Non-inverting microphone pre-amplifier circuit



This circuit uses a non–inverting amplifier circuit configuration to amplify the microphone output signal. This circuit has very good magnitude flatness and exhibits minor frequency response deviations over the audio frequency range. The circuit is designed to be operated from a single 5-V supply.
  • Single 5-V supply
  • Input pressure: 100 dB SPL (2 Pa)
  • Max output: 1.228 Vrms
  • Frequency range: 20 Hz to 20 kHz
General-purpose op amps
TLV6741 Single, 5.5-V, 10-MHz, low noise (4.6-nV/√Hz) operational amplifier
Precision op amps (Vos<1mV)
OPA320 Precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier
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Type Title Date
* Circuit design Non-inverting microphone pre-amplifier circuit 30 Dec 2018
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. C) 18 Dec 2023
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. B) 05 Oct 2022
User guide Single-Supply Electret Microphone Preamplifier Reference Design 02 Feb 2015

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Reference designs

TIPD181 Single-Supply, Electret Microphone Preamplifier Reference Design

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