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Essentially a 4-stage RC network but with buffering between (some) stages. Needs a _big_ knob, these are some setup variables... You probably won't need to research further. Aisler - Germany; $16.04 per board with shipping for 128.5mm x 100mm, from pcbshopper JLCPCB - China, included for reference. $5.89/board, from pcbshopper Lion .

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