Motherboard Audio

Finally, some motherboards provide a pin header that allows connection to a front-mounted audio connector, designed to support stereo audio output (headphone or amplified speakers) and a monochrome microphone input.

The Intel Front Panel Connectivity Guide recommends the following design for front-mounted audio connectors. If your motherboard is a recent design, it’s likely it will be identical, or at least similar.

Pin	Signal name	Description
1	AUD_MIC	Front Panel Microphone input signal
2	AUD_GND	Ground used by Analogue Audio Circuits
3	AUD_MIC_BIAS	Microphone Power
4	AUD_VCC	Filtered +5 V used by Analogue Audio Circuits
5	AUD_FPOUT_R	Right Channel Audio signal to Front Panel
6	AUD_RET_R	Right Channel Audio signal Return from Front Panel
7	HP_ON	Reserved for future use to control Headphone Amplifier
8	KEY	No Pin
9	AUD_FPOUT_L	Left Channel Audio signal to Front Panel
10	AUD_RET_L	Left Channel Audio signal Return from Front Panel

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