Fwd: Most Updated Design

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So I looked at what you are proposing and it won't work. Firstly the signal
will be still too small to capture it properly, note that you are receiving
hundreds of micro volts. This sole operational amplifier is not set to
amplify the signal into volt level. The ATmega ADC definition is 10b (1024
values) across 0-4V that means one step will be 3,90625 milivolt
(0,00390625V). The signal will be still too weak. The active electrodes are
only for aqusition of the signal. The signal is sent to the analog/digital
PCB board for a reason... Your way you wouldn't have it accurate at all, of
course the amplivier can do thousandfold amplification, but you won't avoid
artifacts and noise... Of course it is possible to make complete EEG
aparatus on head (view OpenBCI http://openbci.com/ ) But with OpenEEG it is
not viable.
As for the shielding on the electrodes, don't sweat it, I don't have
shielding and it works, but I've got high DC noice as I've probably used
not so appropriate contact material (silvered brass pins) and I'm not using
contact gel. But when measuring alpha waves while sitting still, I can get
very good results. You can view my measurement in the documentation on page
36.
If you still don't get the idea on how to get it working, just go through
the schematics and study some theory of what the used parts represent and
what are they doing to the signal.

I'm not sure if I answered your question completly, if so don't hesitate to
ask further.

2018-03-25 23:40 GMT+02:00 Houssam Eddine <[email protected]>:

> Hello Tyler and Damian,
>
> I want to ask you Damian if you don't mind about this old design:
> http://uazu.net/eeg/ae.html
> I build 80% of the electrode, now Im so confused about the material of th=
e
> guarding box, and if I can use a normal battery (5v) for the amplifier.
> I want to use the analog signal (output of the TLC272) directly in an
> Analog to Degital converter.
>
> Please tell me if you have any suggestion, idea or orientation.
>
> Bests.
> ------------------------------
> *From:* Dami=C3=A1n Filo <[email protected]>
> *Sent:* Sunday, March 25, 2018 22:45
> *To:* Discussion of EEG hardware, software, training protocols, NFB
> theory - for developers and users.
> *Subject:* Re: [Openeeg-list] Most Updated Design
>
> Hello Tyler.
> As you might have noticed in recent discussions here in openeeg mailing
> list I've been designing updated version of EEG-SMT made by Olimex LTD..
> And I promised sharing it with anybody who would be interested in it. If
> you are electronic enthusiast or tinkerer, my version is what you've been
> looking for. I've taken EEG-SMT and made it modular again. Just take a lo=
ok
> at my design, which can be found here:
>
> https://mega.nz/#!JYQmgBZL!6P4nx13fcZs2gp65YZh18EGrOVqUzArJv753gL5m9bw
>
> And if you've got any other questions, just ask.
>
> Best regards,
> Dami=C3=A1n Filo.
>
> 2018-03-25 0:40 GMT+01:00 Tyler Foland <[email protected]>:
>
> Hi,
>
> I hope you are well. I am interested in building an EEG and am wondering
> what the most up-to-date design is currently. I would really appreciate a=
ny
> information you can provide!
>
> Best,
> Tyler Foland
>
> ------------------------------------------------------------
> ------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Openeeg-list mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/openeeg-list
> Go to the above address to change your
> subscription options, e.g unsubscribe.
>
>
>
>
> --
> Dami=C3=A1n Filo
>



--=20
Dami=C3=A1n Filo



--=20
Dami=C3=A1n Filo

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<div dir=3D"ltr">So I looked at what you are proposing and it won&#39;t wor=
k. Firstly the signal will be still too small to capture it properly, note =
that you are receiving hundreds of micro volts. This sole operational ampli=
fier is not set to amplify the signal into volt level. The ATmega ADC defin=
ition is 10b (1024 values) across 0-4V that means one step will be 3,90625 =
milivolt (0,00390625V). The signal will be still too weak. The active elect=
rodes are only for aqusition of the signal. The signal is sent to the analo=
g/digital PCB board for a reason... Your way you wouldn&#39;t have it accur=
ate at all, of course the amplivier can do thousandfold amplification, but =
you won&#39;t avoid artifacts and noise... Of course it is possible to make=
 complete EEG aparatus on head (view OpenBCI <a href=3D"http://openbci.com/=
" target=3D"_blank">http://openbci.com/</a> ) But with OpenEEG it is not vi=
able.<br><div class=3D"gmail_quote"><div dir=3D"ltr"><div>As for the shield=
ing on the electrodes, don&#39;t sweat it, I don&#39;t have shielding and i=
t works, but I&#39;ve got high DC noice as I&#39;ve probably used not so ap=
propriate contact material (silvered brass pins) and I&#39;m not using cont=
act gel. But when measuring alpha waves while sitting still, I can get very=
 good results. You can view my measurement in the documentation on page 36.=
<br></div>If you still don&#39;t get the idea on how to get it working, jus=
t go through the schematics and study some theory of what the used parts re=
present and what are they doing to the signal.<br><div><div><div><br>I&#39;=
m not sure if I answered your question completly, if so don&#39;t hesitate =
to ask further.<br></div></div></div></div><div class=3D"gmail_extra"><div>=
<div class=3D"h5"><br><div class=3D"gmail_quote">2018-03-25 23:40 GMT+02:00=
 Houssam Eddine <span dir=3D"ltr">&lt;<a href=3D"mailto:houssem.boukhemis@h=
otmail.com" target=3D"_blank">[email protected]</a><wbr>&gt;</s=
pan>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;borde=
r-left:1px #ccc solid;padding-left:1ex">




<div dir=3D"ltr">
<div style=3D"font-family:Calibri,Helvetica,sans-serif;font-size:12pt;color=
:rgb(0,0,0);background-color:rgb(255,255,255)">
Hello Tyler and Damian,<br>
<br>
I want to ask you Damian if you don&#39;t mind about this old design:<br>
<a href=3D"http://uazu.net/eeg/ae.html" id=3D"m_4666751890200981521m_-48118=
07007422236789LPNoLP795161" target=3D"_blank">http://uazu.net/eeg/ae.html</=
a><br>
I build 80% of the electrode, now Im so confused about the material of the =
guarding box, and if I can use a normal battery (5v) for the amplifier.<br>
I want to use the analog signal (output of the TLC272) directly in an Analo=
g to Degital converter.<br>
<br>
Please tell me if you have any suggestion, idea or orientation.<br>
<br>
Bests.<br>
</div>
<hr style=3D"display:inline-block;width:98%">
<div id=3D"m_4666751890200981521m_-4811807007422236789divRplyFwdMsg" dir=3D=
"ltr"><font style=3D"font-size:11pt" face=3D"Calibri, sans-serif" color=3D"=
#000000"><b>From:</b> Dami=C3=A1n Filo &lt;<a href=3D"mailto:nogaii34@gmail=
.com" target=3D"_blank">[email protected]</a>&gt;<br>
<b>Sent:</b> Sunday, March 25, 2018 22:45<span><br>
<b>To:</b> Discussion of EEG hardware, software, training protocols, NFB th=
eory - for developers and users.<br>
</span><b>Subject:</b> Re: [Openeeg-list] Most Updated Design</font>
<div>=C2=A0</div>
</div><div><div class=3D"m_4666751890200981521h5">
<div>
<div dir=3D"ltr">
<div>Hello Tyler. <br>
</div>
<div>As you might have noticed in recent discussions here in openeeg mailin=
g list I&#39;ve been designing updated version of EEG-SMT made by Olimex LT=
D.. And I promised sharing it with anybody who would be interested in it. I=
f you are electronic enthusiast or tinkerer,
 my version is what you&#39;ve been looking for. I&#39;ve taken EEG-SMT and=
 made it modular again. Just take a look at my design, which can be found h=
ere:<br>
<br>
<a href=3D"https://mega.nz/#!JYQmgBZL!6P4nx13fcZs2gp65YZh18EGrOVqUzArJv753g=
L5m9bw" target=3D"_blank">https://mega.nz/#!JYQmgBZL!6P4<wbr>nx13fcZs2gp65Y=
Zh18EGrOVqUzArJv<wbr>753gL5m9bw</a><br>
<br>
</div>
<div>And if you&#39;ve got any other questions, just ask.<br>
<br>
</div>
<div>Best regards,<br>
</div>
<div>Dami=C3=A1n Filo.<br>
</div>
</div>
<div class=3D"m_4666751890200981521m_-4811807007422236789x_gmail_extra"><br=
>
<div class=3D"m_4666751890200981521m_-4811807007422236789x_gmail_quote">201=
8-03-25 0:40 GMT+01:00 Tyler Foland <span dir=3D"ltr">
&lt;<a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]=
u</a>&gt;</span>:<br>
<blockquote class=3D"m_4666751890200981521m_-4811807007422236789x_gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>
<div dir=3D"ltr">Hi,
<div><br>
</div>
<div>I hope you are well. I am interested in building an EEG and am wonderi=
ng what the most up-to-date design is currently. I would really appreciate =
any information you can provide!</div>
<div><br>
</div>
<div>Best,</div>
<div>Tyler Foland=C2=A0</div>
</div>
<br>
------------------------------<wbr>------------------------------<wbr>-----=
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Check out the vibrant tech community on one of the world&#39;s most<br>
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=3D"noreferrer" target=3D"_blank">
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Go to the above address to change your<br>
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<br>
<br clear=3D"all">
<br>
-- <br>
<div class=3D"m_4666751890200981521m_-4811807007422236789x_gmail_signature"=
>Dami=C3=A1n Filo</div>
</div>
</div>
</div></div></div>

</blockquote></div><br><br clear=3D"all"><br></div></div><span class=3D"HOE=
nZb"><font color=3D"#888888">-- <br><div class=3D"m_4666751890200981521gmai=
l_signature" data-smartmail=3D"gmail_signature">Dami=C3=A1n Filo</div>
</font></span></div>
</div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail_signature" data-=
smartmail=3D"gmail_signature">Dami=C3=A1n Filo</div>
</div>

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