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Recent content by RomanM

  1. RomanM

    Free PCB software

    Eagle is different but it's not so bad when you get used to it. It is the only package that I found that I could build a board with on the free demo version. The only restriction is the board size, 4" x 3.2".
  2. RomanM

    Electrical Noise in an Automotive Environment

    I just got this from one of the other posts. It is what I was looking for: http://www.schaffner.com/index.asp?menu=emclib&pagemenu=homepage&scopy=wallchart
  3. RomanM

    Automotive Electrical Specifications?

    Thank You eduardom. http://www.schaffner.com/index.asp?menu=emclib&pagemenu=homepage&scopy=wallchart Is what I was looking for.
  4. RomanM

    Electrical Noise in an Automotive Environment

    Thanks for the information. I have some posts in the electrical engineering forum and some responses were saying that I have to worry about +/-150V but they didn't say for how long. Some responses were saying that I have to worry about 1500V. Thats a tough spike. Roman
  5. RomanM

    microcontrollers in the classroom

    What about the PIC 16f877 or 16f873 (www.microchip.com)? These are very durable, low cost, free assembler/development software, flash ROM with thousands of read writes, ISP, UART, A/D, I2C, 3 Timers, 20+ i/o's(capable of driving LED's), PWM... you can get a programmer for $110 at...
  6. RomanM

    Automotive Electrical Specifications?

    Hello, I want to build something that passes the major automotive electrical specifications but I don't know much about automotive electrical specifications. I have to find out what they are so I can discuss them in a presentation. Currently I am very ignorant in this area. This is not for a...
  7. RomanM

    Transient voltage in an automotive environment??

    Thanks for the help so far, How long are these +/-300V spikes? nanosec? 10 usec? 10ms?
  8. RomanM

    Inductor selection criteria

    Try following this link, it is to an app note on Linear Technology's site. http://www.linear.com/pub/document.html?pub_type=app&document=90 They specialize in switching regulators and I've found this particular app note #19 as especialy helpful. Good example on page 4 Good Luck
  9. RomanM

    Transient voltage in an automotive environment??

    I am considering developing some products for the automotive industry and I need to know what kind of transient voltage spikes I have to allow for. What guidelines are there to follow or better yet, some 'rule of thumb' guidelines. I already know that the voltage is generally about 13.8 volts...
  10. RomanM

    Electrical Noise in an Automotive Environment

    I am considering developing some products for the automotive industry and I need to know what kind of transient voltage spikes I have to allow for. What guidelines are there to follow or better yet, some 'rule of thumb' guidelines. I already know that the voltage is generally about 13.8 volts...
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