Re: [buildcheapeeg] Re: Soundcard Interface

From: Jim Meissner (jpmeissner_at_mindspring.com)
Date: 2002-01-24 21:14:53


Dear John:

Let us for the moment assume that it was possible to build a circuit that
would feed directly into the sound card.

Do "you" have a "free" program that will analyze the 1 to 50 Hz data and do
an FFT display etc.?
( I have seen commercial programs for about $400.00 that can do that. )
Or do you have the source code for such?
Or could you write this source code?
Or is there anyone on this list who can?

If so, then we might have a reason to talk about the "Soundcard" some more.

I have built an EEG device interface that could work for this, but this
might be step in the wrong direction as it would limit the expansion to the
two channels.

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: John Morrison <jmorrison_at_ahc.net.au>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Thursday, January 24, 2002 12:00 AM
Subject: RE: [buildcheapeeg] Re: Soundcard Interface

> This sounds interesting and CHEAP and would make a good starter for anyone
> interested in getting into EEGs. :-)
>
> Is it possible to design the input and isolation CCTs so they can used
with
> either system?
>
> IF possible this means that a user could construct the input & isolation
> CCTs, connect it to the sound card and get a taste before going all out.
:-)
> And use the same CCTs when going to the FULL EEG experience. :-)
>
> John Morrison
>
>
>
> > -----Original Message-----
> > From: sleeper75se [mailto:sleeper75se_at_yahoo.se]
> > Sent: Thursday, 24 January 2002 12:31 PM
> > To: buildcheapeeg_at_yahoogroups.com
> > Subject: [buildcheapeeg] Re: Soundcard Interface
> >
> >
> > --- In buildcheapeeg_at_yahoogroups.com, "Fil Laborde" <fil_at_rezox.com> wrote:
> > > Guys!
> > >
> > > I've been asking around and here's the email I got from someone
> > > who is part of an organization dealing with ELF Antennae.
> > > Basically he is saying that there are many analog circuit junkies
> > > who use soundcards to display signals in the ELF range (although
> > > they are getting the signals from antennae, ie submarine
> > > transmissions).
> > >
> > > So my question is, then, why not pursue an option of using the
> > > quality electronics created here UPTO the bandpass section, and
> > > then feed that into a soundcard and not bother with the complexity
> > > of rebuilding the ADC, and parallel port communications parts. This
> > > may give more flexibility to future possibilities?
> >
> > Hi Fil,
> >
> > Well, you are welcome to try. :-) I've designed, and Joerg Hansmann
> > is designing, input stages, so that's already taken care of. However,
> > you do need some kind of analog optical isolation between that and
> > the PC for safety reasons.
> >
> > Pesonally, I only have time for the 8-channel device I'm working on,
> > but I'd be happy to give you advice and feedback on such a design.
> > You could probably ask any analog designer for help though, it is not
> > a very complex problem.
> >
> > Best Regards,
> >
> > Andreas
> >
> >
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> >
> >
> >
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> >
> >
> >
>
>
>
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