USB hub with Audio DAC
This is a simple USB hub which has USB C inputs along with a headphone out
Created by
Anshuman Tripathy
Tier 4
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cubit010
requested changes for USB hub with Audio DAC ago
user request
Anshuman Tripathy
submitted USB hub with Audio DAC for ship review ago
Anshuman Tripathy
added to the journal ago
Completed CAD
- i have completed the cad for the PCB
- added a 1mm depth near the USB and Audio ports for better spacing and aesthetics
- I have also added chamfer at the bottom to screw m2.5mm screws so that it fits flush in
- the design is such that the top past will hold on the pcb like a clamp
Anshuman Tripathy
added to the journal ago
Started out with the CAD
started out withe cad it will be a two part design which when connected will hold the pcb too.
also made the cut out for the type C connector this took some time to perfect eh dimensions.
Anshuman Tripathy
added to the journal ago
did a few changes
refined the copper pour
changed the switch to a latchable one,
removed the copper pour under the crystal to avoid parasitic capacitance to avoid noise
did ground stitching
assigned the 3d model of all the components
Anshuman Tripathy
added to the journal ago
Routed the PCB
completed routing the PCB and kept the AGND and PGND separate and connected the with a 0 ohm resistor at a single point to avoid unnecessary noise in headphone also, i removed the dual usb system since i didnt like it much along with the dual headphone input thing.
Anshuman Tripathy
added to the journal ago
Completed Schematic
Completed routing the USB in and USB out
i have added usb C as input and there will be dual option for extension either via USB C or USB A and at the input i will use USB C
for the audio out also there will he 2 options
single port for AUIDO+ MIC
DUAL port for AUIDO and MIC separately
Anshuman Tripathy
added to the journal ago
Completed the Audio Part
Completed making the audio portion of the hub taking reference from the datasheet for PCM2912A
there will be 2 led indicator to indicate the functioning of the PLAY and REC option also there will be a mute switch
Anshuman Tripathy
added to the journal ago
Researched for the parts
For the USB hub i will be using the SL2.1A USB hub ic.
And for the USB DAC it was my first time working with it so i was confused as to which IC would be good to use and had to do quite a but if research before i found kind a the perfect one.
the ones i stumbled across were CM108B, PCM2704 and PCM2912A
finally i went with PCM2912a since it was both cheap as well had the option for MIC IN
so i will be making the hub based on these.
Anshuman Tripathy
started USB hub with Audio DAC ago
2/18/2026 - Researched for the parts
For the USB hub i will be using the SL2.1A USB hub ic.
And for the USB DAC it was my first time working with it so i was confused as to which IC would be good to use and had to do quite a but if research before i found kind a the perfect one.
the ones i stumbled across were CM108B, PCM2704 and PCM2912A
finally i went with PCM2912a since it was both cheap as well had the option for MIC IN
so i will be making the hub based on these.
2/21/2026 - Completed the Audio Part
Completed making the audio portion of the hub taking reference from the datasheet for PCM2912A
there will be 2 led indicator to indicate the functioning of the PLAY and REC option also there will be a mute switch
2/22/2026 - Completed Schematic
Completed routing the USB in and USB out
i have added usb C as input and there will be dual option for extension either via USB C or USB A and at the input i will use USB C
for the audio out also there will he 2 options
single port for AUIDO+ MIC
DUAL port for AUIDO and MIC separately
3/6/2026 3 PM - Routed the PCB
completed routing the PCB and kept the AGND and PGND separate and connected the with a 0 ohm resistor at a single point to avoid unnecessary noise in headphone also, i removed the dual usb system since i didnt like it much along with the dual headphone input thing.
3/6/2026 8 PM - did a few changes
refined the copper pour
changed the switch to a latchable one,
removed the copper pour under the crystal to avoid parasitic capacitance to avoid noise
did ground stitching
assigned the 3d model of all the components
3/7/2026 - Started out with the CAD
started out withe cad it will be a two part design which when connected will hold the pcb too.
also made the cut out for the type C connector this took some time to perfect eh dimensions.
3/9/2026 - Completed CAD
- i have completed the cad for the PCB
- added a 1mm depth near the USB and Audio ports for better spacing and aesthetics
- I have also added chamfer at the bottom to screw m2.5mm screws so that it fits flush in
- the design is such that the top past will hold on the pcb like a clamp