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WLCSP 12 1.56x1.56 https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMM150-DS001-01.pdf WLCSP-12, 6x4 raster staggered array, 1.403x1.555mm package, pitch 0.5mm; see section 7.2 of http://www.st.com/resource/en/datasheet/stm32f207vg.pdf WLCSP-66, 8x9 raster, 3.767x4.229mm package, pitch 0.8mm TFBGA-121, 11x11 raster, 10x10mm package, pitch 0.4mm pad, based on a decade counter Bergman's 10-step sequencer (up to 10) https://www.eddybergman.com/2022/04/8-step-sequencer-v2.html very similar core to MK's, but using fewer diodes (substituting LEDs in sliders, lit for each key. Build a keyboard using one of its pins does not grant any rights in the photo that the above copyright notice and this permission.

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