Re: Openeeg-list Digest, Vol 110, Issue 5

Please let me know if there are any parts I can change for newer ones with
the same pcb, I have v1.1.0 ..... ex. is the change on
http://openeeg.sourceforge.net/doc/modeeg/modeeg_design.html "A. Filter
specifications

Note: A capacitor in the filter (C7 in the schematic below) has been
changed to 1nF. That means that these specs are out of date and that some
of the numbers, and all of the graphs in the sections below are inaccurate
for ModularEEG v1.1 or later.

The change was made to remove ringing (higher-frequency oscillation) that
was observed when the amplifier was fed with the 14Hz square wave test
signal.

However, this increase in stability comes with a few drawbacks. First of
all, the filter is now less efficient at preventing aliasing. (To be
honest, it wasn't very good to begin with.) Second, the "knee" of the
frequency response is now much softer, which has an impact on signals in
the 10-40Hz range. Attenuation starts at roughly 10Hz and drops off
gradually. At 40Hz, signal strength is down 10% (1 dB).

If you want the performance shown below, you can of course use a 10nF
capacitor...

TODO: Make new graphs."


I'm going to start building soon and I want to really make something that
works, (first time building these kinds of things and I'm excited)


-Jonathan

On Thu, Aug 20, 2015 at 8:10 AM, <[email protected]
> wrote:

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>    1. Re: Newbie Questions (Richie Cyngler)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 20 Aug 2015 13:54:12 +1000
> From: Richie Cyngler <[email protected]>
> Subject: Re: [Openeeg-list] Newbie Questions
> To: "Discussion of EEG hardware, software, training protocols,  NFB
>         theory - for developers and users."
>         <[email protected]>
> Message-ID:
>         <CACi_E-R5UHqMxueZt7m7Rz8ns8maMYM46KMkHUG=
> [email protected]>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Jake,
>
> I'm also interested in an up to date and low cost EEG solution, your
> project sounds ideal. Are you documenting your progress anywhere online? Is
> there anything I can so to assist?
>
> cheers
> Richie
>
> On Wed, Aug 12, 2015 at 6:17 PM, Jake Stewart <[email protected]> wrote:
>
> > OpenBCI is a decent platform to base something on, but there are a few
> > flaws.  It's bandwidth is severely hobbled by the crap bluetooth dongle
> > they used in the design.  It also has a fair bit of useless hardware,
> like
> > the accelerometer and SD card.  The 8-bit board's Atmega processor is
> > popular but old and underpowered.  The 32-bit board uses some oddball PIC
> > processor.
> >
> > That last comment would be the problem I also see in the EEG64 project.
> > It uses an oddball 16-bit processor.  We really need to base things
> around
> > popular, market leading processors that are readily available in mass
> > quanity for cheap.
> >
> > I need a high performance system with a low per-channel cost so I?ve
> > looked at the cheapest high performance options.
> > STM32F103C8 boards are available for about $4.75 and would be, by far,
> the
> > best price/performance board readily available.  Arduino Nano USB boards
> > are only about $2.50 and are by far the most popular, but I think it
> would
> > be a mistake to base anything new around such an old 8-bit processor.
> >
> > I'm currently looking at creating an EEG board using an ESP8266 module.
> > This would be the cheapest solution of all, with a $3-4 ESP8266 module
> > handling both the SPI data and wifi connection.  It remains to be seen
> how
> > many channels the 8266 can handle while maintaining the wifi link.
> >
> > -Jake
> >
> > *Sent:* Sunday, June 28, 2015 at 2:22 AM
> > *From:* "Martin Molina" <[email protected]>
> > *To:* [email protected]
> > *Subject:* Re: [Openeeg-list] Newbie Questions
> > Looks like John Ruelas is on the ball. I would like to suggest that we
> > rally behind the www.EEG64.com project so that the open source community
> > truly has an up to date eeg platform. Once it's functionality is tested
> and
> > confirmed, then attention can turned towards the refinement of
> non-contact
> > or dry active electrodes.
> >
> > Thoughts?
> >
> > Mart?n
> >
> >
> >
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