From: Jim Meissner (jpmeissner_at_mindspring.com)
Date: 2002-01-17 18:08:26
Dear Andreas:
I just downloaded your latest work. Wonderful, Wonderful, Wonderful!
Think the SMT TinyEEG board is great because you can use one board for a single channel machine, or two boards for right and left hemisphere.
My interest would be to add several more boards for EKG, GSR, temperature, respiration rate, etc.
The eight channel 12 bit board looks good. I would guess that this is bipolar input so the TinyEEG input-boards hook directly to the A/D board.
Can you make the TinyEEG boards in your kitchen?
What can I do to help with the project.
I would be willing to build and test.
I would be willing to "try" to make boards if you send me the "negatives".
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: Thursday, January 17, 2002 11:46 AM
Subject: [buildcheapeeg] New schematic and layout
Hi all,
A schematic and layout for a surface mount input stage amplifier is
finished and uploaded. One channel is 56x31 mm. This is what I will
start building, though NP0-capacitors are quite expensive - $2 each
at Digikey (you need 6 per channel). If one does not care about some
distortion and temperature dependence, X7R-capacitors are cheaper
($0.18 each). Please note that the resistor and capacitor values used
in the filter are incorrect at the moment. Resistances should be 10
times larger, and capacitances 10 times smaller.
I've also uploaded a schematic for an 8-channel 12-bit ADC +
microcontroller combination, SMT-layout is on its way. Is there
anything you think I might have missed?
All files are in the files section:
http://groups.yahoo.com/group/buildcheapeeg/files/hardware%
20design/TinyEEG%20-%20SMT/
The link is probably not clickable because yahoo wraps the text, so
you'll have to cut and paste.
/Andreas
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This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:36 BST