Re: DRL problem

 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 --------------
>  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 [6]
>  _______________________________________________
>  Openeeg-list mailing list
>  [email protected] [7]
>  https://lists.sourceforge.net/lists/listinfo/openeeg-list [8]
>  Go to the above address to change your
>  subscription options, e.g unsubscribe.
>
>
>
> Links:
> ------
> [1] mailto:[email protected]
> [2] http://openeeg.sourceforge.net/doc/modeeg/modEEGamp-v1.0.png
> [3] mailto:[email protected]
> [4] mailto:[email protected]
> [5]
> 
> mailto:CALUfTPz%[email protected]
> [6] http://p.sf.net/sfu/symantec-dev2dev
> [7] mailto:[email protected]
> [8] https://lists.sourceforge.net/lists/listinfo/openeeg-list


------------------------------------------------------------------------------
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.