For a while I've been running on a high-voltage brushless servo which can't be supplied with power by the EiBotBoard directly because:

1. It only outputs 5V and the brushless servo really wants 7V+
2. It can only safely output perhaps 200mA at 5V and the brushless servo can easily take 2000mA which would probably make the EiBotBoard very unhappy

As a result I made a terrible power supply board from perfboard and a cheap DC-DC converter but I wasn't happy to share it because it's easy to get things wrong and this might break expensive things

Now instead of my perfboard abomination I've had a PCB made which has the circuitry included so all that's needed is to solder on some power sockets, a DC-DC converter board and some pin headers for the servo signal in and out connections

Example parts are linked below - these aren't recommended, they're just links to show roughly what you need:

• Power sockets like the ones in the BOM
• DCDC converter like these (£6.49 at time of writing; pack of 5, you only need one)
• Pin headers like these (£5.69 at time of writing, pack of loads, you need only a couple)

The power sockets are the same ones as I've seen on some Arduino boards - if you have any broken ones you might be able to harvest your parts by desoldering some

You'll need a 5.5x2.5mm barrel jack to input power (for my board this is 12V) and a male-male connector cable to transfer power to the EiBotBoard (I made one using these)

My plotter design with more details on construction is here