My Projects

Spring 2023

10-Band
Audio Equalizer

My 10-band audio equalizer was born from an electronics class project. Me and my classmate Justin Craven designed, tested, and built a complete audio equalizer. We both focused on the design of the 10 Butterworth filters. While Justin focused on building and designing on breadboard, I focused on PCBA, 3d modeling, 3d printing, and PCB testing.

Fall 2023

Solar Cell Characterizer

This project was developed as part of the ‘special topics’ course at CSU-Chico. I communicated with the faculty on different potential projects, and landed on this solar cell characterizer project working with Dr. Meehan, due to my newfound love for power electronics as well as analyzing analog signals. The finished project is intended for the chemistry department, where they are developing organic solar cells. My project plots the IV curve of these cells at a specified temperature and light level to verify their achievements. My project is based on a custom PCB that I designed, and later revised, as well as Peltier modules for temperature control. The improved PCB is an Arduino shield to reduce complexity and solves all major issues with the former.

Spring 2024

Audio Equalizer v2

This is an update to the original audio equalizer, fixing multiple issues that appeared after testing.

New features added:

  •  Battery operated
  • 20% smaller
  • Higher audio quality
  • On/Off switch

Bugs fixed include:

  •  Buffer resistors to prevent shorting
  • More efficient routing of traces
  • Curved edges for better DFM
  • SMD IC’s to improve space efficiency
Spring 2024

Spotify to Youtube Music Converter

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Spring 2024

Planar Magnetic Speaker Driver

This is my current working project, along with soldering and debugging the v2 EQ. this project will assist me in my goal of developing my own custom set of active noise cancelling headphones from scratch. The system uses 14 bar magnets in parallel, along with a Flex PCB with a coil traced on as my diaphragm. Currently developing the 3d printed housing of the driver for my fist test. 

Fall 2024

EMG Signal Analysis

This project was designed to predict the hand motions of the game ‘rock paper scissors’ using EMG signal analysis processed by MATLAB. I utilized digital filters, more specifically a fourth-order IIR Chebychev lowpass filter implemented through MATLAB.

 

Utilizing a bandpass filter would have been more efficient for removing low-frequency noise, however acceptable results were achieved with a lowpass filter as most of the noise was high-frequency.

 

As hardware was not the focus of this project, I utilized an Arduino UNO for data acquisition through the unfiltered port of the SparkFun EMG sensor. The results of the ADC were sent via serial communication to my laptop, where I read the output using RealTerm and saved it to a CSV for processing in MATLAB.

Fall 2023

Two Stage Bipolar CE Amplifier

A multistage bipolar CE amplifier is an amplifier designed out of BJT transistors cascaded together to achieve a larger gain than a single transistor amplifier. The emitters of the transistors share a common emitter node to provide a desired output characteristic. This essentially means that the emitter on the BJT 1 an BJT 2 are connected through a wire, as well as a coupling capacitor.

 

This project was a lab for our Electronics 1 course at CSU Chico.

 

Fall 2023

Differential Amplifier

The differential amplifier is one of the fundamental building blocks of analog electronic circuits that I learned about in my undergraduate career. A differential amplifier is a type of amplifier that takes the difference between two input signals and amplifies them while rejecting common mode signals present in both signals. This second property is especially useful when dealing with noise or any kind of interference. In this lab, I investigated the properties of differential amplifiers. I also investigated different configurations of these amplifiers, such as adding a common sinusoidal fluctuating source to the base of each transistor to act as noise. Through the process of this experiment, I assessed the advantage and disadvantages of the differential amplifier.

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