1.4 KiB
There are a total of six solderjumpers on the board:
switching to the barrel jack as voltage supply
JP3 and JP4 set the source for the supply voltage. JP4 connects the voltage input to the barrel jack, JP4 connects it to the USB +5V rail.
Per Default JP4 is closed and JP3 is open, making the default way of supplying voltage the USB jack.
If the Barrel Jack should be used, then JP4 has to be opened first by cutting the trace which shorts it by default, otherwise the USB voltage will be shorted with the barrel jack, causing potential damage to the USB port. Afterwards, JP3 can be closed with a small blob of solder.
activating the equalizer
JP1 and JP2 connect the output of the Audio switching part of the Rohm chip. When left in the default setting, they will connect them to the output jack directly, bypassing the Equalisation part of the chip completely.
By selecting the other possible path, the equalisation circuit becomes usable. For this to work, JP7 and JP8 have to be closed with small solder blobs as well, since those connect the equalizers output to the output audio jack.
Assembling the rest
For assembly of the board, check the documentation folder. It contains the interactive bill of materials, which indicates what components go where.
Also take a look at the BOM for what components can be sourced where.