Electronic Music Box

By

Timothy Goloviznin

This project named: “Electronic Music Box '' will produce a four channel musical device of two pulse wave channels, one triangle wave channel, and one noise channel. This device consists of the music player as one PCB with each individual channel as separate PCBs and songs being pre-encoded within additional circular circuit boards. The Design is similar to a record player with the encoded pcb rotating around on top of the music player with each channel’s Tone / Frequency being controlled by voltages levels. For the circular PCB, resistors will be placed radially for each channel and a brush connection will be made as the disk rotates and completes the circuit per channel and in turn makes a sound as long as the circuit is complete. Engineering Requirements: -This device will be able to produce 4 channels consisting of two pulse wave channels, one triangle wave, and a noise channel. - This device will be powered by a 5.0V +- 0.5V micro-usb cable. - This device will be able to have interchangeable “music disk” PCB’s and be able to play different songs per disk. -9 out of 10 users after using the system for 15 seconds report that “the speaker could be heard from 1.5’ away”

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Artifacts

Name Description
Music Player PCB This PCB is the base for the electronic music box, containing the power supply, 4 channel mixer as well as the main brush contacts containing voltages levels for all voltage controlled channels for the pulse, triangle, and noise PCBs.   Download
Encoded Music Disk PCB This PCB contains the 20 radial channels with different voltages levels for the Music player to read as this disk is spun.   Download
Pulse and Triangle Wave Generator PCB This PCB uses a Schmitt trigger as a base to produce a sawtooth wave, which is then processed with op-amps to produce either a voltage controlled pulse or triangle wave with adjustable frequencies and pulse width.   Download
Noise Channel PCB This PCB Produces a voltage controlled noise channel with pink, white, and blue noise outputs.   Download
System Requirement #1 Proof This video will Prove System Requirement 1: "This device will be able to produce 4 channels consisting of two pulse wave channels, one triangle wave, and a noise channel". This will be done by Showing each input separately via a oscilloscope as well as both pulse waves together to show there are in fact two pulse wave channels. Finally all four channels will be shown at once through the Mixers output via the oscilloscope as well as a speaker.   Link
System Requirement #2 Explanation This document provides an explanation on System Requirement #2: "This device will be powered by a 5.0V +- 0.5V micro-USB cable" and why this requirement in the end was not meet.   Link
System Requirement #3 Proof This video will prove System Requirement 3: " This device will be able to have interchangeable “music disk” PCB’s and be able to play different songs per disk". This will be done by first showing a music disk playing on this system via a speaker and then the process of removing and adding a new music disk, as well as playing the new music disk to show the system operating properly.   Link
System Requirement #4 Proof This Document will prove System Requirement 4: "9 out of 10 users after using the system for 15 seconds report that “the speaker could be heard from 1.5’ away”. This was done by surveying 10 people and having them place a music disk onto the system, turning on the System, and then stepping back 1.5 feet. After this, each person filled out the survey of their experience with the system.   Link
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