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Figure 4.
Intel® HD Audio - Analog Front Panel Header
Manufacturer's Part Number: Wieson* Electronic 2100C888-042 (or equivalent)

2.3.5.1 Intel® HD Audio CODEC Connections
In general, the CODEC ports selected for front panel use are connected to the Intel® HD Audio
header via series coupling capacitors C1 through C4. The resistors labeled Rbias are required if the
front panel jacks are required to support microphone functionality. Note that Figure 5 shows two
Vref output per CODEC port. The number of VREF outputs per PORT is a CODEC product
specific. Designers should consult their CODEC vendor’s datasheet for detailed information VREF
implementation, the details of the jack detection network, and selection of coupling capacitors.

Front Panel I/O Connectivity Design Guide