Transcription of Elect ret Microphone - TI.com
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Elect ret Microphone - TI.com
An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other important disclaimers and information. TINA-TI is a trademark of Texas Instruments WEBENCH is a registered trademark of Texas Instruments TIDU765-January 2015 Single-Supply, Electret Microphone Pre-Amplifier Reference Design 1 Copyright 2015, Texas Instruments Incorporated John Caldwell TI Designs Precision: Verified Design Single-Supply, Electret Microphone Pre-Amplifier Reference Design TI Designs Precision Circuit DescriptionTI Designs Precision are analog solutions created by TI s analog experts. Verified Designs offer the theory, component selection, simulation, complete PCB schematic & layout, bill of materials, and measured performance of useful circuits.
This topology was selected for a few reasons. First, it allows for single-supply operation to be easily accommodated by biasing the non-inverting input of the op amp to the mid-supply point. Second, the gain of the pre-amp is determined by R2 but the noise gain of the op amp is determined by the ratio of R2 to R1.
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