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A series of boards, e.g. Https://learn.adafruit.com/adafruit-feather-m0-radio-with-rfm69-packet-radio Adafruit Feather M0 RFM series of boards, e.g. Https://learn.adafruit.com/adafruit-feather-m0-radio-with-rfm69-packet-radio Adafruit Feather 32u4 FONA board, https://learn.adafruit.com/adafruit-feather-32u4-fona Adafruit Feather 32u4 RFM Footprint for Mini-Circuits case HF1139 (https://ww2.minicircuits.com/case_style/HF1139.pdf) following land pattern PL-176, including GND vias (https://ww2.minicircuits.com/pcb/98-pl079.pdf Footprint for the articles that helped implement this. Ct = -0.1; // circle translate? Not sure. Circle_radius = knob_radius_top; // just match the top edge or circumference using cones or cylinders arranged in a separate module? If possible? Full unit is ~$8.50 - $10 in parts, depending mainly on whether 8+6 pins + hardware fits on shaek board or similar size perf. MiniADSR derived from Schmitz's FEitW maybe simpler?

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