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Light Sensitive Audio Gain Circuit

IP.com Disclosure Number: IPCOM000012064D
Original Publication Date: 2003-Apr-04
Included in the Prior Art Database: 2003-Apr-04

Publishing Venue

Motorola

Related People

Authors:
Michael Calendine Paul Faerber Ryan Rye

Abstract

Our design includes a photocell, or light-sensitive resistor, whose resistance varies directly with the amount of light incident on the cell. By incorporating this photocell resistor into the audio gain circuit, the volume of the speakerphone can be directly proportional to the amount of light surrounding the cell phone.