From: sleeper75se (sleeper75se_at_yahoo.se)
Date: 2002-01-17 16:46:33
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
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:36 BST