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Back- 1k to U2-8 (AND NOT short to U2-10 - Clock Rate - variable resist +6k between U2-8 and U2-9 - Reset Socket to U3-3 = capacitor measurement roughly 15nF (has a resistor limiting max drone frequency:
re-re-remove the mysterious extra trace .../Unseen Servant/Unseen Servant.kicad_sch | 1 | B10k | Potentiometer | | J8 | 1 | 1uF | Film capacitor | | | S1 | 1 | SW_Push | Push button switch OFF-(ON CMOS General Purpose Timer, 555 compatible, PDIP-8"/>