Re: EEG-SMT

Hi all

I was debugging my EEG-SMT this weekend also.  The impedance seems to be
the issue.  By shorting out the DRL and the electrodes I get a perfectly
flat signal.

I also tried putting the EEG on a cantaloupe.  The impedance was low enough
that the signals stabilized and started making noisy little orbits around
0, but I really had to hold the electrodes tightly.

One thing that I didn't like:  once you lose the signal and re-establish
the connection, it takes about 10 seconds for the signal to stabilize
again.  I am hoping to use the EEG-SMT for live performances, and it may be
disrupting it takes too long to re-estabilsh connection.  However, I don't
know what to do about it yet.  Probably the best thing is not to lose
connection in the first place.

I'm still thinking about how to modify the electrodes.  I think it would be
useful to add sponges+electrolyte solution to keep the impedance low.
Anybody else thinking about modifying the electrodes now?

Chuck

On Mon, May 27, 2013 at 6:10 PM, Niels Samuels <[email protected]>wrote:

> Hi Alexandre,
>
> I've managed to get a good signal with the device but only with all four
> (if using both channels) of the active electrodes on the forehead using a
> "fairly tight" headband and holding the DRL in my hand or stuck under the
> headband as well. Also I can only work with the device using a laptop
> running on the battery (no mains) and using a high quality usb cable. I'm
> then able to obtain a signal with fairly low mains interference.
>
> Hope this helps.
>
> Kind Regards,
>
> Niels
>
> On Mon, May 27, 2013 at 9:27 PM, Alexandre Dubreucq <
> [email protected]> wrote:
>
>> Hello everyone,
>>
>> I got myself a OLIMEX EEG-SMT device, and i can't get it to work
>> properly : the signal is very messy, and if i take off one electrode,
>> nothing changes on the signal in the software (using brain bay or
>> elecguru for example).
>>
>> Has someone already managed to have some results using OLIMEX EEG-SMT
>> ? If yes, how did u fix the electrodes on your head ?
>>
>> Thanks
>>
>>
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>
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