Dev branches merged into master branch. Optimizing...
by Nader Nikbakht 7 years 3 months
Dev branches merged into master branch. Optimizing the board routing and
incorporating GFL comments:
===========================
1- top right of AD8224 (pins 12 and 13): don't run a trace under the corner of the chip, as per the data sheet.
2- power bypassing: capacitor placement does not agree with datasheet recommendation (pg 23 § "Power supplies" ¶ 3 sentence 2)
3- via placement for bypass capacitors should be as close as possible to the 0.1uF caps
4- power planes: you could easily use copper pours instead of traces for the copper planes here, I think you could move the few traces on the internal layers around a pour.
5- gain resistor should be as close to pin 2 and 3 as possible, with equal capacitances. I think they could stand to be closer. Maybe rotating the AD8224 90 degrees clockwise would allow for tighter routing of high-impendace low voltage signals, minimizing the chance of noise sources coupling into the system. Be wary during construction of the +-15V hoving right over the elctrode traces. As the wires move w.r.t. the high impedance traces, the capacitance will vary with the motion inducing current flow (and therefore voltage).
6- C6 may block the connector. I would see how much clearance you have and if the bend angle you're hoping for is achievable. (you can look at my boards as an example of what bend angle is possible)
============================
6f899b97
Remove screenshots from repo
by Galen Lynch 7 years 3 months
Remove screenshots from repo

These screen shots are 'derived' from the design files and should not be in the
repository itself. For example, are they currently up to date, or do they
reflect the design as it was a few commits ago? It's hard to tell, and therefore
I think these sorts of files do more harm than good.
cfe3bc92
Move layouyt files to their own directory
by Galen Lynch 7 years 3 months
7f2164d2
Add gerbers dir to project, which should be empty
by Galen Lynch 7 years 3 months
407a5cfb
Move eagle design files into separate directory
by Galen Lynch 7 years 3 months
3c39ed33
Improve .gitignore to prevent inclusion of autorou...
by Galen Lynch 7 years 3 months
Improve .gitignore to prevent inclusion of autorouter files
2b6201e3
Remove temporary and useless files
by Galen Lynch 7 years 3 months
89f4bd95
minor routing and dimension and docu layer changes...
by Nader Nikbakht 7 years 3 months
minor routing and dimension and docu layer changes.
eff849cc
solved the order of CAPCOM and Bridge balance nets...
by Nader Nikbakht 7 years 3 months
solved the order of CAPCOM and Bridge balance nets and routing as per
GFL suggestions.
4cd082e9
extended drive length to give more space at the bo...
by Nader Nikbakht 7 years 3 months
extended drive length to give more space at the bottom for dental cement
anchoring. PCB = 9.26mm X 19.91 mm
092ab9b8
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