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Recent content by CoCoMan

  1. CoCoMan

    Scare Box

    Hum- that's quite an amusing project. If I understand it right, you want the motorized device to mechanically activate the switch, and that you want to critter to pop out suddenly, fast, really fast. Are you sure an electric motor will be fast enough? The best guess I have is maybe a small...
  2. CoCoMan

    video CPLD?

    Ah ha! I think we're on the same page now, and I understand you correctly-- A 4 layer board is something somewhat like a "sandwich" wherein the "meat" (the inner layers) are often the ground plane, and the outside layers (top&bottom) are mostly circuit traces. So it actually has 2 sheets of...
  3. CoCoMan

    video CPLD?

    All the blank copper clad laminates like I see here only have two physical sides at the most, top and bottom. Will you show me a blank laminate that has 4 physical layers of copper? http://www.circuitspecialists.com/prod.itml/icOid/8178 Are you refering to a single sided or a double sided...
  4. CoCoMan

    video CPLD?

    You're right-- I can only spin a board down to 5 mils. Any thing less than that is unpracticle and unpredictable, as pin spacing might become a problem. Even though I already have Eagle, and have actually created a device in it using library editor, I find that is a very time comsuming...
  5. CoCoMan

    video CPLD?

    Buying a ready-made kit is not really such a bad idea. I do not need the Gerber files. I have made a circuit board in the past using toner transfer and this homebrew method really does work, believe it or not. So gerber is useless to me if I'm not going to do a PCB send out, but that is...
  6. CoCoMan

    video CPLD?

    Yes, okay, so I get the point- I need to make up my mind about which manufact. I will go with. I'm *assuming* this decision will be based on which chip I plan to buy and use. So let me back up and do a little recap here::: Before I originally posted, I had read all of the following...
  7. CoCoMan

    video CPLD?

    Thanks, that's good info... In my case, it seems better - why buy when the manufacture's is free! Is the manufacture's software the same thing as the Verilog/VHDL software? Does it include that? (if not, where may the language software be obtained)? I'm just trying to get started. I will do...
  8. CoCoMan

    A way of switching a ac signal

    Could a digital potentiometer have an application here? I don't know, I've never used them... but I wonder what they are?
  9. CoCoMan

    Portable motion detection alarm system

    The original poster did not specifically require DC, but it is entirely possible to build the the whole gadget to run on dc current. Obviously, the hard part, and the one that offers the most problems, is the motion detector. Get that part right, you can hook up anything you want. The only dc...
  10. CoCoMan

    Schematics / PCB

    This may sound redundant, but I learned many symbols simply by looking at the diagrams of other circuits. Once you are familiar with the symbols of resistors, capacitors, inductors, diodes, transistors, etc., you are well on your way to speaking the language. Maybe try one of those...
  11. CoCoMan

    video CPLD?

    I am looking at building from scratch a 640 x 480(or at least 240) line video display generator which gets the video data directly out of RAM. I came across this <a href="http://elm-chan.org/works/crtc/report.html">article</a> which mentions something about using a CPLD. BUT I am a complete...
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