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Project Improvement Ideas. Brian Drost Bangda Yang. Project Improvements. Printed Circuit Board Enclosure Automatic Gain Control Increase Maximum Load Power Increase Efficiency Decrease THD Digital Audio Input Wireless Transmission. Printed Circuit Board. Goals:

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project improvement ideas

Project Improvement Ideas

Brian Drost

Bangda Yang

project improvements
Project Improvements
  • Printed Circuit Board
  • Enclosure
  • Automatic Gain Control
  • Increase Maximum Load Power
  • Increase Efficiency
  • Decrease THD
  • Digital Audio Input
  • Wireless Transmission
printed circuit board
Printed Circuit Board
  • Goals:
    • Design a PCB for your amplifier
  • Advantages:
    • High probability it will work
    • Good experience for senior design
  • Disadvantages:
    • Costs some money
    • Need to know how to use the CAD software
printed circuit board4
Printed Circuit Board
  • Assistance
    • Seminar tonight on using PADS (CAD tool for PCB)
  • Logistics
    • PCBs could be combined into one panel to save money
    • Need to finish design early so the PCB can be fabricated before the end of the term (expect 8-10 business days including shipping)
enclosure
Enclosure
  • Goals:
    • Design and build an enclosure for the amplifier & speakers
  • Advantages:
    • Good experience for senior design
  • Disadvantages:
    • Costs money (a lot of $ if you’re not careful)
    • More of a mechanical engineering project
enclosure6
Enclosure
  • Assistance
    • Seminar sometime on using SolidWorks
  • Logistics
    • Can be built on 3D printers
    • Fabrication time is around 3 days but can get busy
discrete transistor feedback
Discrete Transistor Feedback
  • Goals:
    • Improve the design using feedback
    • Greatly improved THD (< 1%)
    • Precise gain (no dependence on ϐ)
    • Must be stable
  • Ideas:
    • Talk to TAs
  • Allowed Components:
    • Same as for prototype
automatic gain control
Automatic Gain Control
  • Goals:
    • Eliminate output dependence on input amplitude
    • Speaker volume does not vary with computer volume
  • Ideas:
    • Need to detect signal power (multiplier)
  • Allowed Components:
    • Opamps
    • Analog Multipliers
increase maximum load power
Increase Maximum Load Power
  • Goals:
    • Max. load power >0.75 W per channel
  • Ideas:
    • Differential output stage
    • Increase supply voltage
  • Can run off power supply rather than USB
increase maximum load power10
Increase Maximum Load Power
  • Load power calculations:
differential output stage
Differential Output Stage
  • Goals:
    • Use two output stages differentially to increase output swing
    • Load power > 0.75 W
  • Allowed Components:
    • Opamps
    • Power transistors
increase supply voltage
Increase Supply Voltage
  • Goals:
    • Use a DC-DC converter to increase the supply voltage
    • Load power > 0.75 W
  • Allowed Components:
    • Opamps & Oscillators (LM555)
    • Inductors
    • Power transistors
differential output stage13
Differential Output Stage
  • Goals:
    • Use two output stages differentially to increase output swing
    • Load power > 0.75 W
  • Allowed Components:
    • Opamps
    • Power transistors
class d amplifier
Class D Amplifier
  • Goals:
    • Create a class D amplifier that meets the specs
    • Power > 0.5 W
    • Efficiency > 70%
    • Both channels should be able to run on USB
  • Allowed Components:
    • Opamps & Oscillators (LM555)
    • Power transistors
digital audio signal
Digital Audio Signal
  • Goals:
    • Audio is transmitted digitally to the amplifier
  • Ideas:
    • UART
    • USB (complicated)
  • Allowed Components:
    • Integrated components for digital-audio conversion (microcontrollers, DACs)
wireless transmission
Wireless Transmission
  • Goals:
    • Receive audio wirelessly OR
    • Transmit audio wirelessly
  • Ideas:
    • Investigate AM or FM transmission/reception
  • Allowed Components:
    • Integrated components (except for radio chips)
project improvement list
Project Improvement List
  • Printed Circuit Board
  • Enclosure
  • Discrete Transistor Feedback
  • Automatic Gain Control
  • Increase Supply Voltage
  • Differential Output Stage
  • Class D Amplifier
  • Digital Audio Input
  • Wireless Transmission