Electrical Arc Speaker

3D Printing
Arduino
PCB
Enclosure

The purpose of this project is to create an electrical arc speaker capable of playing the Oregon State Beaver Fight Song pre-recorded on a microSD card when a button is pressed. Ideally, the project will sit in the Kelley Engineering Center main office as a point of interest to people entering. Since it will be placed in a public location, the internals of the speaker will be visible from the outside, so that people will be able to see the arcing electricity that plays the music. The electrical arc speaker system consists of three main blocks: audio input, safety detection, and audio modulation with power amplification. The audio input will be set up on an independent module and will be provided with Bluetooth and SD card two input options. Safety detection consists of two parts, microprocessor sensor and code. It will conduct temperature detection and provide monitoring services based on each IC and voltage regulator in the circuit. The audio modulation system converts the audio signal into a PWM signal, and the power amplification system is responsible for amplifying the input PWM signal and making it have enough power to drive the high-voltage transformer. The audio input and audio modulation modules will be set up independently in the two PCB boards and communicated via the AUX cable. Throughout this project, we have had our fair share of accomplishments and challenges. A couple of notable accomplishments for this project includes completing the project earlier than expected and without any extreme difficulties being present. A few challenges that we had run into included volume issues, not being able to do one PCB for the whole system, and not being able to keep the project to a smaller size.

3 Lifts 

Artifacts

Name Description
Class_D amplifier individual Class_D audio preamplifier with TL494 chip. Zip file includes PDF schematic and Altium PCB file.   Download
Power Supply Input 24V-DC and output 12V and 5V DC with 7812 and 7805 regulators. Zip file includes PDF schematic and Altium PCB file.   Download
Class_D amplifier combination Include audio preamplifier with TL494 chip and full-bridge amplification circuit. Zip file includes Altium schematic and PCB file.   Download
Executive Summary The executive summary file of the electrical arc speaker   Download
Project closeout Project closeout document. Includes project description, risk register, team timeline, project impact assessment, project engineering requirements, and future recommendations.   Download
Microcontroller code Program to monitor the temperature of the system and shut it down if needed.   Download
Project Summary Video Summary video of the project includes system introduction, demonstration, achievements, and challenges.   Link