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>Doh!! Mouser does stock the CA3140.
>1) Single-packaged very high-impedance op-amp for the sample & hold.
>Ken used LF356, and suggests a CA3140 which has an input impedance of
>1.5T!! The problem is that Digikey and Mouser do not stock CA3140.
>Jameco and JDR sell them, but then shipping gets expensive.