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BackDAC 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 mid surdos.
- -> 138868 bytes Docs/precadsr_bom.md .
- + half a jack col_right .
- LED, http://www.kingbright.com/attachments/file/psearch/000/00/00/CA56-12SURKWA(Ver.8A).pdf 4 digit 7 segment green LED.