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  1. 2dye4

    Anybody appalled by the science errors in the movie INTERSTELLAR

    It's a good movie as things go these days. Actually if you didn't notice the science problems you might love the movie. So I expect the lay people to like it as they should. Here is what bothers me. The science problems could have been mostly fixed VERY easily and still make just as...
  2. 2dye4

    small low cost PLC options

    Hi I am looking for a micro PLC with ideally two serial ports and one ethernet port which has language features that support string manipulation. Ideally I would like a 'c' or 'basic' compiled or scripted language as these seem the best for string handling. If the ladder logic has string...
  3. 2dye4

    Comments about age discrimination

    Some comments in PFFs thread brought up age discrimination. It occurs to me that older engineers are going to have to make due working for contract agencies and freelance due to companies not wanting the over 50 crowd. Apart from some high need areas where exceptions will be made is it going...
  4. 2dye4

    Purple Squirrel jobs

    Heard on NPR a story about companies posting jobs with ridiculous requirements that would be impossible to find. The trade name is apparently a "purple squirrel" as in company A is looking for a purple squirrel. The main feature is that the company really doesn't need the person, they are just...
  5. 2dye4

    greenhouse effect radiative transfer

    Most of us were taught that it's the long wave radiation emitted by warmed objects in the greenhouse that is reflected by the glass that causes the heat to be trapped. A number of qualified people appear to reject this interpretation of the heat trapping...
  6. 2dye4

    Supply refereces with resume ??

    Increasingly companies want your references at the first contact with them, like attached to a resume. I don't think it appropriate to supply my references until there is some level of contact with the company. I may not even want the job after all. My point is not to have my reference people...
  7. 2dye4

    More perks less pay ???

    I see plenty of jobs going unfulfilled in the ads and they mostly have one thing in common. High demands and intrusion on personal life. Apparently these "we want to own you" positions are becoming difficult to fill even in these miserable economic conditions. I find this a good sign. I want...
  8. 2dye4

    Contract clause enforcable or not ??

    A clause in an employment contract that is signed some time ago had a statement to this effect. " Any intellectual property devised, documented or reduced to practice while employed with ( company name ) will be assignable to the company" It's not exact but you get the idea. The contract...
  9. 2dye4

    dspic info ??? anywhere ???

    I want to learn to code my own DSP structures into the DSpic processor series. But many companies including MicroChip themselves want to sell you 'software' to create the code. This i do not want nor do i need if i could only get some details on the DSP core. I am hoping to find a shortcut to...
  10. 2dye4

    gfci tripped by variable speed drive

    I have a variable speed drive that operates on 120 VAC single phase in order to drive a three phase motor as an output. However this drive trips GFCI outlets where ever it is plugged in. PWM changes don't help. I am contemplating a common mode filter but this seems hard to find in high power...
  11. 2dye4

    SMPS blowing fuses help!!

    We buy a SMPS at around 500 W capacity. Driven by 120 VAC. Line and Neut both have a 10A 3ag fuse with i^2*t=137 The round trip DC resistance of the input circuit from the line terminals to the AC input to the rectifier is 0.073 ohms. There is a 140 VAC MOV after the fuses. THere is a...
  12. 2dye4

    EMC immunity

    I have designed a card to go into a machine that has a noisy PWM drive near where my card is going to go. Card was designed with this in mind to create as much immunity as possible. The product is costly to set up and test in whole. My problem is that i have been requested to measure the...
  13. 2dye4

    Approval free alternate energy tie ins ??

    Why can't you go to your home improvement store and buy an alt energy system and use it to offset your homes power usage. The utilities don't like it that's why. The main reason cited is line worker safety from back feeding the grid. If that is the only drawback I have the solution. Why cannot...
  14. 2dye4

    Matlab books ???

    I am looking for a good Matlab book. Not one bound with a subject like numerical analysis or signal processing. My ideal book would be a listing of all the functions by category with no more than a two sentence blurb about the purpose. No extra fluff just a guide to point you to the help page...
  15. 2dye4

    Drag vs speed curves available for modern cars

    Due to this gas thing i would like very much to see a curve of the total rolling resistance vs speed for my two cars. Rav4 and Sienna. I originally set out to measure these myself by finding a lone flat stretch of highway on a windless day and run er up to 75 mph and record the coast down. Fit...
  16. 2dye4

    Idle drain power in battery operated devices

    I have several radios and at least one camera that will consume their aa alkaline cells in 6 months with no usage. This seems wasteful bordering on conspiracy. I have designed circuits to operate continuously on aa battery power for this time frame. I can't help but think there are connections...
  17. 2dye4

    Start an economics discussion in eng tips

    I begin to find economics very interesting these days. Not the highly extrapolated academic stuff but the more broad issues that may be attacked with common sense analysis. I have read frequently more thoughtful analysis on this site than can be attained anywhere else. No we are not economists...
  18. 2dye4

    sinewave inverters reactive power handling

    How do designs that transform dc-ac sinewave handle the return energy of a reactive load. I know the basic building block of an inverter is an H bridge with a filter after, using PWM to implement a sine wave wave output. But if you connect a large reactive load the power flow must be...
  19. 2dye4

    pollution self correcting in the long run ??

    Sorry I know the forum title is engineering in the next 5 years but i have noticed a lot of enviromental concern posted here that definately exceeds 5 year timeline so I ask this question. The earth has evolved from interstellar chaos and its components have settled down into their natural high...
  20. 2dye4

    Should engineers price gouge

    After any hurricane in the US the price of lumber immediately goes up even for inventory that was on the shelf before the storm. The price rises can be dramatic 3X or more. The reason of course is the sudden need for repair lumber. This practice is widely supported by the free marketers and the...

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