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BackArduino + 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 this and/or Hagiwo's quantizer, if going digital ** https://note.com/solder_state/n/nde97a0516f03 and https://www.youtube.com/watch?v=op_DhPr2goc ** arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a gate. Main synth_tools/Schematics/SynthMages.pretty/6.3mm_NPTH_MAXJLCPCB.kicad_mod 24 lines Binary files a/caixa_sr2.png and b/caixa_sr2.png differ Latest commits for file Schematics/SynthMages.pretty/Alpha Rotary 12.kicad_mod // Width of module (mm) - Would not change this if you don't want a large timer-knob style pointer? TimerKnob=0; // [0:No, 1:Yes] ////////////////////////// //Advanced settings ////////////////////////// RingThickness = 5*1; TimerKnobConst = 1.8*1; PI=3.14159265*1; KnobMajorRadius = KnobDiameter/2; KnobMinorRadius = KnobDiameter/2 * (1 - TaperPercentage/100); KnobRadius = KnobMinorRadius + (KnobMajorRadius-KnobMinorRadius)/2; KnobCircumference = PI*KnobDiameter; Knurls = round(KnobCircumference/DistanceBetweenKnurls); Divot=CapType; TaperAngle=asin(KnobHeight / (sqrt(pow(KnobHeight, 2) + pow(KnobMajorRadius-KnobMinorRadius,2)))) - 90; hole_right = hole_left + 78.5; footprint "eurorack_rail_hole" (version 20221018) (generator pcbnew 9f9f6acf76 Add notes about wiring SW15 cross-board facet normal -0.5 -0.866026 -1.49618e-05 facet normal -4.496502e-001 -7.868880e-001 4.226369e-001 vertex -2.491548e+000 -4.438239e+000 2.480400e+001 facet normal -0.137446 -0.257144 0.956549 vertex -7.46035 3.09018 5.88782 facet normal -0.353627 0.43089 0.83023 facet normal -0.0980045 -0.995186 0 vertex -1.76336 2.42705 0 vertex 2.69268 -2.0165 18.1498 facet normal -0.485049 0.124364 0.865599 facet normal -0.39288 -0.56635 0.724495 facet normal -0.84015 0.533181 0.0993242 facet normal.
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