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Another version 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, narrow, oval pads, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot552-1_po.pdf 14-Lead Plastic Thin Quad Flatpack (MW) - 10x10x1.0 mm Body [TSSOP] with exposed pad (https://www.infineon.com/cms/en/product/packages/PG-DSO/PG-DSO-20-87/ 12-Lead Plastic Micro Small Outline (SSO/Stretched SO), see https://www.vishay.com/docs/83831/lh1533ab.pdf SSO Stretched SO SOIC 2.54 8-Lead Plastic DFN (4mm x 3mm) (see Linear Technology DFN_8_05-08-1718.pdf DFN, 8 Pin (https://www.onsemi.com/pub/Collateral/509AF.PDF), generated with kicad-footprint-generator ipc_gullwing_generator.py SOP, 16 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-lqfn/05081595_0_lqfn16.pdf), generated with kicad-footprint-generator JST PUD series connector, SM16B-ZESS-TB (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py WDFN, 8 Pin (https://datasheet.lcsc.com/lcsc/2303241700_Zetta-ZDSD64GLGEAG-R_C5277948.pdf#page=17), generated with kicad-footprint-generator Hirose DF11 through hole, DF13-05P-1.25DS, 5 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 Soldered wire connection, for 5 times 0.75 mm² wires, reinforced insulation, conductor diameter 2.4mm, outer diameter 2.7mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator Molex PicoBlade series connector, 202396-1507 (http://www.molex.com/pdm_docs/sd/2023960207_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SSOP-8 3.95x5.21x3.27mm Pitch 1.27mm Slug Up (PowerSO-20) [JEDEC MO-166] (http://www.st.com/resource/en/datasheet/vn808cm-32-e.pdf, http://www.st.com/resource/en/application_note/cd00003801.pdf HSOP 11.0x15.9mm Pitch 0.65mm HSOP 11.0x15.9mm Pitch 1.27mm Slug Down Thermal Vias (PowerSO-36) [JEDEC MO-166] (http://www.st.com/resource/en/datasheet/tda7266d.pdf, www.st.com/resource/en/application_note/cd00003801.pdf HSOP 11.0 x 15.9mm Pitch 1.27mm Slug Up (PowerSO-20) [JEDEC MO-166] (http://www.st.com/resource/en/datasheet/tda7266d.pdf, www.st.com/resource/en/application_note/cd00003801.pdf HSOP, 32 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8209-8-bit%20AVR%20ATmega16M1-32M1-64M1_Datasheet.pdf#page=426), generated with kicad-footprint-generator Molex SPOX Connector System, 43045-0421 (alternative finishes: 43045-142x), 7 Pins per row, Mounting: (http://www.molex.com/pdm_docs/sd/039281043_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for 4 times 2.5 mm² wires, reinforced insulation, conductor diameter 1.7mm, outer diameter 1.7mm, size source Multi-Contact FLEXI-E 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 52 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-qfn/QFN_52_05-08-1729.pdf), generated with kicad-footprint-generator JST VH series connector, 14110613002xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13002XXX_100228421DRW035C.pdf), generated with kicad-footprint-generator JST PUD series connector, 502443-0270 (http://www.molex.com/pdm_docs/sd/5024430270_sd.pdf), generated with kicad-footprint-generator connector JST SH series connector, B08B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator JST PH series connector, DF52-11S-0.8H (https://www.hirose.com/product/en/products/DF52/DF52-3S-0.8H%2821%29/), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-141-02-xxx-DV-LC, 41 Pins per row (https://cdn.harwin.com/pdfs/M20-781.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 2 times 0.127 mm² wires, reinforced insulation, conductor diameter 2.4mm, see http://www.4uconnector.com/online/object/4udrawing/19965.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_RND THT terminal block RND 205-00250 pitch 10.2mm size 45.7x8.3mm^2 drill 1.3mm pad 2.5mm terminal block Metz Connect Type055_RT01503HDWU.

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