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Recent content by hwswboy

  1. H

    How to determine ∫x^xdx ?

    Re: How to determine ....... Don't waste your time,this is an expression that is notorious for not having a closed form solution. This function does not have an elementary integral, just as e^(x^2) and sin(x)/x do not. Yo can stimate it using Riemann sums, Simpsons method or any standard...
  2. H

    Where does the natural logarithm constant "e" come

    Re: Where does the natural logarithm constant "e" e is the unique number with the property that the area of the region bounded by the hyperbola y=1/x , the x-axis, and the vertical lines x = 1 and x = e is 1. In other words: / e | | 1/x dx = 1 =Ln e | / 1 Also but no original definition...
  3. H

    salaries for embedded engineer

    imec belgium salary North SPAIN Engineering&Management 60K-100K Euro/year Top Engineers: 50K-80K Euro/year Skilled engineers 35K-50K Euro/year Average Engineer 25K-35K Euro/year Beginners 20K-25K Euro/year Averages taken from https://www.gaia.es (real, i'm in that area)
  4. H

    Snow sensor , any idea??

    snow sensor road https://www.heatersplus.com/cit-1.htm
  5. H

    What is ground bouncing and and how to eliminate it?

    Re: Ground bouncing A virtual pin is simply a balance point between the pins of a net. It is not a real pin, and may not even be a drilled via when the routing task is complete but is merely a location to hold the place of branching interconnect points. Therefore, you use a virtual pin as a...
  6. H

    Automatic gain control loop (AGC/VGA) design help

    automatic gain control theory Read This paper.
  7. H

    The best technology for space applications: ASIC or FPGA

    Re: ASIC or FPGA for Space? FPGA's are well stablished in mil/space & other HiRel apps, some manufacturers in play but Actel is the most used. http://www.actel.com/products/aero/index.html
  8. H

    Are there other PCB discussion forums_

    Re: Other PCB forums www.pcbstandards.com www.pcblibraries.com
  9. H

    Why 50 ohm is used at tv circuit 75 ohm ?

    Re: why 50 ohm ? Read This.... (page 9)
  10. H

    BGA chip soldering and desoldering

    desolder bga Ufff.. some difficulties even semi high cost systems. We have in the lab a rework system from metcal APR500 **broken link removed** and in some cases we have problems with soldering and we need to send to assembly to do X-ray verification. My experience told me that bga > 130...
  11. H

    What does ppm stand for ?

    Re: What is "ppm" ppm=parts per million
  12. H

    865-868MHz How busy in Europe? Can someone measure?

    Almost here in my area 800-900mhz is very noisy with cordless phones and garage door remote controls.
  13. H

    How to make matching between coil & 50 Ohm transmission

    Re: very important problem Your problem is impedance match, very good cover in plasma area due to mismatch caused for plasma variations. See the attached doc.

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