Blueson A1 Backpack - BEC Interface for Receivers

The Blueson A1 is a powerful yet affordable 4in1 ESC but like all other 4in1 ESCs it comes with one drawback - wiring. When you are wiring a combat robot instead of using a flight controller, there's no easy interface for the standard 8-pin connector found on many of these ESCs. Well, at least not until now!

Introducing the Blueson A1 Backpack PCB. There are a few versions:
1. V0.3 BETA - linear regulator with a 36V max input, but will overheat at above 6S voltage.
2. V0.9 and later: 60V max, with a switching regulator easily able to handle 8S or above voltages. Tested for 40 minutes at 60V without issue!


This backpack PCB handles several important functions. 

1. Provides a breakout of the 8-pin to helpful labeled pads
2. Has an onboard power LED and voltage regulator to convert battery voltage to 5V for a standard RC receiver
3. Has a 6 pad breakout of the ground, 5V and motor signals to a secondary PCB
4. The secondary PCB has a set of 12 holes perfectly aligned for an ER4 (or R84) receiver to slot and solder in place, allowing for a compact right-angle sandwich board construction
5. Matching 20x20mm M3 mounting holes allow for the whole board to act as a 'backpack' when combined with a Blueson A1 ESC and a suitable 3D printed spacer (not included). 

CAD Models are available here. 

eCAD view: top and bottom

Full schematic (beta):