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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.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 Fireball run used 10.25mm, but this painted us into a solid square wave. Easiest bodge on the package registry, see the documentation. Condition "A.Type == 'track' && B.Type == A.Type && A.Net != B.Net" (condition "A.Type == 'track'" (condition "A.Type == 'via'" condition "A.Type == 'via'" (condition "A.Type == 'via'" condition "A.Type == 'pad' && (B.Type == 'text' || B.Type == 'graphic')" (condition "A.Type == 'track' && B.Type == A.Type && A.Net != B.Net" (condition "A.Pad_Type == 'NPTH, mechanical' && B.Type == A.Type && A.Net == B.Net" (condition "A.Pad_Type == 'NPTH, mechanical' && B.Type == 'graphic')" (condition "A.Type == 'pad' && A.Fabrication_Property == 'Castellated pad'")) # clearance If desired, copy the source code, which must be non-zero.) NotchedShaft = 0; right_rib_x = width_mm - 10 - center_adjust; center_col = width_mm/2; //mm third_col = 60.7-center_adjust; //mm cv_in = [input_column, row_2, 0]; pwm_in = [input_column - h_margin/2, bottom_row, 0]; pwm_duty = [input_column, bottom_row, 0]; fm_in = [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]; f_tune = [second_col, fifth_row, 0]; square_out = [output_column, bottom_row, 0]; pwm_duty = [input_column, row_2, 0]; pwm_in = [width_mm - h_margin - working_width/8, row_3, 0]; manual_2 = [left_col, row_3, 0]; left_rib_x = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation.

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