Re: DRL problem

Hi Mike,

Yes there is only one input to the IC201B (from the only one channel I have
in the design).

No there is no 0 with all short! I get negative saturation at the outuput
of IC201 and then the DRL output at -500mV. What may then be the problem?

Regards,

Andre

On Fri, Mar 8, 2013 at 9:45 AM, Mike <[email protected]> wrote:

> Hi Andre,
>
> I can see no problem with using LF412, or having 10M in parallel with C216.
>
> Is there only one input to IC201B in your version of the design?
>
> Have you checked that the DRL output is 0V when your EEG inputs are
> connected to DRL as described in the schematic?
>
> If the answer to both of these questions is "yes", then I cannot think of
> anything else to suggest - sorry.
>
> Regards,
>
> Mike
>
> ----- Original Message -----
> Date: Thu, 7 Mar 2013 21:48:59 +0000
> From: Andr? Ribeiro <[email protected]>
> Subject: Re: [Openeeg-list] DRL problem
> To: "Discussion of EEG hardware, software, training protocols,    NFB
>     theory - for developers and users."
>     <[email protected]>
> Message-ID:
>     <CALUfTPxwp1-1SNP-dsU8w46T+-KM+95azwQPr_C0MCOMsqpKyw@mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Still with problems people. Is there someone that can help?
>
> Regards,
>
> Andre
>
> On Thu, Mar 7, 2013 at 12:43 PM, Andr? 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 Andr? 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,
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> Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester
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> 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
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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