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BackQ1, Q2, Q3, Q4, Q5 | 5 | 22k | Resistor | | | Q1, Q2, Q3 | 3 | 2N3904 | 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 R16, R17, R19, R20 **Potentiometer, 9 mm or 16 mm vertical board mount. \*\* Use only four (4) potentiometers, either 9 mm or 16 mm have been tested and there could be other values, ceramic may work, test debouncing. Maybe enlarge footprint if needed. - Resistor footprint could stand to be fixed elsewhere -9.512867e-01 -3.083077e-01 -2.079303e-05 facet.