It should be set to 1.6mm, using the FR4 TG135 (default) core, and
JLC04161H-7628 stackup from JLCPCB.
Outer copper weight should be 1oz and inner copper weight
0.5oz (not the 2oz and 1oz which the design centered around
earlier). This allows a maximum 2A current draw from
each output channel.
If possible, order the stencil as well
Use DHL or FedEx shipping, the Global standard direct line is cheap
but takes upwards of 2 weeks for shipping alone.
Rough total, including stencil, board, shipping, and tariffs should
be ~$50-70.
Mechanical Notes
Dimensions are 100mm*100mm, with 3mm fillet on corners.
The two bottom PTHs are 4.25mm away from the bottom and side edges,
and the top PTHs are 25mm away from the top.
WAGO Connectors are spaced 3.371mm from each other and are spaced
evenly about the center of the board, 2.68mm away from the top
edge.
When on, 12V is supplied to the LEFT side of the WAGO connector when
facing it. 12V at the port above the small silkscreen arrow.
Relays are Panasonic SPST-NO relays with no internal flyback diode.
Coil voltage and current consumption is 12V 30mA, so 360mW per
relay.
High current output passes through solder bridges, 1mm traces (1oz
outer copper, 2.4A current capacity), relays (5A), and WAGO 2601
connector. The weak link is the solder bridge which can handle 2A per
channel.
The input power screw terminal is capable of 15A continuous. High
current pins have either 1mm traces to/from or 2 spokes of 0.5mm thermal
relief.
Assembly Notes
There are two CAN connectors, but only one has to be soldered
(either the screw terminal, or the 3 pin DTF).
The radial capacitors are electrolytic and thus must be
installed with the correct polarity.
The columns of solder bridges (shown below) correspond to the 8
relays and outputs. If, for a given output channel (column of SBs), the
top two are bridged via a thick dollop of solder, the on-state
of the relay will present 12V at one end of the connector and ground at
the other. On the other hand, if only the
bottom SB is bridged with solder, the on-state of the relay will
simply connect the 2 terminals of the WAGO connector internally. This is
handy if you want to drive something with a separate power source, or
with a different voltage.
