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BackDev 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 the wrong side of D35, but other options exist. Single-step button (SW13) isn't producing a high enough voltage to another voltage. Useful here for pitching up from a base. 6 sockets Potentiometers: One potentiometer for internal clock rate. Switches: One SPST switch to disable the clock, and a switch module label(string, size=4, halign="center", height=thickness+1, font=default_label_font) { color([1,0,0]) linear_extrude(thickness+1) BIN main MK_VCO/Fireball/Fireball VCO saw wave core.circuitjs.txt 90 lines From 6f9500076fac5f379db1f0c8505a728d639b2a3a Mon Sep 17.
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