Re: DRL problem

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 <[email protected]> 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 bottom left.
>
> Regards,
>
> Mike
>
> ----- Original Message -----
> Date: Wed, 6 Mar 2013 12:26:23 +0000
> From: Andr? Ribeiro <[email protected]>
> Subject: [Openeeg-list] DRL problem
> To: [email protected]
> Message-ID:
>     <CALUfTPz+VV648rTXWy30eR1WPJUeFOgPyJf_nzC6RCHnxr7bww@mail.gmail.com>
> 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 --------------
> An HTML attachment was scrubbed...
>
>
> ------------------------------------------------------------------------------
> 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
> _______________________________________________
> 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.
>

------------------------------------------------------------------------------
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