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BackDAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a gate. If nothing is plugged into the gate input, indefinitely. This can be painted. CapType = 1; top_margin = (board_height - hole_vdist) / 2; standoff_radius = hole_radius * 2.5; Latest commits for file Images/IMG_6753.JPG **Untested hardware and software — Do not connect the Normal pin for op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF ~$8 in parts, depending on exact order number), See: http://katalog.we-online.de/em/datasheet/6941xx301002.pdf Compact Flash Card connector, polarization inverse (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf Compact Flash Card connector, polarization inverse (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf Compact Flash Card connector, polarization inverse (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf Compact Flash Card connector, polarization inverse (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf Compact Flash Card connector, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf SD, SMD, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Memory Card Connector, Hinge Type, https://www.molex.com/pdm_docs/sd/472192001_sd.pdf BNC coaxial connector vertical, Amphenol 031-71059, https://www.amphenolrf.com/library/download/link/link_id/594427/parent/031-5539/ Würth WR-SMA PCB SMT Jack, Horizontal (https://www.we-online.com/components/products/datasheet/66011102111302.pdf Jushuo AFC07, FFC/FPC connector, 10 bottom-side contacts, 1.0mm pitch, 1.0mm height, SMT, http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=84952&DocType=Customer+Drawing&DocLang=English&DocFormat=pdf&PartCntxt=84952-4 TE FPC connector, 26 top-side contacts, 0.5mm pitch, 1.2mm height, https://www.molex.com/pdm_docs/sd/545481071_sd.pdf Molex Molex 1.00mm Pitch Easy-On BackFlip, Right-Angle, Bottom Contact FFC/FPC, 200528-0190, 19 Circuits (https://www.molex.com/pdm_docs/sd/2005280190_sd.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py MSOP, 10 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/00001725D.pdf (Page 9)), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-139-02-xxx-DV-BE, 39 Pins per row (https://www.hirose.com/product/en/products/DF13/DF13-2P-1.25DSA%2850%29/), generated with kicad-footprint-generator Molex Pico-Clasp series connector, LY20-30P-DLT1, 15 Circuits (http://www.jae.com/z-en/pdf_download_exec.cfm?param=SJ103130.pdf), generated with kicad-footprint-generator Soldered wire connection, for 3 times outer diameter, generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 53748-0608, 60 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator JST EH series connector, 53398-0471 (http://www.molex.com/pdm_docs/sd/533980271_sd.pdf), generated with kicad-footprint-generator connector Molex Pico-EZmate series connector, 502494-0470 (http://www.molex.com/pdm_docs/sd/5024940270_sd.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-131-02-xxx-DV-BE-A, 31 Pins per row (http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=82181_SOFTSHELL_HIGH_DENSITY&DocType=CS&DocLang=EN), generated with kicad-footprint-generator ipc_noLead_generator.py VQFN, 48 Pin (JEDEC MO-153 Var AC https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator Molex KK 396 Interconnect System, old/engineering part number: 22-27-2101.
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