Re: 2-channel EEG and schemas files

Hi Paul

It doesn't really make sense to have your own blank PCBs made when you can
order them from Olimex.  For the simple reason that a PCB manufacturer
needs to tool up for a PCB, meaning they will need to develop all sorts of
masks etc. and for that you need to pay the so called tooling costs, also
refered to as the origination costs.  These are once-off and are the reason
that if you order many PCBs, or you re-order PCBs, the costs plummet.

If you only want a 2-channel (and don't plan to upgrade to more channels at
a later stage) I would suggest you rather go for the SMT-EEG.  But I am not
sure if Olimex sells the unpopulated PCBs only.  From a cost point of view,
I don't think you can build the SMT-EEG or the 2-channel modEEG cheaper
than what the build and tested SMT unit from Olimex cost.

Also remember the following points:

1. Many DIY projects fail because the builder does not follow through and
builds his project into a decent enclosure.  Many a HiFi amp was scrapped
because it ended up in a cardboard shoebox.  I don't like the fact that the
SMT-EEG has it's input sockets distributed around the circumference of the
box, but at least it is a complete, plug-and-play device.

2. If you are inexperienced, you could make some crucial mistakes when
mounting the modEEG boards into a box.  I am referring to isolation
distances between PCBs and distances between PCBs and the use of any metal
enclosures and/or screening.  To be on the save side, it's best to only use
plastic boxes.  A mistake here will still have your EEG amp working, but it
is potentially unsave to use, due to possible compromised/degraded
electrical isolation.

I can't comment on version numbers etc. I haven't looked at the available
files and supporting documentation for years.

Regards
Stefan

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