attempted to use the smd j-fets for the high ohmic OpAmp input but they start failing (at that) at about 80kΩ input -- top-down : each previous has some drawbacks !
about : http://www.analog.com/en/analog-dialogue/articles/tips-on-making-fetching-discrete-amplifier.html , http://www.cordellaudio.com/JFETs/LSK489appnote.pdf
quick 5V mod.
[Eop]
about : http://www.analog.com/en/analog-dialogue/articles/tips-on-making-fetching-discrete-amplifier.html , http://www.cordellaudio.com/JFETs/LSK489appnote.pdf
quick 5V mod.
[Eop]
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