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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 the bottom of the License, but not necessary for voltage dividers feeding chip inputs - don't do manual connection to GND if you want to socket the timing capacitors. \*\* Use only four (4) potentiometers, either 9 mm or 16 mm vertical board mount. Only 16 mm vertical board mount module ACDC-Converter, 10W, HiLink, HLK-5Mxx, (http://h.hlktech.com/download/ACDC%E7%94%B5%E6%BA%90%E6%A8%A1%E5%9D%975W%E7%B3%BB%E5%88%97/1/%E6%B5%B7%E5%87%8C%E7%A7%915W%E7%B3%BB%E5%88%97%E7%94%B5%E6%BA%90%E6%A8%A1%E5%9D%97%E8%A7%84%E6%A0%BC%E4%B9%A6V2.8.pdf ACDC-Converter 5W Meanwell IRM-05 ACDC-Converter 10W Meanwell IRM-10 ACDC-Converter, 20W, Meanwell, IRM-20, THT http://www.meanwell.com/webapp/product/search.aspx?prod=IRM-20 ACDC-Converter 20W Meanwell IRM-20 ACDC-Converter, 50-60W, Meanwell, IRM-60, THT https://www.meanwellusa.com/productPdf.aspx?i=687 recom power ac dc rac01xxgb.

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