Guitar Amplifier with Analog/Digital Effects (Senior Design Project Fall/2013)
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Transcript of Guitar Amplifier with Analog/Digital Effects (Senior Design Project Fall/2013)
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Guitar Amplifier with Analog/Digital Effects
(Senior Design Project Fall/2013)
Group 5 Members:Alex Chen
Audrey HernandezBrittany Delose
Robert John
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Motivation● Explore music and technology
● Have analog and digital effects
● User control
● Produce a quality output for the musician and listeners
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Objectives
● Amplifier housing is easily moveable
● Controlled output power
● Quality output that is low noise over a wide volume range
● User controlled effect systems
● Wireless user interface
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SpecificationsOutput Power Rating 50 Watts
Frequency Response 5 Hz - 100 kHz
Total Harmonic Distortion (THD) 0.1% (1 kHz at 30 Watts)
Input Impedance 500 kOhms
Output Impedance 4 - 8 Ohms
Signal to Noise Ratio (S/N) 80 dB
Bluetooth Range ~10 Meters
Number of Analog Effects 6
Number of Digital Effects 7
Cabinet Size (H x W x D) 18” x 12” x 6”
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Block Diagram
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Analog EffectsSpecifications● +9V supply● .25 W 1206 Resistors● >= 16V electrolytic and
aluminum capacitors● Linear and Audio rotary Potentiometers
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The Fuzz Box
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The Fuzz BoxMMBT222A● NPN bipolar transistor● Low power amplification● Low current● High switching speeds● SOT-23 package
Potentiometers● 1 K linear (fuzz)● 500 K audio (volume)
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Big Muff
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Big Muff
MMBT5088● NPN general purpose amplifier● High gain● Low noise● SOT-23 package
Potentiometers● 2 100k Linear (Tone and Sustain)● 1 100k Audio (Volume)
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Distortion with Stutter
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Distortion with StutterLM386M-1● Low voltage● External gain of 200● Voltage range 4-12 V● Low quiescent current a mA● 8-SOIC
NE555DR● Precision timing oscillator● programmable duty cycle● Voltage range 5-15V● 8-SOIC
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Orange Squeezer
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Orange SqueezerMMBJF310● N-Channel JFET Amplifier● Voltage rated 25 V● Quiescent current 60 mA● SOT-23
TL072ACD● JFET input op-amp● low input bias● fast slew rate● 8-SOIC
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Octave Up
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Octave Up
N4148W● Fast switching speed● Fast reverse recovery● SOD-123 package
NE5532ADR● General purpose (pre) amplifier● Low level● Low noise● 8-SOIC
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Tremolo
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Tremolo
● MMBT3906● NPN Transistor● Ideal for medium power amplification● SOT-23
Potentiometers● 1 100 K Linear (Duty Cycle)● 1 100 K Audio (Volume)
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Digital Effects● TI’s TMS320C5515 eZdsp was the prototype board
selected● Digital effects algorithms designed on the prototype
board● PCB layout for the digital effects based off the prototype
board
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TMS320C5515 eZdsp
• TMS320C5515 16 bit fixed point DSP• TLV320AIC3204 for ADC and DAC conversions
48ksps• Eighth inch Stereo input and output jacks• USB 2.0• Interfaces with TI’s Code Composer Studio• Within budget
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Reverberation ● Reverberation works by adding the current
input to a delayed output
● There are two main parameters to the effect, the depth and size of the reverberation array
● Depth determines amount delay of the signal that is added to the input
● The size of reverberation array determines the amount of the previous signal is saved
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● The fuzz effect compares the guitar input to three conditions
● If the input between a parameter +X and -X passed through
● If the input is less than -X it is set to a fixed value - Y
● If the input is greater than X is it set to +Y
Fuzz
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Echo● The echo effect works by adding the
current input to a delayed input
● There are two main parameters to the effect, the depth and size of the echo array
● Depth determines amount delay of the signal that is added to the input
● The size of the echo array determines the amount of the previous signal is saved
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Tin Can
● This is a highly treble sounding effect
● The treble and the bass components of signal are separated
● Higher frequencies passed
● Low frequencies are filtered by downsampling
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Phase
● This effect works by varying the size of delay between values in a buffer array
● The size of the buffer and the amount of maximum delay are the two main parameters
● The guitar input and the delayed value are both down sampled then upsampled when returned to main
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Robot
● A sine wave is generated then it is multiplied with the guitar input
● The frequency of the sine wave can be increased or decreased to modify the effect
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Fuzzy Tube
● The modulation is between the guitar input and a modified sine wave
● The sine wave is modified by setting it’s amplitude to a respective fixed amplitude
● When the sine wave is positive and negative it’s fixed to its respective values
● The sine wave becomes clipped
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User Interface• Netbeans IDE
-Free, open-source, growing community of users/developers
• Select between 7 effects, modify certain parameters
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User Interface● Reverb effect
- Update button notifies DSP- To change to another effect, current window must be closed- Only the main window will close application
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Bluetooth Evaluation Boards
● PAN1323ETU
- Plugs directly into the MSP430F5430 Experimenter Board
- BT stack provided free - Matching P1/P2 pinouts- Contacted SSO; BT stack not developed for the TMS320C5515ezDSP
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Bluetooth Evaluation Boards● RN-42-EK
- Embedded BT stack (CSR BlueCore-04)
- FT232RQ - 4 configuration switches - PCB trace antenna - 3Mbps Data Rate - Baud Rate - Error correction,
auto-discovery/pairing, auto-connect master
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Plan for GUI/DSP
● Usb4java -Serial port emulation
● DSP Bootloader -Flash new code
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Pre AmplifierFunctions ● Prepares signal for
further amplification● Provides necessary
voltage gain ● Controls the volume
and equalization● Cleans up a signal by
eliminating high frequency noise
Advantages of Op Amps over Discrete● Components matching● High CMRR● High gain● Lower power consumption● Simplicity● Low cost
TI’s high precision low noise OPA134 was selected.
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Pre AmplifierBlock Diagram
● Band pass filter obtains range from 5 Hz to 1 MHz● First stage and second stage Op Amps each provides about
voltage gain of 10 ● “Tone stack” equalization circuit for low, mid, and high tone
control. ● Volume control is done by adjusting the input of second stage
Op Amp
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Pre AmplifierSchematic
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Pre AmplifierFrequency Response and Distortion
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Pre AmplifierPCB Layout and 3D View
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Power AmplifierFunctions● Provides high current gain ● Provides enough output power to drive a speaker
Design ConceptA 50W output power amplifier for an 8 Ohms speaker requires:
Vrms = 20V, Vpeak = 28V, Irms = 2.5A, Ipeak = 3.5A
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Power AmplifierBlock Diagram● Differential circuit w/ constant current source for input stage● Common emitter amplifier for middle stage● Class AB in Darlington pair for output stage● Circuit protection for short load● No IC’s used for more control and high current requirements
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Power Amplifier
Schematic
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Power AmplifierFrequency Response and Distortion
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Power AmplifierPCB Layout and 3D View
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Power SupplyFunction● Converts 115VAC to DC’s needed for the project● Filters out as much AC ripples as possibleOutputs● 30 VDC for power amplifier module● 15 VDC for pre amplifier module● 9 VDC for analog effects module● 5 VDC for digital effects module
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Power SupplyBlock Diagram
● Center tapped with secondary output 24VAC and power rating of 100VA transformer
● 100V/4A full wave bridge rectifier● Simple RC filter● LM78XX and LM79XX voltage regulator IC’s
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Power SupplySchematic
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Power SupplyPCB layout and 3D view
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Distribution of Workload
AnalogEffects
DigitalEffects
User Interface Bluetooth Pre Amp &
Power AmpPower Supply
CabinetAssembling
Alex
Audrey
Brittany
Robert
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Budget and Financing
Estimate Total: $850
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Progress
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Successes and Difficulties Successes● Satisfied SPICE simulation results on all modules● Successful digital effects coding on DSP
evaluation board● Board design and layout for analog effects● More than half PCB’s on order
Possible Difficulties● Noise resistance● Implementation of boards in cabinet● DSP/GUI interfacing
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Plan for Success
● Have all PCBs completed by mid October● User interface and bluetooth functioning by
late October● Cabinet and housing done by late October● Presentation finalized by November 10, 2013
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Questions?