From: yaniv_vi (yaniv_vi_at_yahoo.com)
Date: 2002-01-12 00:36:28
hi
this is a really great idea , jim !
now without a computer , with a $100 eeg , and some speakers ,
a person could train in a few basic nfb protocols (deep meditation -
pull the sound down, beta -pull the sound up ) .
btw, GOOD LUCK sleeper ! hope you have no bugs :)
yaniv
--- In buildcheapeeg_at_yahoogroups.com, "Jim Meissner" <jpmeissner_at_mindspring.com> wrote:
> Dear Andreas:
>
> It is really getting there!
>
> My only request would be to provide an output from U3A. You
changed the op amp designation, so there is a mix-up. I see no
reason to have an output from the integrator (now called U3B). I
was requesting an output line from the ( now ) variable gain stage
with the 470 pf and 22 K feedback resistor. This line I would run
to the speakers for bio-feedback. Also during testing you can hook
a scope there for initial trouble shooting and probe testing.
>
> So how soon can we have some boards to play with?
>
> Your question about polypropylene, yes film capacitors are the
best. I worked for a company that made capacitors and the very best
were metalized Teflon.
>
> 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: sleeper75se
> To: buildcheapeeg_at_yahoogroups.com
> Sent: Friday, January 11, 2002 8:26 AM
> Subject: [buildcheapeeg] New input stage - v1.2
>
>
> Hi Jim and Joerg,
>
> I've uploaded version 1.2 of the input stage.
>
> Some tweaks, going from input to output:
>
> *FET-diodes are gone, resistors increased to 5.6Kohms.
> *4.7uF caps in the HP-stages are replaced with 1uF, non
electrolytics.
> *Added an output at U3B pin 7 (integrator output)
> *1nF is changed to 470pF in second gain stage. Bandwith should
be
> 12KHz.
> *Outputs were added around the 1K resistor in the second gain
stage,
> so that one may replace it with a potentiometer.
>
> Changes in the power filter:
>
> The resistors directly following the inductors are reduced to 10
ohms
> again and 100uF capacitors are added. This RLC-combination forms
a
> low-Q filter with a cutoff frequency around 150Hz.
>
> Since I want to allow low-voltage operation, the filters are now
in
> two branches rather than a bus. The resistors have changed to 75
> ohms, so the voltage is now 2.3V at Va when the battery voltage
2.6V.
>
> Does everything look ok now? I'd really like to start the
layout...
>
> /Andreas
>
>
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:36 BST