Recent content by benjaminc

Thanks for the suggestions - I'll look into those options. It's possible that we could use the 50/60Hz option before the power supply; it'll just require more investigation/characterization of the power supply's characteristics.

Hi folks. Here’s the problem: I’m working on simplifying the manufacture of some geophysical equipment which involves running an AC signal (typically around 300-500 Hz) through the ground. We typically see around 1A of current in the ground at voltages up to 300V. The circuit is composed of a...

Thanks to both of you for the clear feedback. That adds some reasoning to my intuition. Sounds like nothing is ever quite simple when dealing with the analog side -- my experience with digital logic tends to lead me to oversimplify analog design. Appreciatively, Benjamin

Hello, I've got two low-level audio-frequency analog signals -- we'll call them A and B. I'm designing a circuit to give me an output of either A, B, or A+B, with the simple logic being handled by two multiplexers and summing by an op amp inverting summing amplifier (e.g...

I should note that the picture attached above is the preview of the attempted protrusion, but it fails if I try to proceed with creation.

I've run into a problem in Pro/E Wildfire 4.0 that I can't seem to figure out. I'm making an assembly involving a shell part and then a head part which was modeled (top-down) from the assembly based on the shell outline. After putting in extensive work on the complex head part, I added a few...

Thanks, srjchemist -- interesting technology I was not aware of.

I had noticed the various part version files, but didn't realize Pro/E had a method of directly deleting them. Thanks for the tip.

Thanks, Jeff. Agreed on the file management being a bit complex. User interface and the underlying mechanics have already sprung all sorts of little surprises relative to my SolidWorks training -- but I've also appreciated how the program really supports (and virtually enforces) well-defined...

I'm fairly new to Pro/E (SolidWorks user) and am having a repeating problem with the error listed in the subject line: "an object with that name already exists". Basically, I'll create a part, add it to the assembly, then decide I want to completely redesign the part, so I delete it from the...

IRstuff, From my previous post: "Our current version of the instrument has a white PVC shell, and has not experienced any problems with overheating in hot, sunny areas." I should clarify that the interior of the new version is essentially identical with respect to temperature sensitivity, and...

If you'd honestly like to stay with the company and take on some more interesting work (and in this economy, staying with the company may not be a bad idea), it seems to me that your best bet would be to aggressively pursue that possibility. As suggested above, try to talk to your manager and...

Mu, Perhaps you should separate this into two questions: timing and degree. As for timing, it does sound like you have a lot going on right now. That said, it doesn't get any easier to add degrees later on -- though it is possible a future employer will provide even more financial support. As...

Many thanks for the input - especially the Phoenix insight. Having not lived in such a climate, it is indeed difficult for me to grasp just what the sun can do. I guess the operative follow-up question is how much difference a coat or two of white (or silver metallic) paint would make. Our...

I'm designing a portable geophysical instrument to be enclosed in a carbon fiber shell. This shell will have a cross-sectional shape and area similar to a 5" square, with a 1/8" wall, a 2' length, and will be closed on both ends. As the instrument will be used in hot desert conditions, and is...