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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 http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, 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.diodes.com/assets/Datasheets/PAM2306.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py TQFN, 20 Pin (http://www.ti.com/lit/ds/symlink/cc1101.pdf#page=101), generated with kicad-footprint-generator Molex KK-254 Interconnect System, old/engineering part number: 22-27-2091, 9 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Tantalum Capacitor SMD Kemet-X (7343-43 Metric), IPC_7351 nominal, (Body size source: IPC-SM-782 page 72, https://www.pcb-3d.com/wordpress/wp-content/uploads/ipc-sm-782a_amendment_1_and_2.pdf.

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