Adopt max4466 microphone amplifier + ssm2167 voice compression amplifier design, amplification adjustable. Suitable for hearing aids, conference speech, intercom calls and other occasions to use.

With voice compressor has the following advantages:
1: Compression of the dynamic range of the microphone signal can reduce the level of the peak signal, and give the low-level signal to improve the gain.
2: Reduce the bottom noise of the microphone signal, effectively improve the clarity of the output signal.