From: sleeper75se (sleeper75se_at_yahoo.se)
Date: 2001-12-06 11:59:57
--- In buildcheapeeg_at_yahoogroups.com, "Jim Meissner" <jpmeissner_at_mindspring.com> wrote:
> where you are, and the result of my research is not a great
> EEG machine but rather the Synchronizer which is a training tool.
> You will see - feel results in days rather than years.
Hello Jim,
thanks for the offer, but I've already bought one of them expensive
meditation-by-binaural-beats CD's. Now I need some sort of feedback
to see if it really works for me, that's part of what the EEG-meter
is for. I'm beginning to feel that I'm impervious to binaural
beats. :-)
> explaining how the brain works. Feeding certain tones or
> frequencies to the ears or even the eyes, does "not" show up
> in brainwaves! The theory of the frequency following response
> does not work.
Then, how does your Synchronizer work? Isn't the theory of binaural-
beats pretty well founded? Monroe (inventor of 'Hemi-sync') et.al.
usually refers to an article in Scientific American from 1973 by G.
Oster, so there has to be some merit to it?
> The Wave Rider does that very nicely already.
> It will be much less expensive to buy that than build your own.
I've played with the Waverider's software, so I'm using that as a
template for my own. Buying it is out of the question I'm afraid, i
can't afford the $1700.
>> http://groups.yahoo.com/group/buildcheapeeg/files/hardware%
>> 20design/PDF_and_PNG_schematics/Active-electrodes.pdf
> I clicked this and got an error. Tell me more about your idea.
This file is on the buildcheapeeg board, in the files section under
hardware design, so you can find it there. What kind of error did you
get?
Since there have been comments on the signal-to-noise-ration on this
board, please see (hope the link works)
http://www.biosemi.com/publications/artikel1.htm
for a discussion of the design.
My design is basically theirs, but since they didn't print the
resistor values I had to figure them out for myself. I also changed
the frequency response to achieve pure AC-input. To that design I've
added a right-leg-drive feedback circuit. They claim 136 dB CMRR
without trimming...
> Simulating is only useful for proving something that already works,
> works. I am one for building it to see how (or even if) it works.
Agreed. I'm in the process of building them now, though I need to
find an opamp with low offset, noise AND high input impedance. At
reasonable cost. :-)
> I will be happy to give you the schematic of my amplifier to try.
Thank you! Will you post it on your website?
/Andreas
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