From: Jim Meissner (jpmeissner_at_mindspring.com)
Date: 2001-12-04 21:15:04
Dear Laura:
> Also, Jim's page states that his firmware supports a 0-60 Hz
> frequency range, while your page states he achieved a band width of
> 0.1-100 Hz. Can you clarify this for me?
The 3 byte or 2 channel version (a8.asm) can run much faster. I believe I was able to see 0-200 Hz. To my disappointment, I saw no data above 50 Hz (with my electrode placement) so I reduced the sampling rate and went to 4 channels (a9.asm) instead. At that time, working with a 386 computer, timewas a "real" problem.
Have you run the program (slink12r) and (egavga.bgi) that I put on my webpage? Log001.dat is a test file and Downey.dat is a very interesting sessionwith a gifted medium.
I will be glad to share my input amplifier schematic. What format do you want?
The input amp I used is the Texas Instrument TL084. I think I paid about $1 ea. This is not the very best amp available, but it did the job that I needed to do at the time.
Juergen P. (Jim) Meissner
Check out my Website at www.MeissnerResearch.com
Read about the benefits of the Brain State Synchronizer sounds for improving your life and health.
----- Original Message -----
From: ldean_at_metrowerks.com
To: buildcheapeeg_at_yahoogroups.com
Sent: Tuesday, December 04, 2001 2:18 PM
Subject: [buildcheapeeg] Re: New Info on Various Schematics
Doug,
Under "design with a minimal number of parts" you link to
www.biosemi.com while next under "modeled after the Biosemi designs"
you link to www.biosemi.com/publications/artikel7... perhaps these
are reversed? You said before that Joerg's design is based on the
Biosemi design; can someone clue me in to which Biosemi design it is
based on?
Also, Jim's page states that his firmware supports a 0-60 Hz
frequency range, while your page states he acheived a band width of
0.1-100 Hz. Can you clarify this for me?
I priced the op-amps in the low part count design at digikey at about
$20 - $25 for one channel (resistors and capacitors not included).
The op-amps in the Brainmaster look like they would cost about $10,
but it's hard to tell because they are only sold from digikey in
units of 100 or more. Of course, I am also eager to see Jim's circuit
- especially if it can detect an extra 60 Hz of data over the Biosemi
design.
Laura
--- In buildcheapeeg_at_yahoogroups.com, Doug Sutherland <wearable_at_earthlink.net> wrote:
> I added some brief descriptions next to all of the EEG
> schematics on my site that make it easy to see how all
> of various circuits differ and what parts they use. I
> also added a schematic for an EEG that includes a tone
> generator and uses potentiometers to set thresholds.
>
> http://home.earthlink.net/~wearable/biopsy/#schematics-eeg
>
> -- Doug
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> The human-computer interface seems to be stuck on the
> WIMP (windows, icons, menus, pointer) model. What I'd
> like is to have you call me and my clothing answers.
>
> http://home.earthlink.net/~wearable/jacket-wearable.html
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:32 BST