Re: DRL problem

Still with problems people. Is there someone that can help?

Regards,

Andre

On Thu, Mar 7, 2013 at 12:43 PM, André Ribeiro <[email protected]> wrote:

> 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 --------------
>> >  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.
>>
>
>

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