Re: DRL problem
Mike <[email protected]>
| Newsgroups | gmane.comp.science.openeeg.general |
|---|---|
| Message-ID | <[email protected]> |
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