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  1. koolkid

    CAD software distinctions

    If price/performance is the foremost criterion, try Adlibre ($495) for mechanical 3D/2D design and Electronic Workbench (<$1K) for electrical (schematic/PCB/simulation) AutoCAD to mechanical drafting is like CPM to Windows, even though I wish there is a good alternative to Win XP. For serious...
  2. koolkid

    Designing a buck-boost converter

    Use the flyback topology, or better still, use the forward topology so you don't have to deal with right-half-plane zero and associated stability. The transformer of those topologies takes care of negative output voltage. Word of caution: switch-mode power supplies are deceptively simple on...
  3. koolkid

    0 ohm resistor

    To serve as an inexpensive jumper or prorammable switch. DIP switches are pretty expensive and bulky and unreliable.
  4. koolkid

    Nut Counter!!! :)

    PC parallel port does have a few bits that can be read in the printer status register. Just take whatever the number of bits you need to count your nuts, which may be defined as a leading edge plus a trailing edge (010. Obviously the case of two or more nuts stick together must be considered.
  5. koolkid

    clean 9.6 volt DC at 5.0 amps from varying 18 to 90 VAC source

    Use a buck converter or even a forward converter. However a good design is not for beginners, as the SMPS will more likely oscilate. It's a tough design given the input voltage range. For a good design house see www.1stquadrant.com/services.htm It normally takes several years to become...
  6. koolkid

    Transformers in parallel: What are the pitfalls?

    jmarko was the closest to a decent solution. In that situation, a difference in output voltage of the transformers will cause one to work very hard while the other only steps in when the output impedance of the first transformer causes sufficient voltage drop as load current increases, to the...
  7. koolkid

    switchmode power supplies

    Switchmode power supplies are not for beginners. It takes many years to reach a level of decent proficiency. Hundreds of PhD chose it as their specialty, and power electronic centers galore at universities. There're thousands of patents on the subject. For inexpensive designs go to...
  8. koolkid

    Pin diode

    A475 is probably the marking on a SMD diode. For spec do a search on ON semi using the package style. Then you can search for A475 to get to the real PN.
  9. koolkid

    Documentation for CE

    Thank you wrjohnst for the links. I also did a search for EN/IEC-61000 standard and found their site, bought and download a standard, and did a SPICE simulation to make sure of EFT conformity. I had to pay 89 Swiss franks but that's a cost of doing business. I'm the company, shuck :). I...
  10. koolkid

    Documentation for CE

    I do want to get spec for CE qualification. Any lead or links are welcome.
  11. koolkid

    Analog Design?

    I also need to get CE spec for electrical equipment. MY power supply design need to pass such as test.
  12. koolkid

    international power systems

    Talking about international power systems, I need to know where I can get CE spec for power systems. I designed a power supply that needs to pass that kind of test.
  13. koolkid

    Analog Design?

    The best to to start a discussion is by asking a question. For RFOWLER re. passive PFC: It's not cost effective over 100W or so, depending on the technique. Contact me hqpower@sonic.net is you want a low cost high efficiency design. I'm surprised to find so many RF experts on this thread. I...
  14. koolkid

    SWITCH MODE POWER SUPPLY

    90 to 270VAC is a usual range for switched-mode power supplies. It's also called universal input, and usually applicable for low cost SMPS up to 100W. For higher power a power factor corrector is often used. For further info please email to hqpower@sonic.net.
  15. koolkid

    Contracting an Engineer

    I'm EE Inventor. See my page www.1stquadrant.com I can help.

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