The MAX9814 Microphone AGC Amplifier Module amplifies audio from an onboard electret condenser microphone and adjusts gain automatically using the MAX9814 IC’s built-in AGC circuit. Loud sounds get attenuated and quiet sounds get boosted, so your ADC sees a consistent 2Vpp signal on a 1.25V DC bias across the full frequency range of 20Hz to 20kHz. The max9814 microphone runs on 2.7V to 5V DC at just 3mA typical current.
The max9814 microphone amplifier module offers three fixed gain settings selected by the GAIN pin. Connect GAIN to VDD for 40dB, GND for 50dB, and leave it floating for 60dB. A non-obvious detail is that the AGC attack and release times are fixed inside the MAX9814 IC and cannot be adjusted externally. In environments with rapid sound level changes, the AGC may not respond fast enough, causing brief clipping or under-amplification during sudden transitions. Total harmonic distortion is only 0.04% at typical settings, giving very clean audio output.
Voice recognition developers and IoT audio engineers use the MAX9814 microphone module with microcontrollers like Arduino to capture and amplify audio signals, which can be read through an ADC pin for sound detection, recording, or preprocessing.StemVolt provide module with the microphone capsule and all passive components pre-soldered.
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Features:
- AGC circuit inside MAX9814 IC adjusts gain automatically without any external control
- Frequency response of 20Hz to 20kHz covers the full human audible range accurately
- Total harmonic distortion of 0.04% typical keeps audio output clean at all gains
- Output of 2Vpp on 1.25V DC bias connects directly to 3.3V or 5V ADC inputs
Technical specifications:
| Specification | Details |
|---|---|
| Supply Voltage | 2.7V to 5V DC |
| Amplifier IC | MAX9814 with AGC |
| Microphone Type | Electret condenser microphone |
| Gain Control/Settings | 40dB (GAIN to VDD), 50dB (GAIN to GND), 60dB (GAIN floating) |
| Current Consumption | 3mA (typical) |
| Output | 2Vpp (Peak-to-Peak) on 1.25V DC Bias. |
| Frequency Response | 20Hz to 20kHz |
| THD (Total Harmonic Distortion) | 0.04% (Typ) |
Applications:
- Monitor circuit uses max9814 agc microphone module to detect crying and trigger alert over WiFi
- Audio recording logger uses ADC samples from the module to store voice memos on an SD card
- Voice command module uses MAX9814 Microphone AGC Amplifier Module to capture speech before sending to a speech recognition API
Package includes:
- 1 x MAX9814 Microphone AGC Amplifier Module
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