Simple analog interface for stereo audio line in and line out. To interface the audio signal to the microcontroller's ADC in and PWM out pin, 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.
2 pins to the microcontroller's PWM output pin (or any IO pin for software PWM)

External Interface:
2x 3,5 mm jack as audio in and out.

Voltage:

• 3,3V
• 5V

Features:

• fixed offset
• fixed amplification (adjustable by replacing 2 SMD resistors)
• band pass filter for audio in or out on board
• single supply, no additional power is needed
• low noise op-amp
• max 0.4W @ 5V