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Download Laser Harp Digital instrument and Sound generation Adam Langoria Matthew Gann
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Transcript
Laser Harp Digital instrument and Sound generation Adam Langoria Matthew Gann System Overview • Laser Break Beam Sensors • R2R Digital to Analog Converter • Virtual Ground and power amplification Laser Break Beam Sensors • Laser Transmitter – 100Ω Current limiting resistor – Laser Diode – Culminating lens • Laser Receiver – 10kΩ pull up resistor – Active high design – NPN photo transistors R2R Digital Analog Converter • R2R Resistor Network – 20kΩ and 40kΩ values – Single Inline Package – 1% tolerance Virtual Ground and Amplification • Virtual Ground – Low Pass Filter • 10kΩ and 200μF • .08 Hz Cut Off Frequency • Follows the moving average voltage • Opamp to sink and source current • Amplification – Opamp • Unity Gain, gain of 1 • Used for isolation from R2R network • Can source and sink much greater current Laser Harp Digital instrument and Sound generation Adam Langoria Matthew Gann
