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Schematics for the small PCB

Portable Network Graphics (PNG) - 40.11 kB - 01/06/2021 at 15:10

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The 6 position DIP accessible from the closed lid

JPEG Image - 5.26 MB - 01/06/2021 at 14:44

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JPEG Image - 4.32 MB - 01/06/2021 at 14:44

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top view of the opened UA-25 with modification

JPEG Image - 4.72 MB - 01/06/2021 at 14:43

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top view (detail)

JPEG Image - 4.57 MB - 01/06/2021 at 14:43

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everything connected

JPEG Image - 4.11 MB - 01/06/2021 at 14:42

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AK5381 PIN 16 unsoldered from PCB and connected to wire

JPEG Image - 2.44 MB - 01/06/2021 at 14:41

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The ADC and the 3 connected wires (PIN 16, GND via and VD via)

JPEG Image - 2.52 MB - 01/06/2021 at 14:41

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To see how the ADC is connected, I first unsoldered the bypass capacitors C84 and C76. The best place to cut the PCB wires was just next to the pads. So the cuts are not really visible on the photo.

JPEG Image - 2.49 MB - 01/06/2021 at 14:38

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AK5381.pdf

The datasheet of the ADC

Adobe Portable Document Format - 104.96 kB - 01/06/2021 at 14:37

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schematics of modifications

Portable Network Graphics (PNG) - 355.35 kB - 01/06/2021 at 14:34

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