Oversky MUL-A PDB fix

BEWARE! execute at own RISK, this is a DIY project, no warranty. :)

Oversky does not give any maximum power or amperage rating for PDB (power distribution board) that is shipped with the MUL-A flight controller. Oversky mentions that this board is not compatible with motors lager then 2203. But that doesn't tell anything about the maximum power or current. E.g: a 1806 motor on 4 cell with 4 inch props can draw more current then a 2203 motor on 2 cell with 6 inch prop.

Some problems on the PDB that limit the current.
- the power supply connector. It's even smaller than a XT30 connector. so less than 30 AMPS.
- the solder pads for the motors. These are also very small. I guess less than 8 AMPS per motor.

What I noticed is that one side of the board is almost completely coverd in coperfilm connected to the + on the power connector. The other side of board is also coverd in coperfilm and connected to the - on the power connector.

So step one is to change the power connector. Remove it and solder a XT60 connector or simular to the board.
Step 2 is to enlarge the surface area of the motor solder pads. On one side of the board remove the paint for the + pads. On the other side of the board remove the paint for the - pads.
(see pictures below)
This way you can double the surface area wich increases the save amount of current that can flow trough.

I'm not givving any max current rating for these modification. I'm not an engineer and this all DIY at your own risk. No warranty! Currently I'm using this PDB with these modifications in combination with 4 x 1806 motors on 3 cell, drawing 12 amps (per motor) at max load. (= total 48A)