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1.5mm bare copper, 1.5mm soldermask opening (Level A Circular Fiducial, 1mm bare copper, 2mm soldermask opening Circular Fiducial, 1mm bare copper, 1mm soldermask opening (Level C Circular Fiducial, 0.5mm bare copper, 2.25mm soldermask opening Circular Fiducial, 1mm bare copper, 1.5mm soldermask opening (Level C Circular Fiducial, 0.5mm bare copper, 2.25mm soldermask opening (recommended 5-pin SAW filter package based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another fairly simple one, using Arduino (nano or uno) .

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