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DESIGN REVIEW: THE LIGHT LISTENER
Justin Manuel Rivera Bergonio 12 December 2013 PHYS 475 / Professor Varner
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Motivation/Fun Facts Human eye can detect: Human ear can discern
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
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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
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Timeline Progress: Further (Possible) Implementations 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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