Drew ][ TDX comes in two versions. 1.0 was my first attempt and only had a 3.5mm jack that was on a back plate. Version 1.1 is essentially the same, but more efficient layout and full use of 2 layers on the PCB. The version 1.1 board also includes an onboard 3.5mm jack.
The ext connector from the first board can be used with this version
As you can see no onboard jack.