Modular Analog Synthesizer - MIT · 2014. 4. 17. · Synthesizer Lauren Gresko Elliott Williams...
Transcript of Modular Analog Synthesizer - MIT · 2014. 4. 17. · Synthesizer Lauren Gresko Elliott Williams...
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Modular Analog Synthesizer
Lauren Gresko
Elliott Williams
Elaine McVay
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What is a Analog Synth?• First Purely Electronic
Instrument
• Collection of modules
• Produce, Modify, and Control Music Signals
• Unlimited Sounds
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Why Build an Analog Synth?• Resurgence in Popularity
• Introduction to Music Engineering
• Interesting Application of a Wide Range of EE Concepts
• Personal Interest
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Overall System Design
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Signal Processing System
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Signal Processing Modules• Controller
• Voltage Controlled Oscillator
• Voltage Controlled Filter
• Voltage Controlled Amplifier
• Envelope Generator
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Module I/O Signal Types• Music Signal
• -5V to +5V
• Control Signal
• Gate, Trigger, Envelope
• 1V per Octave
• 0 to +5V
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Example Patch
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The Power Amplifier ● Gain of 4.5● Bandwidth of 20Hz - 20kHz● High Slew Rate, Maintain Linearity, Stability,
Low Distortion
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Class G Amplifier● Utilizes two sets of supply rails in the output
stage, reducing the power consumption but maintaining linearity.
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Input Stage• Allows for feedback from the
output, improving linearity.
• Slew Rate is determined in the
Input Stage: ICC/Cdom.
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Voltage Amplifying Stage•Need to set the dominant pole (Cdom). Bandwidth = gm1/(2*pi*Cdom*gain).
•Want open loop gain to fall below unity before enough phase accumulates.
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Class G Output Stage
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Output Network, FeedbackPossible Feedback Adjustment Output
Network
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AC/DC Power Supply
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Bridge Rectifier Voltage RegulatorSmoothing Capacitor
+/-25V
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Specifications + ChallengesSupplying [email protected]
Supplying 15V@4A
Limited selection of transformers
Voltage drop of Regulation Circuitry
Heatsinking
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+/-15V & +/-10V Voltage Regulator
Bridge RectifierSmoothing Capacitor
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Timeline• Week of the:
• 3/31- Design modules
• 4/7 - Breadboard + Test
• 4/14 - Finalize Designs, Order Parts + Testing
• 4/28- Order parts and a PCB + Build Controller, Power Supply, and Amplifier
• 5/5 - Test + Construct PCB + Integrate
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Conclusion• An Analog Synthesizer is a fun
project that will provide us with valuable experience in addition to a nice final product.