From: arethereanytagsleft (joss_at_patrol.i-way.co.uk)
Date: 2002-01-28 18:53:03
> Can someone point out to me a good tested input stage that I can
build
> without etching anything or programming any microcontrollers and
which
> will work as I hope (for basic testing using soundcard input), or
else
> give me a good reason why I should forget it ?
Here http://groups.yahoo.com/group/buildcheapeeg/files/StandAlone.gif
is a diagram for a simple standalone eeg. As drawn, it
doesn't plug into a computer, it lights up a bunch of LEDs according
to frequency. However, rather than building the full circuit, you
can probably leave out the lower half and just build
the top half. You will need a resonator to mimic the signal
being fed into line 18 of the LTC1068 chip (this is the only place
where signal from lower half feeds into upper half).
I too am a software engineer and am almost entirely ignorant
of hardware, so I am in similar position - I need a simple
circuit so I can get started on hardware side.
The top half of circuit does filtering and amplification. The
16C73 chip in bottom half does ADC + FFT, but it *might* be
possible to use soundcard as input into computer, ie take
the signal being fed into line 2 of the 16C73 chip and feed that
to line in on your soundcard.
I was ready to build this, but heard soundcard was not viable - YMMV
It now looks like I can pick up a 2nd hand
<a href=http://www.ibva.com>IBVA</a> instead, which will give me
what I need to start writing software.
[Still trying to figure out how to post with attachments using
F"$Ģing yahoo :( ]
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:37 BST
