The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

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  • Dell Optiplex GX270 Power Control PCB Connections

    The general idea is to gut an old Dell Optiplex GX270 and stuff the high-voltage parts of the sewing machine controller inside a well constructed and solidly grounded metal shield inside a not-too-ugly plastic box. It’d be nice to reuse the power control button and status LEDs on the front panel…

    The few parts on the front of the through-hole board:

    Dell Power Button PCB - component
    Dell Power Button PCB – component

    The copper side, with annotations:

    Dell Power Button PCB - copper
    Dell Power Button PCB – copper

    The red tracer on the ribbon cable goes to Pin 1, which is a blind key on the PCB.

    The LEDs do not have ballast resistors, so those must go on a circuit board somewhere else.

    The connections:

    16 14 12 10 8 6 4 2
    Gnd nc nc nc nc HD+ HD- Button+
    Gnd nc Gnd Pwr Y+ Gnd Pwr G+ Gnd Key
    15 13 11 9 7 5 3 1