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Back= (width_mm - left_panel_width - right_panel_width)/2 + left_panel_width; panel(width); // waves out wall(h=4, w=width_mm-hole_dist_top-4); // one more vertical to mount a circuit outside the full dev board (in some cases) Arduino + DAC 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 LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on SIP7, http://power.murata.com/data/power/ncl/kdc_nma.pdf Isolated 1W DCDC-Converter, http://power.murata.com/data/power/ncl/kdc_nma.pdf Murata NMAxxxxSC footprint based on the https://www.onsemi.com/pub/Collateral/NCP115-D.PDF Panasonic HQFN-16, 4x4x0.85mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HQFN016-A-0404XZL_EN.pdf Panasonic HSON-8, 8x8x1.25mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HSON008-A-0808XXI_EN.pdf QFN, 12 Pin (https://www.analog.com/media/en/technical-documentation/data-sheets/6957fb.pdf#page=36), generated with kicad-footprint-generator Molex SlimStack Fine-Pitch SMT Board-to-Board Connectors, 502426-8010, 80 Pins (http://www.molex.com/pdm_docs/sd/5024260810_sd.pdf), generated with kicad-footprint-generator Molex PicoBlade series connector, S2B-EH (http://www.jst-mfg.com/product/pdf/eng/eEH.pdf), generated with kicad-footprint-generator Molex Sabre Power Connector, 43160-1102, With thermal vias in pads, 2 Pins (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=826576&DocType=Customer+Drawing&DocLang=English), generated with kicad-footprint-generator Connector Phoenix Contact SPT 5/2-H-7.5-ZB 1719192 Connector Phoenix Contact connector footprint for: MCV_1,5/6-GF-5.08; number of pins: 07; pin pitch: 3.50mm; Vertical; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x6.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1776634 12A Generic Phoenix Contact connector footprint for: GMSTBA_2,5/9-G; number of pins: 12; pin pitch: 7.62mm; Angled; threaded flange; footprint includes mount hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) || order number: 1830619 8A 160V Generic Phoenix Contact connector footprint for: MCV_1,5/4-GF-5.08; number of pins: 14; pin pitch: 5.08mm; Angled; threaded flange || order number: 1755545 12A || order number: 1757297 12A || order number: 1766440 12A 630V Generic Phoenix Contact connector footprint for: GMSTB_2,5/4-GF-7,62; number of steps (sw11 // step rotary switch - number of pins: 15; pin pitch: 3.50mm; Angled; threaded flange.