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BackSPST 2 momentary pushbutton switches 1 rotary switch, 5+ positions - 10 - center_adjust; center_col = width_mm/2; //mm third_col = 60.7-center_adjust; //mm cv_in = [h_margin, row_1, 0]; fm_pot = [input_column + h_margin/2, bottom_row, 0]; pwm_duty = [second_col, third_row, 0]; //Fourth row interface placement pwm_in = [width_mm - h_margin - working_width/8, row_2, 0]; f_tune = [width_mm/2 + h_margin, top_row, 0]; f_tune = [width_mm/2 - h_margin, top_row, 0]; left_rib_x = thickness * 1; h_wall(h=4, l=right_rib_x); // one more 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 footprint. Some options: Bourns PTL series, such as: https://www.mouser.com/ProductDetail/Bourns/PTL30-15O0-105A2?qs=fV9UsjselOEqdQiKFAm%2Fog%3D%3D (A1M, orange LED, 30mm travel, 15mm shaft * https://www.mouser.com/ProductDetail/Bourns/PTL30-15R0-103B1?qs=X8nz4ozed5glbMOCRmYKzw%3D%3D (B10K, red LED, 30mm travel, 15mm shaft ** https://www.mouser.com/ProductDetail/Bourns/PTL30-15R0-103B1?qs=X8nz4ozed5glbMOCRmYKzw%3D%3D (B10K, red LED, 30mm travel, 15mm shaft https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15R0-103B1/3781301 (red B10K) and https://www.digikey.com/en/products/detail/bourns-inc/PTL30-15O0-105A2/7314942 (orange A1M The first two groups should be possible, too * Manual trigger * See manual step button in Unseen Servant Primary source: ## Kassutronics Precision ADSR with mods
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