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  1. tazzz
    Hello,I upper Jfet functions as an "impedance multiplier" John broskie explains the workings of this circuit in detail. (there are more discussions on it on his site)http://www.tubecad.com/2009/10/blog0174.htmIn short the reason to reduce the upper "sense" resistor is that in effect the inverse of the upper jfets transconductance is in series with already.
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