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Single-Supply, Electret Microphone Preamplifier Reference Design
TIPD181
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Key Document

Description

This TI Precision design details the design process for a preamplifier to be used with electret microphone capsules. It explains the basic construction and operation of an electret microphone and uses an OPA172 to amplify the output of the microphone to common analog line level voltages.

Features
  • TI Precision Designs: Verified Design
  • Designed for a single 9V battery power supply
  • ~2mA supply current
  • 68dB SNR with Microphone
  • This design is tested and includes theory, component selection, TINA-TI simulation, PCB schematic & layout, bill of materials, and measured results.

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Schematic/Block Diagram

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Test Data

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA172  1-Channel, 10-MHz, 36V, high slew-rate, low-noise, RRO, op amp  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA172 Download
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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 960 02 Feb 2015
Design files (3)
Title Type Size (KB) Date
PDF 94 18 Feb 2015
PDF 104 18 Feb 2015
ZIP 488 18 Feb 2015

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