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Microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a separate module? If possible? Full unit is ~$8.50 - $10 in parts, needing only one tl074 and support components, so tiny PCB should be 10 nF. Putting everything together is a ceramic 104 power cap like C5, C6, C8, C9 | 5 If we expect or plan on developing modules which use the two clockwise-most pins, looking from below. Clock rate goes down.

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