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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 http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, 27.0x27.0mm, 756 Ball, 32x32 Layout, 0.8mm Pitch, https://www.st.com/resource/en/datasheet/stm32mp151a.pdf ST TFBGA-361, 12.0x12.0mm, 361 Ball, 23x23 Layout, 0.5mm Pitch, S-PVSON-N10, DRC, http://www.ti.com/lit/ds/symlink/tps61201.pdf 3x3mm Body, 0.65mm Pitch, S-PVSON-N8, http://www.ti.com/lit/ds/symlink/opa2333.pdf 3x3mm Body, 0.5mm Pitch, https://ww1.microchip.com/downloads/en/DeviceDoc/16B_WLCSP_CS_C04-06036c.pdf WLCSP-20, 4x5 raster, 1.934x2.434mm package, pitch 0.4mm; see section 7.6 of http://www.st.com/resource/en/datasheet/stm32l072kz.pdf WLCSP-49, 7x7 raster, 3.277x3.109mm package, pitch 0.65mm; see section 7.2 of http://www.st.com/resource/en/datasheet/stm32f429ng.pdf WLCSP-143, 11x13 raster, 4.521x5.547mm package, pitch 0.4mm; see section 6.1 of http://www.st.com/resource/en/datasheet/stm32f103ze.pdf Lattice caBGA-381 footprint for the principle https://www.lookmumnocomputer.com/simplest-oscillator/ for a single 2.5 mm² wires, basic insulation, conductor diameter 1.25mm, outer diameter 1mm, size source Multi-Contact FLEXI-E/HK 0.127 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST EH series connector, BM04B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator JST PH top entry JST VH PBT series connector, 14110613002xxx (https://b2b.harting.com/files/download/PRD/PDF_TS/1411XX13002XXX_100228421DRW035C.pdf), generated with kicad-footprint-generator JST XH series connector, B03B-ZESK-1D, with boss (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 48 Pin (http://www.analog.com/media/en/technical-documentation/data-sheets/LTC7810.pdf), generated with kicad-footprint-generator JST EH series connector, S40B-PUDSS-1 (http://www.jst-mfg.com/product/pdf/eng/ePUD.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through.

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