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De minimis and the PCB. If you use 9 mm vertical board mount OR: | | R14, R15, R18 | 3 | 10k | Resistor | | | R1, R10, R11 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92 | | | | | R3, R21, R27, R28 R4, R6, R7.

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