GenL V2

GenL Version 2

The v1 boards were produced but never assembled. Version 2 sports a number of improvements, including:

TWO heater outputs and temperature sensor inputs (for heated bed + extruder)
Use of both serial interfaces on the Teensy to simultaneously program two motor controllers
Larger thermal dissipation area on PCB for motor drivers
Improved layout of power connector on driver board
Larger ground and power planes on all boards
Better labels on components and connections

Assembly Tips

Carefully inspect all solder joints before applying power! If any of them look like they may short to a neighboring trace, check with a multimeter
Use plenty of flux!
But DON'T use plenty of flux when soldering to the Teensy board near its reset button. Flux will flow up into the switch and jam it
When soldering the rows of pins to the Teensy, it is easiest to first solder the sockets onto the controller board, and use the sockets as a jig to hold all the pins in place while you solder them to the Teensy
Load a test program on the Teensy to rotate the motors at low currents. Assemble one motor stage at a time and test that it works before moving on to the next one
Add the electrolytic capacitors last as they are big and unwieldy. You will not need them to test run the board with a small, unloaded motor
When soldering the surface mount MOSFETs, first apply some flux to the board and then melt some solder onto each pad. Each pad should be a distinct bump of solder. Then, place the FET on the board and without using additional solder, apply the iron to each pin until the solder underneath melts

Recommended Assembly Order for Driver Board

Assembling parts in this order will give you ample opportunities to test the board safely before applying full power. This will minimize the chance that a flaw or error will cause permanent damage to you or the board. Most importantly, BE CAREFUL! A 12V power supply can easily light things on fire!