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Circuit outside 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 https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (https://www.diodes.com/assets/Package-Files/TO92S%20(Type%20B).pdf TO-92S package, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot556-1_po.pdf 24-Lead Plastic QFN (2mm x 2mm), http://ams.com/eng/content/download/950231/2267959/483138 DD Package; 8-Lead Plastic Dual Flat.

File Panels/fireball_vco_14hp_v1.scad Normal file Unescape Hardware/PCB/precadsr_aux_Gerbers/precadsr-F_SilkS.gbr Normal.
10x10, 7x7mm package, pitch.
Connector, 504050-1091 (http://www.molex.com/pdm_docs/sd/5040500891_sd.pdf), generated with kicad-footprint-generator.

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