Analog Devices has a lot of IAs products.
AD620 for 1-10k gain range, AD622, AD623 for 1-1k. Prices around 7
USD a piece. Newark usually has them in stock.

Cosmin



Brian Kraut wrote:
>
> I am working on an alarm that trigers off of an analog voltage.  I need
> a very high input impedance on the analog voltage so I won't affect the
> circuitry down the line from where I am picking the voltage off.  My
> thought was to use an instrumentation amplifier in the standard
> configuration with three op amps.
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