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BackFile uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the front panel. Current design uses six IDC 2×8 connectors with 4 unused pins if supplying power, but not necessary for old fogeys like me to get 1:1 between schematic and PCB, no warnings d62e7c6861 More work finding space for everything, lining things up more c5efc87d8e Make slider and LED footprints match current OpenSCAD model .gitignore | 1 | 4.7 uF | Unpolarized capacitor | | | | | D3, D4, D5, D8, D9, D10 100V 0.15A standard switching diode, DO-35"/>