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Rate - variable resist +6k between U2-8 and U2-9 - Reset Sw - when pressed, short +12V and Reset In - U1-13 (can get at from top when assembled Stop Switch - 10 - center_adjust; center_col = width_mm/2; row_1 = vertical_space/7; row_2 = row_1 + v_margin + 12; row_1 = bottom_row + v_margin + 12; row_1 = v_margin+12; // draw a "vertical" wall to mount a 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 the mid surdos.

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