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BackHttps://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 circumference surface. // Number of faces on the lower 5 mm LED 5 mm | | | Tayda | A-1624 or A-2969 | | | | Tayda | A-001 | | R30 | 1 | AudioJack2_SwitchT | Audio Jack, 2 x 6mm drills 3 pin Molex header 2.54 mm spacing D 2 pin Molex header 2.54 mm 2x5