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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 single output Power Module uPOL MUN12AD01 Power Module uPOL MUN12AD01 Power Module uPOL MUN12AD01 Power Module uPOL MUN12AD03 Meanwell DCDC non-isolated converter SIP module, http://www.meanwell.com/webapp/product/search.aspx?prod=nid30 Isolated 1W or 2W Single Output SM DC/DC Converters 78sr3.3 78sr5 78sr9 78sr12 78srXX DCDC-Converter, RECOM, RECOM_R-78HB-0.5L, SIP-3, Horizontally Mounted, pitch 2.54mm, size 15.7x6.2mm^2, drill diamater 1.2mm, pad diameter 3mm, size source Multi-Contact FLEXI-E 0.1 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3.

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