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The Normal pin for Pause (J19/J18); the schematic is incorrect Ins: Clock In Normal - 1k to U2-8 (AND NOT short to U2-10 Clock Rate - variable resist +6k between U2-8 and U2-9 Reset Sw - when pressed, short +12V and Reset In socket - Reset Socket to U3-3 = capacitor measurement roughly 15nF (has a resistor footprint between +12V and Reset In - U1-13 (can get at from top when assembled Stop Switch - 10 ohms.

Of http://www.st.com/resource/en/datasheet/stm32f411vc.pdf WLCSP-49, 7x7.
Changjiang, FNR6045S, 6.0x6.0x4.5mm, https://datasheet.lcsc.com/lcsc/1806131217_cjiang-Changjiang-Microelectronics-Tech-FNR5040S3R3NT_C167960.pdf Inductor, Changjiang.
B.Paste" "Notes": "Layer B.Mask" "Notes": "Layer F.Cu.

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