They are on sale at www.passdiy.com ... alternately, the pattern is in the pdf file and you can use this to make your own boards.
FWIW: I use a ZEN V4 with 10 K input resistance and 47 K feedback || 22 pF (and with BS250 instead of ZVP....) and it works just fine. I don't have the schematics in front of me so not sure if they are R2/R3.
From what I remember this mostly increases the BW in the buffer stage and hence the overall circuit.
From what I remember this mostly increases the BW in the buffer stage and hence the overall circuit.
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