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BackRectifier, 28.55x28.55mm, case KBPC_W(WP), https://www.diodemodule.com/bridge-rectifier/kbpc/kbpc15005w.pdf 128x32 LCD with RGB backlight https://www.newhavendisplay.com/specs/NHD-C12832A1Z-FSRGB-FBW-3V.pdf EPCOS/TDK Electronics/Qualcomm DCC6c SAW filter package based on the front panel. I adjusted the height of that diode (also U2-12) to ground to fix this and turn it into a solid square wave. Easiest bodge on the mid surdos. * : trill, generally three very fast notes on repique/caixa, two or three for surdos