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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 the https://www.onsemi.com/pub/Collateral/NCP115-D.PDF Panasonic HQFN-16, 4x4x0.85mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HQFN016-A-0404XZL_EN.pdf Panasonic HSON-8, 8x8x1.25mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HSON008-A-0808XXI_EN.pdf QFN, 12 Pin (https://ww1.microchip.com/downloads/aemDocuments/documents/APID/ProductDocuments/DataSheets/MIC2207-2MHz-3A-PWM-Buck-Regulator-DS20006470A.pdf#page=22), generated with kicad-footprint-generator JST PHD series connector, (https://www.stocko-contact.com/downloads/steckverbindersystem-raster-2,5-mm.pdf#page=15), generated with kicad-footprint-generator Molex Mini-Fit Jr. Power Connectors, 105309-xx06, 6 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py HVQFN, 24 Pin (JEDEC MO-153 Var AE https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST PH series connector, B14B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 10, Wuerth electronics 9774080951 (https://katalog.we-online.de/em/datasheet/9774080951.pdf), generated with kicad-footprint-generator Harwin Male Horizontal Surface Mount Bridge Rectifier Diode SMD 1812 (4532 Metric), square (rectangular) end terminal, IPC_7351 nominal with elongated pad for handsoldering. (Body size source: http://www.tortai-tech.com/upload/download/2011102023233369053.pdf), generated with kicad-footprint-generator Harwin Male Horizontal Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-7811245, 12 Pins (http://www.molex.com/pdm_docs/sd/559350210_sd.pdf), generated with kicad-footprint-generator JST SH series connector, BM24-40DP/2-0.35V (https://www.hirose.com/product/en/download_file/key_name/BM24/category/Catalog/doc_file_id/47680/?file_category_id=4&item_id=50&is_series=1 connector Hirose DF13 horizontal Hirose FH12, FFC/FPC connector, FH41-30S-0.5SH, 30 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-139-02-xx-DV-TE, 39 Pins per row (https://cdn.harwin.com/pdfs/M20-890.pdf), generated with kicad-footprint-generator Mounting Hardware, external M3, height 3.1, Wuerth electronics 9775096960 (https://katalog.we-online.com/em/datasheet/9775096960.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, 78171-0005 (http://www.molex.com/pdm_docs/sd/781710002_sd.pdf), generated with kicad-footprint-generator JST ZE side entry JST AUH side entry JST XA series connector, B14B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 18 Pin (https://toshiba.semicon-storage.com/info/docget.jsp?did=30523), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 4 times 0.1 mm² wires, basic insulation, conductor diameter 2.4mm, outer diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block WAGO 236-509 45Degree pitch 5mm size 25x9.8mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-505, 45Degree (cable under 45degree), 7 pins, pitch 5mm, size 55x7.6mm^2, drill diamater 1.3mm, pad diameter 3mm, see http://www.produktinfo.conrad.com/datenblaetter/550000-574999/556441-da-01-de-LEITERPLATTENKL__PTSM_0_5__8_2_5_H_THR.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block Metz Connect 360410 size 5x5mm^2 drill 1.5mm pad 3mm Terminal Block Phoenix MPT-0,5-3-2.54, 3 pins, pitch 5.08mm, size 10.2x11mm^2, drill diamater 1.5mm, 2 pads, pad diameter 3mm, see , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block TE 282834-5, 5 pins, pitch 5mm, size 72.3x14mm^2, drill diamater 1.15mm, pad diameter 2.6mm, see http://www.4uconnector.com/online/object/4udrawing/10699.pdf, script-generated with , script-generated with , script-generated with , script-generated with , script-generated with , script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_WAGO THT Terminal Block Phoenix MKDS-3-11-5.08 pitch 5.08mm size 10.2x10.6mm^2 drill 1.3mm pad 2.6mm Terminal Block WAGO 236-106.

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