From: Jim Meissner (jpmeissner_at_mindspring.com)
Date: 2001-12-22 20:01:45
Dear sademade:
It is not static! It is from the muscle EMG signal of chewing. I meant toindicate how sensitive this is to all manner of artifacts.
> Would tranzorbs be unuseable here, too much leakage etc ?
Yes, way, way too much.
> Perhaps one can build a
> small "shielded helmet" ....
Did you not read my comment to Andreas about the "whole body" being an ANTENNA picking up the 60 Hz hum?
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: sademade
To: buildcheapeeg_at_yahoogroups.com
Sent: Saturday, December 22, 2001 2:18 AM
Subject: [buildcheapeeg] Re: My Input Stage ... Teeth static ? Copper-foil-helmet for gamma ?
>That frequency response is out to 15 KHz. I wanted to hear
>everything. When you chew food or frown, it makes an awful racket.
But, how much of that is coming from the static electrcity of
the teeth, and how little from the brain, in those 2 instances :-> ?
>My purpose was to protect the input stage from feet on carpet type
>of ESD.
Would tranzorbs be unuseable here, too much leakage etc ?
>Many brain wave monitors solve this by providing a steep 60 Hz notch
>filter and using a sharp cutoff lowpass filter. During my research
>I wanted to know what the brain was doing in these frequency ranges,
>so that was not an option.
Gamma frequencies look very important. Perhaps one can build a
small "shielded helmet" with copper-foil around an integral
motor-bike helmet, and using conducted audio instead of
headphones, and using optical fibers to conduct visual to
the eyes, to prevent induced interferences, and perhaps a soft
piece to bite on to silence the teeth static voltages would also
help ... ?
Of course I am sure you tried this too, just comes out as the
first obvious thing to reduce the induced voltages in a fairly
easy and cheap way ...
Sade M.
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:36 BST