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Walls; a little bit of margin 76dd29636a Checkpoint in case of crashes Fix getting a bunch of diodes and support 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.instructables.com/Another-MIDI-to-CV-Box-/ yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a raspberry pi running a DAW with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 Battery holder for 2020, 2025 and 2032 coincell batteries. Http://www.keyelco.com/product-pdf.cfm?p=798 Keystone type 2998 battery holder for 18650 cylindrical cells http://www.keyelco.com/product.cfm/product_id/918 Keystone type 3001 coin cell vertical Panasonic CR-3032/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D508.PDF battery CR-3032 coin cell Panasonic CR-2477/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D502.PDF battery CR-2477 coin cell retainer SMT battery holder Keystone SMT (Auto-In/Ultra-Low) Holder for 2032 Cell, 33.2 x 23.9mm, 2mm height above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 3001 coin cell vertical Panasonic CR-1632-V1AN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D464.PDF battery CR-1632 coin cell retainer Keystone 3034 SMD battery holder for 18650 cylindrical cells http://www.keyelco.com/product.cfm/product_id/918 Keystone type 107 battery holder Keystone Battery Holder 18650 Battery Holder SMD Tactile Switch, http://www.helloxkb.com/public/images/pdf/TS-1187A-X-X-X.pdf Ultraminiature 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 ipc_noLead_generator.py QFN, 32 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/atmel-8153-8-and-16-bit-avr-microcontroller-xmega-e-atxmega8e5-atxmega16e5-atxmega32e5_datasheet.pdf#page=70), generated with kicad-footprint-generator ipc_noLead_generator.py WSON-10 package 2x3mm body, pitch 0.5mm UFBGA-64, 8x8 raster, 5x5mm package, pitch 0.65mm WLP-4, 2x2 raster, 0.73x0.73mm package, pitch 0.8mm TFBGA-121, 11x11 raster, 10x10mm package, 0.5mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=260, NSMD pad definition Appendix A BGA 676 1 FG676 FGG676 Spartan-7 BGA, 15x15 grid, 13x13mm package, pitch 0.8mm; see section 7.1 of http://www.st.com/resource/en/datasheet/stm32f401vc.pdf WLCSP-49, 7x7 raster, 3.141x3.127mm package, pitch 0.5mm UFBGA-64, 8x8 raster, 5x5mm package, pitch 0.8mm Altera BGA-68 M68 MBGA Altera BGA-153 M153 MBGA Altera VBGA V81 BGA-81 Altera BGA-100 M100 MBGA 121-ball, 0.8mm BGA (based on http://www.latticesemi.com/view_document?document_id=213 BGA 0.8mm 9mm 121 BGA-132 11x17 12x18mm 1.0pitch Altera BGA-144 M144 MBGA Altera UBGA U324 BGA-324 BGA-624, 25x25 grid, 21x21mm package, pitch 0.6mm; http://ww1.microchip.com/downloads/en/DeviceDoc/39969b.pdf Zynq-7000 BGA, 26x26 grid, 27x27mm package, 1mm pitch; https://www.xilinx.com/support/documentation/user_guides/ug475_7Series_Pkg_Pinout.pdf#page=304, NSMD pad definition Appendix A Virtex-7 BGA, 44x44 grid.

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