On this page you will find pictures of the assembled PCB plus important positioning and other information.
Please read the whole page before attempting assembly. Keep scrolling down until there’s no more page.
“Top” of the board means where the C50 connector is. You can tell you’re looking at the top because the “USB” marker for the green dev module is on this side.
“Bottom” of the board means the same side as where the microSD slot goes.
Things which are installed into the bottom side of the PCB:
* Voltage Regulator (three pin device that has a big metal tab with a hole in it)
* R1, and R2. These resistors set the voltage which the regulator outputs. They are different sizes to make identification easier. R2 smaller, R1 larger.
Things which are installed into the top side of the PCB:
* C50 connector
* Diode
* Fuse
* Termination Resistor Networks (important note on these later in instructions)
* Green dev module / microcontroller module
Here are pictures of the top and bottom with all parts assembled. Note that your kit *does not come with* sockets for the resistor packs, and also does not include a jumper for the Use_Tpwr jumper (it’s hard-soldered). Termination for these is always enabled, and cannot be disabled.
In these pictures, you will notice that the PCB is labeled with a hardware license and says not for commercial sale. This is because I intend to release the PCB design later on, and it will be a non-commercial license. As the creator of these designs, I am naturally allowed to sell them.
Case assembly has an important note
After placing the PCB into the bottom of the case, unscrew the connector shell’s phillips-head fasteners just a little. Then put the top of the case on. Hold the top half together tightly and screw the phillips-head fasteners back in. The printed case has holes which interface with those screws for extra strength.
PCB Assembly Notes
The most critical part of the bottom of the PCB is to align the hole in the voltage regulator with the hole in the PCB. A mounting post extends through here to press the metal tab against the exposed metal on the PCB to assist in cooling the voltage regulator.
The most critical part of the top of the PCB is to align the resistor networks (yellow things with 10 legs) properly. One faces the C50 connector and the other faces opposite. See the assembled PCB pictures to be sure of the orientation before soldering them in place.
Note that the leads from the voltage regulator and resistors must be cut short so that the microcontroller module does not touch them. A later revision might move these parts somewhere else – this is a pretty crowded board.
Pictures of assembled PCB
