class-d garage band amplifier
DESCRIPTION
Class-D Garage Band Amplifier. Team: Aaron Danielson, Robert Mann, Randall Newcomb, Scott Russell Sponsor: Nigel Thompson. Overview. The Purpose of the Class-D Garage Band Amplifier Requirements and Stretch Goals System Concept System Block Diagram Sampling and Bitrate Constraints - PowerPoint PPT PresentationTRANSCRIPT
Class-D Garage Band Amplifier
Team: Aaron Danielson, Robert Mann,Randall Newcomb, Scott RussellSponsor: Nigel Thompson
OverviewThe Purpose of the Class-D Garage Band AmplifierRequirements and Stretch GoalsSystem ConceptSystem Block DiagramSampling and Bitrate ConstraintsTask BreakdownBudgetProject Schedule
Purpose
1. Class D Amplifier Power Efficiency2. Price Point 3. Open Source4. Customizability
Requirements
• An amplifier output will be driven by an FPGA• The output stage will be a PWM H-bridge amplifier • High quality audio• Low cost• High efficiency
• The power supply will be efficient and low cost• The amplifier will output more than 100W RMS• …Stretch Goals• An enclosure will be constructed to house the amplifier,
FPGA and speaker• A more power amplifier will be implemented
System Concept
Images from Google Image
System Block Diagram
Description of Major Tasks• Design a Top Level Testbench• Contains all the key modules that connect the DSP and PWM.• Implement microprocessor.
• Digital Signal Processor• Design 2 filters – one each for bass & treble.• Interface with LCD & rotary dial for user input.
• H-Bridge Controller• Design code to control H-bridge IC.• Integrate H-Bridge into FPGA clocking and control.
• Amplifier • Design an H-bridge.• Implement and test the amplifier
• Speaker Enclosure• Build the box• Shield the box for RF radiation• Design bandpass filters for the selected speaker
Bitrate & Sample Rate Comparison – CD Quality
Bitrate & Sample Rate Comparison – Low Sample
Rate
Bitrate & Sample Rate Comparison – Low Bit Depth
Bitrate & Sample Rate Comparison – A Good
Compromise
BudgetItem Our Cost Actual Cost
4x H-Bridge Amplifiers (free samples for dev) $0.00 $55.002x Spartan 3E FPGA (donation, borrowed) $0.00 $360.00Printed Circuit Board (donation) $0.00 $60.00Power Supply Components $50.00 $50.00Speaker Wire $10.00 $10.00 Speaker $40.00 $40.00 Speaker Enclosure $50.00 $50.00Miscellaneous $100.00 $100.00
Max budget with donations $1000.00 $1000.00Total $250.00 $725
Project Schedule