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    Inverting PS_ON?

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    Duet Hardware and wiring
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    • tomasfundefined
      tomasf
      last edited by

      I just discovered the power supply I ordered seems to use a somewhat inverted PS_ON signal. According to the documentation[1], ground apparently turns the power off:

      Power on : "Hi" >2 ~ 5V or (Open circuit)
      Power off : "Low" <0 ~ 0.5V or (Short circuit)

      If I understand this correctly, this is different from how the PS_ON signal on ATX power supplies work. Any ideas on the best way make this work correctly with my Duet board?

      Thanks!

      [1] http://www.produktinfo.conrad.com/datenblaetter/1200000-1299999/001293692-da-01-en-SNT_IP67_600W_24V_25A_CV_CC.pdf

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      • tomasfundefined
        tomasf
        last edited by

        I solved it by using a good old 7400 NAND chip, used as an inverter, with a pull-up resistor on the input. Seems to work nicely.

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