You are correct! it's almost ancient design but I had designed and built an EEG (which requires much better signal quality than an ECG) w/16+channels and had very promising results. I was just having fun then but that specifi= c design is now went commercial and used in a couple of local clinic here in Istanbul. I am still working on this very problem (detection of electric fields very small in magnitude and low in frequency) as my MSc thesis and there is progress, if someone is interested in drop me an email if I like your name I will reply (: Btw, you can go with TLC272 as well, a cheaper yet stable alternative for INA series.Even they are completely different purpose products, both have very close responses in this specific application. Hope this helps! On Thu, Jan 27, 2011 at 8:14 AM, N. T. wrote: > V G wrote: > > > > Is that "Trust no one, as in nobody", or "Trust number 1"? > > > > And so you wouldn't recommend TI INS1xx? > > -- > > It was a joke :-) > Regarding TI INS1xx, - I don't know. The Op Amp is sort of two decades > old. Just google with "precision instrumentation amplifier" and figure > out on your own whether the industry gave birth to the Op Amp that > fits better your needs. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .