions were also added, including an LED to indicate when batteries are charging by comparing the output voltage to a reference voltage. Both the modified charger circuit and switching transformer were installed inside the platform. While this integrated the components, a weakness is that the enclosed platform lacks ventilation, which could cause high temperatures. The next steps are to prepare materials for an upcoming presentation.
This weekly report summarizes the progress of an engineering student group working on a product design called P'Jub. The student tested a new charger circuit for their battery by decreasing the charging current to 300mA, which helped reduce the temperature of an LM317 component. The student designed a PCB board for the circuit, assembled it, and retested it. Strengths included cooling the LM317 and adjusting current flow. A weakness was unstable contact between the platform and body. The next week's task is to complete an English report.
This document summarizes the key topics covered in Chapter 5 of the Signals & Systems course, which analyzes linear time-invariant (LTI) systems using time-domain and frequency-domain techniques. The chapter covers stability analysis using the impulse response and Routh-Hurwitz test, analyzing step responses for first-order and second-order systems, and the frequency response of LTI systems to sinusoidal and periodic inputs. Examples are provided to illustrate these time-domain and frequency-domain analysis methods.
This chapter discusses representing systems using transfer functions. It covers obtaining the transfer function by taking the Laplace transform of the input-output differential equation. Transfer functions allow representing systems in the frequency domain. Key concepts covered include poles and zeros of a system, frequency response functions, and practical passive filters using resistor-inductor-capacitor components. Transfer functions of interconnected systems are also addressed.
This chapter discusses sampling and signal reconstruction from samples. It introduces the sampling theorem which states that a signal must be sampled at a rate at least twice its highest frequency component to avoid aliasing. It describes how to reconstruct the original signal from its samples using an interpolation formula. It also discusses the effects of undersampling and oversampling, and how aliasing can occur if the sampling rate is too low.
The document summarizes key concepts about the Laplace transform. It defines the Laplace transform, discusses properties like linearity and time shifting. It provides examples of taking the Laplace transform of unit step functions. It also covers computing the inverse Laplace transform using partial fraction expansion and handling cases with repeated or complex poles.
1. The weekly report summarizes work on improving a battery charger circuit. Issues with high temperatures in the previous LM317 circuit were addressed.
2. A new charger circuit was designed with current limiting using RV2 and automatic output voltage adjustment using BC337.
3. Next steps include testing the new charger circuit, designing an alarm for low 7806 output voltage, and designing a new PCB for the charger circuit.
The weekly report summarizes the work done on designing a power supply circuit. Key points:
- The student designed a charger circuit using an LM317 regulator to charge a 1500mAh 3.7V LI-PO battery within 60 minutes.
- Testing showed regulators 7806 and 7805 can generate stable 6V and 5V outputs with input voltages above 7.2V and 7V respectively.
- Issues identified were the LM317 running hot during charging and output voltage drops of 7806 below 6V at lower inputs.
- Next steps are to improve charging circuit and add an alarm for low 7806 output.
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