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Learn how to create a light listener circuit using simple components for detecting fast light pulses and invisible light sources to make them audible. Follow a timeline to gather materials, construct and test the circuit, and explore possible implementations like adding a counter with display. Experiment with integrating a stopwatch to measure frequencies and consider outputting sound to earphones. Enjoy the fun facts related to human eye and ear capabilities!
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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): • Make audible these fast pulses • Make audible other “invisible” light sources
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
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?