Fasizi 2pcs MAX9814 Electret MIC Microphone Amplifier Module Auto Gain Control for Arduino

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  • The MAX9814 is a high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias.
  • The low-noise preamplifier has a fixed 12dB gain, while the VGA gain automatically adjusts from 20dB to 0dB, depending on the output voltage and the AGC threshold.
  • A trilevel digital input programs the output amplifier gain. An external resistive divider controls the AGC threshold and a single capacitor programs the attack release times.
  • A trilevel digital input programs the ratio of attack-to-release time. The hold time of the AGC is fixed at 30ms. The low-noise microphone-bias-voltage generator can bias most electret microphones.

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