Re: DRL problem

Wait. I know that. I am only using one channel, I do not have another
floating. In my circuit there is one channel only not two. I wanted to do
measurements of relaxation and meditation on frontal region therefore I
need only one channel.
There is no floating channels.

Regards
Andre

On Thu, Mar 7, 2013 at 11:31 AM, [email protected] <
[email protected]> wrote:

>  it is especially a problem IF you only use one channel. you have to
>  ground unused channels or the dlr circuit wont work!
>  the dlr circuit is an output channel, floating eeg inputs cause the dlr
>  signal to take false values.
>
>  regards,
>  jan
>
>  Am Donnerstag, den 07.03.2013, 12:25 +0100 schrieb André Ribeiro
>  <[email protected]>:
> > Hi,
> >
> > I am using only one channel. So that should not be the problem. I am
> > also not using shielded electrodes. I have the cables twisted to
> > reduce RF.
> >
> > Regards,
> >
> > Andre
> >
> > On Thu, Mar 7, 2013 at 9:56 AM, Mike  wrote:
> >  Hi Andre,
> >
> >  Have you ensured that unused EEG inputs are connected to ground
> > (0V)? The DRL won't work with inputs left floating (unconnected).
> > This
> > is stated in the amplifier schematic
> > http://openeeg.sourceforge.net/doc/modeeg/modEEGamp-v1.0.png
> > [2] bottom left.
> >
> >  Regards,
> >
> >  Mike
> >
> >  ----- Original Message -----
> >  Date: Wed, 6 Mar 2013 12:26:23 +0000
> >  From: Andr? Ribeiro
> >  Subject: [Openeeg-list] DRL problem
> >  To: [email protected] [4]
> >  Message-ID:
> >
> >  Content-Type: text/plain; charset="iso-8859-1"
> >
> >  Hello,
> >
> >  I am a Biomedical student from Portugal and I was developing a eeg
> > board
> >  (only the analog part) based on the schematics of the Modular EEG. I
> > have
> >  however one problem with the DRL, as I can't make it to work
> > properly.
> >  Indeed I have better results if I connect directly the 3rd electrode
> > to the
> >  GND.
> >  Before someone asks I did however some modifications and I would
> > want
> > to
> >  know if this could be the problem for the DRL or not.
> >  Ok so from the INA114 I use a buffer just like Modular EEG, however
> > I
> > am
> >  using the LF412 then on the inverting amplifier I also connected a
> > 10M
> >  resistor parallel to c216 (1nF) for stability (I think) and again
> > used a
> >  LF412.
> >
> >  I would appreciate any input.
> >
> >  Thanks,
> >  -------------- next part --------------
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> >
> >
> >
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> Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the
> endpoint security space. For insight on selecting the right partner to
> tackle endpoint security challenges, access the full report.
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------------------------------------------------------------------------------
Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester  
Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the  
endpoint security space. For insight on selecting the right partner to 
tackle endpoint security challenges, access the full report. 
http://p.sf.net/sfu/symantec-dev2dev