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  1. KrisBlueNZ

    Programming processor C8051F587

    I found lots of relevant tutorials using Google. http://www.8051projects.net/keil-c-programming-tutorial/ http://electrosome.com/led-blinking-8051-microcontroller-keil-c-tutorial-at89c51/ http://www.ikalogic.com/part-2-c-programming-for-8051-using-keil-ide/ http://www.keil.com/appnotes/list/c51.htm
  2. KrisBlueNZ

    Programming processor C8051F587

    What do you want to do with the microprocessor? What programming languages do you know? Do you have a schematic diagram?
  3. KrisBlueNZ

    wiring this variac?

    It looks like you're supposed to put 115 VAC in on the black terminals (Phase at the top, Neutral at the bottom) and you get 0~250 VAC out of the red terminals (Phase at the top, Neutral at the bottom). Variacs aren't isolated. If you need isolation, use an isolating transformer before the...
  4. KrisBlueNZ

    Need help with analogue question

    OK, here's what I mean by a tidy schematic: I won't bother describing the changes individually because I already did that in post #2. This schematic and the scope traces are done with LTSpice, a free circuit simulation tool you can get from http://www.linear.com. LTSpice doesn't have...
  5. KrisBlueNZ

    555 voltage controlled oscillator question

    If you want a VCO that can generate arbitrary duty cycles, it's probably best to start with one that generates a triangle or sawtooth wave with constant amplitude (and therefore, variable steepness). If pin 6 or 7 of the CD4046 has a suitable signal, you can use that, but I'd be concerned that...
  6. KrisBlueNZ

    555 voltage controlled oscillator question

    Connecting anything to pin 6 or pin 7 would not be recommended by the manufacturer and it might not work properly with a different brand of 4046. But if that doesn't worry you, and your load has a very high input resistance, it may be OK. It's a lot simpler than using an integrator or low-pass...
  7. KrisBlueNZ

    Voyager Space Probe distance counter

    Never mind :-)
  8. KrisBlueNZ

    Voyager Space Probe distance counter

    I suggested something like that in post #5, third paragraph, and the OP answered in post #6, second paragraph.
  9. KrisBlueNZ

    Trying to identify components...

    I think that's the problem - many people like it. So, people who obsess about that sort of thing (font nerds, I guess) associate it with mediocrity. The way I associate those title pages you see in old YouTube videos, that have blue backgrounds and moving text, with Windows Movie Maker.
  10. KrisBlueNZ

    Voyager Space Probe distance counter

    I'd estimate that any digit that's incrementing faster than 20~30 times per second isn't going to be visually distinguishable from a random blur. That would only apply to the rightmost digit, the hundreds of metres digit (first digit right of the decimal point). That could be driven quickly with...
  11. KrisBlueNZ

    Trying to identify components...

    Yep... Although I wouldn't normally trust any document written completely in MS Comic Sans, I have to admit that those components look very much like the second-to-rightmost one in this picture from page 13. Apologies for doubting you, Mr. dude.
  12. KrisBlueNZ

    Voyager Space Probe distance counter

    I think that's the idea... to show that that thing is moving very fast, and to try to convey the magnitude of the distances involved. To show that, even at its huge speed, it has a long way to go. It could well be that the bottom few digits are just a blur, and there may be no point in actually...
  13. KrisBlueNZ

    Trying to identify components...

    Yeah I'm doubtful as well. The wires on them are very thick, and crimped, and I don't see any polarity indication. Where's the evidence that they're diodes?
  14. KrisBlueNZ

    led cube

    The documentation looks the same to me. Of very little use. I'm fairly confident in recommending that you avoid that kit and that company.
  15. KrisBlueNZ

    Hello from Gryd3!

    Welcome Gryd3 :-) I've already "like"d one of your posts!
  16. KrisBlueNZ

    Need help with analogue question

    That circuit is SO hard to read. You have two nodes connected separately to two separate ground symbols! This is just a recipe for confusion. It's also an insult to people who try to read the schematic - you're asking people (many people) to spend their time trying to find their way around the...
  17. KrisBlueNZ

    Voyager Space Probe distance counter

    There's probably no point going for 11 digits instead of 12. If you really only need 11, you could have one digit below the decimal point. For something that's essentially just decorative, I don't think you would want to be setting the time too often. That's why I thought GPS synchronisation...
  18. KrisBlueNZ

    Trying to identify components...

    Likewise, I've never seen those before. My guess would be fuses. Have you measured them for resistance? Are there any markings on them?
  19. KrisBlueNZ

    Recommend a Reliable Online Parts Store?

    I don't know. But I know who does... He's called Google :-)
  20. KrisBlueNZ

    led cube

    I think you would be limited to the patterns that are pre-programmed into it, unless you have an 8051 C compiler. They include a source code module but I don't know whether that's enough. There's no information on changing the patterns. Also, that diagram is not a complete schematic. I get the...
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