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Accordingly C3 and C4 could use larger spacing on the footprint. Some options: ## Kassutronics Precision ADSR build notes The build is pretty straightforward except for mechanical assembly, and one 16-pin IC. But 3 panel-mounted UI elements for every step (plus some others), so plenty of room for a 1uF capacitor; expand a bit, but also size it for a single 0.1 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 2.3mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310591_RT063xxHBWC_OFF-022684T.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity THT Terminal Block 4Ucon ItemNo. 10694, vertical (cable from top), 4 pins, pitch 3.5mm, size 28.7x7mm^2, drill diamater 1.2mm, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00287_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00247, 8 pins, pitch 10.2mm, size 117x8.3mm^2, drill diamater 1.5mm, 2 pads, pad diameter 2.5mm, see http://cdn-reichelt.de/documents/datenblatt/C151/RND_205-00023_DB_EN.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_Phoenix THT Terminal Block Phoenix PT-1,5-4-3.5-H pitch 3.5mm size 21x6.5mm^2 drill 1.2mm pad 2.4mm Terminal Block 4Ucon ItemNo. 10688 pitch 3.5mm size 11.2x7mm^2 drill 1.2mm pad 3mm Terminal Block WAGO 236-202, 45Degree (cable under 45degree), 5 pins, pitch 5mm, size 15x9mm^2, drill diamater 1.15mm, pad diameter 2.6mm, see http://www.mouser.com/ds/2/324/ItemDetail_1935161-922578.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00004, 5 pins, pitch 5mm, size 10x10mm^2, drill diamater 1.3mm, pad diameter 2.2mm, see http://www.mouser.com/ds/2/324/ItemDetail_1725672-916605.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_MetzConnect THT terminal block RND 205-00306, 10 pins, pitch 10mm, size 85x10.3mm^2, drill diamater 1.3mm, pad diameter 3mm, size source Multi-Contact FLEXI-E 1.0 (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 CLIK-Mate series connector, 502386-1070 (http://www.molex.com/pdm_docs/sd/5023860270_sd.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py 10-Lead Plastic Dual Flat, No Lead Package (ML) - 8x8x0.9 mm Body [UDFN] (see Atmel-8815-SEEPROM-AT24CS01-02-Datasheet.pdf DFN, 8 Pin (https://www.onsemi.com/pub/Collateral/NUF4401MN-D.PDF#page=6), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin (https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 20 Pin (http://www.ti.com/lit/ds/symlink/opa569.pdf, http://www.ti.com/lit/an/slma004b/slma004b.pdf), generated with kicad-footprint-generator connector wire 0.127sqmm double-strain-relief Soldered wire connection, for 6 times 2.5 mm² wires, basic insulation, conductor diameter 1.4mm, outer diameter 1.7mm, outer diameter 1.7mm, outer diameter 3.9mm, size source Multi-Contact FLEXI-xV 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 WDFN, 6 pin, https://www.winsen-sensor.com/d/files/semiconductor/mq-6.pdf Sensair S8 Series CO2 sensor, 1kHz PWM output, Modbus, THT co2 gas sensor pwm modbus Sensirion SCD4x QFN, 20 Pin (https://pdfserv.maximintegrated.com/package_dwgs/21-0108.PDF U20E-1), generated with kicad-footprint-generator JST SUR series connector, B8P-VH-B (http://www.jst-mfg.com/product/pdf/eng/eVH.pdf), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502426-6010, 60 Pins (http://www.molex.com/pdm_docs/sd/547220804_sd.pdf), generated with kicad-footprint-generator Molex KK 396 Interconnect System.

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