Some time ago TAPR did a one-time run of a very low noise, very high
isolation buffer amplifier. The assembled boards are sold out, but we
had some extra blank boards made and finally (after a long story) got
those delivered from Hungary to the office.
If you're interested in a TNS-BUF board, they are $15 plus shipping and
you can order via the button at http://tapr.org/kits_tns-buf.html
I'm working on a publishable bill of materials for the parts to stuff
the boards, and will put a link to it on that web page ASAP.
John
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