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Recent content by x7r

  1. x7r

    Structural engineering responsibility to the public

    Thank you to everyone who provided comments or suggestions. I thought I'd make this (hopefully) last post with a brief update... A third SE took a look at the structure, found at least some of the problems, and retrofit work is being planned for the house.
  2. x7r

    Structural engineering responsibility to the public

    Ron, Thanks. That's a great idea. I actually talked with the local planning office before contacting the Board. They said they had no one qualified to review the drawings and suggested that I bring it to the attention of some other entity with authority. I'm satisfied that I've fulfilled my...
  3. x7r

    Structural engineering responsibility to the public

    Ron, Yes, there are always other good approaches. I proposed a few to the GC so he could look for the one with lowest cost. But it's difficult to find adequate lateral load paths in the final submittal. Only one side of the pop-top has a good shear wall. A perpendicular side is supported on...
  4. x7r

    Structural engineering responsibility to the public

    fegenbush, That's an interesting perspective. Maybe the other engineer knew that wind resistance features were required and he really did remove them because of a lack of ethics. There's a strong profit motive to do that -- the design will take less than half as many hours, so you can...
  5. x7r

    Structural engineering responsibility to the public

    I'm trying to make sense out of this experience... A local GC asked me to do the structural engineering for a residential pop-top addition. The house is located in a 130 mph wind gust area. The GC wanted to eliminate many of the critical first story interior walls (which were probably...
  6. x7r

    LM4128 2.5V reference problem

    Sorry -- I answered a phone call while I was typing the previous answer, and didn't immediately notice my mistake. I should have said that you can use a 5 kohm resistor to a negative supply, or possibly a 1 kohm resistor to ground.
  7. x7r

    LM4128 2.5V reference problem

    Assuming my first answer is correct, I think a solution would be to add a resistor from the output of the LM4128 to a positive supply voltage (+12V, for example). The resistor value would be selected so that it drew roughly 2 mA of current from the regulator. Therefore the resistor value...
  8. x7r

    LM4128 2.5V reference problem

    I've never used this IC, but its datasheet implies that it is designed to work as a voltage source -- but not necessarily a load. So it supplies the intended load current polarity when your measured voltage is negative, but not when your measurement is positive.
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