Stereo audio in with variable gain and offset

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development module
adc-t.jpg
adc-b.jpg
Description

Simple analog interface for stereo audio in. To interface the audio signal to the microcontroller's ADC a low noise, single supply, rail to rail, dual operational amplifier is on board.

Motherboard Interface:
2 pins on the module connector side, to be connected onto the ADC pin of the microcontroller.

External Interface:
RCA connectors on the input side.

Features:

  • adjustable offset
  • adjustable amplification
  • single supply, no additional power is needed
  • low noise op-amp

PCB rev
v1.0
version of PCB