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DESIGN REVIEW: THE LIGHT LISTENER

DESIGN REVIEW: THE LIGHT LISTENER. Justin Manuel Rivera Bergonio 12 December 2013 PHYS 475 / Professor Varner. Motivation/Fun Facts. Human eye can detect: Light changes of 0.02 s f < 50Hz Human ear can discern f between 20Hz to 20,000 Hz Objective(s):

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DESIGN REVIEW: THE LIGHT LISTENER

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  1. DESIGN REVIEW: THE LIGHT LISTENER Justin Manuel Rivera Bergonio 12 December 2013 PHYS 475 / Professor Varner

  2. Motivation/Fun Facts • Human eye can detect: • Light changes of 0.02 s • f < 50Hz • Human ear can discern • f between 20Hz to 20,000 Hz • Objective(s): • Make audible these fast pulses • Make audible other “invisible” light sources

  3. Light Listener Circuit +9V • Detector/receiver(?) • IR Phototransistor • Signal Amplifier • 741 Op Amp • Audio Amplifier • 386 Audio Op Amp • Fixed Gain: 20 • Speaker • 8Ω Mini Speaker 1μF 100kΩ 0.1μF 100kΩ 741 8Ω 100μF 0.1μF 10kΩ 386 From: Forest M. Mims III Enegineers Mini Notebook

  4. Timeline • Progress: • Gather materials • Construct light listener circuit • Tested light listener circuit • Further (Possible) Implementations • On/off switch for power supply (by 12/13/2013) • Counter with Display (by 12/16/2013) • Stop/Start/Reset • Used in tandem with a stopwatch  get frequencies • Output sound to earphones?

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