Check out the Burr Brown INA117.  It is a unity gain differential
amplifier with a common mode input range of +/- 200V.

Harold


Harold Hallikainen
harold@hallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

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