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0.5 CP236 CPG236 Artix-7 BGA, 22x22 grid, 19x19mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=79, NSMD pad definition Appendix A BGA 225 0.8 CSGA225 Spartan-7 BGA, 15x15 grid, 13x13mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=79, NSMD pad definition Appendix A Virtex-7 BGA, 34x34 grid, 35x35mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=93, NSMD pad definition Appendix A BGA 1156 1 FF1157 FFG1157 FFV1157 FF1158 FFG1158 FFV1158 Virtex-7 BGA, 44x44 grid, 45x45mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug865-Zynq-7000-Pkg-Pinout.pdf#page=95, NSMD pad definition Appendix A BGA 400 0.8 CLG400 CL400 Zynq-7000 BGA, 22x22 grid, 23x23mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=301, NSMD pad definition Appendix A BGA 484 0.8 RS484 Artix-7 BGA, 22x22 grid, 19x19mm package, 0.8mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=262, NSMD pad definition (http://www.ti.com/lit/ds/slas718g/slas718g.pdf, http://www.ti.com/lit/an/snva009ag/snva009ag.pdf Texas Instruments, QFM MOF0009A, 6x8x2mm (http://www.ti.com/lit/ml/mpsi063a/mpsi063a.pdf QFN, 41 Pin (http://www.ti.com/lit/ml/mpqf506/mpqf506.pdf QFN, 28 Pin (https://www.cmlmicro.com/wp-content/uploads/2017/10/CMX901_ds.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502430-2010, 20 Pins per row, Mounting: PCB Mounting Flange (http://www.molex.com/pdm_docs/sd/039291047_sd.pdf), generated with kicad-footprint-generator Hirose FH12, FFC/FPC connector, AFC07-S06FCA-00, 6 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Molex SPOX Connector System, 53047-0510, 5 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0694-9-81&productname=DF12C(3.0)-50DS-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000994748), generated with kicad-footprint-generator Molex CLIK-Mate top entry Molex Pico-Clasp series connector, SM04B-GHS-TB (http://www.jst-mfg.com/product/pdf/eng/eGH.pdf), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-0830, 8 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 Harwin Female Vertical Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89007xx, 7 Pins per row (https://www.hirose.com/product/document?clcode=CL0537-0834-6-81&productname=DF12E(3.0)-50DP-0.5V(81)&series=DF12&documenttype=2DDrawing&lang=en&documentid=0000992393), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-119-02-xxx-DV-BE-A, 19 Pins per row (http://www.molex.com/pdm_docs/sd/1053101208_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with double feed through strain relief, for a big part of knob (in mm). If you don't need a diode matrix to select segments from each step. Could add a global/master pitch control/modulation function with a capacitor / resistor pair, see Fireball's hard sync to schematic, laid out PCB with exploratory 8hp layout 0d370a24cdcaf6d3fd7f0316855522b79df0fe9a 3583986e89 Finished PCB, passes all passable DRCs Footprint selection, some PCB layout choices 4d8e233e93 Add CV in to pause the clock oscillilator an external clock. One idea: add a voltage to another voltage. Useful here.

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