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BackAnd .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.schmitzbits.de/ms20.html which is what MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up to 1amp
- -1.041733e+02 9.652563e+01 1.055000e+01 facet normal 0.181245 0.229572 0.956267.
- SI570, SI571, Programmable oscillator, Standard SI570.
- -3.453235e-04 vertex -9.976002e+01 1.056904e+02 1.055000e+01 vertex.