Recent content by Sandman101

  1. Sandman101

    DIO Protection

    Ante, My setup requires the protection to be "resetable" .. as in not a fuse blown but just protection that won't stop the system from running. Also, is this setup applicable to a DIO line? The circuit shown is for a power supply... (my thanks to everyone who has been replying!!)
  2. Sandman101

    DIO Protection

    Would an MOV protect the line if the +28V was applied in a long-term sense, as in, indefinite protection? I'm not looking for spike protection, but a user mistakingly setting the pin to 28V without good monitoring (ie, it's left on long-term). Is an MOV going to cut it?
  3. Sandman101

    DIO Protection

    By resistor and zener you mean: DIO ---/\/\/--------- DIO OUT | ---- / \ | | GND I choose a zener with zener voltage equal to the DIO voltage level .. but what about the...
  4. Sandman101

    Simple Circuit Concept

    Hey all, It's been a long time since I've done discrete electronics and I'm in need of a discrete solution (with logic gates): I have a switch, that once opened, a circuit is "turned on" and runs. If the switch closes, it cannot affect the system. Sorta like an alarm .. when you break in...
  5. Sandman101

    DIO Protection

    Greetings, I have a design question at hand: I have a group of DIO lines, attached to an FPGA, running +3.3V signal levels. Obviously I would like to drive the signals with buffers, which is simple enough. The problem is the outside world of this device has the probability of pulling the DIO...
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