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Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, wide, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot371-1_po.pdf STC SOP, 16 Pin (JEDEC MO-153 Var HD https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Molex LY 20 series connector, B11B-EH-A (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Harwin Male Horizontal Surface Mount Double Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7810645.

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