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  1. KrisBlueNZ

    Led circuit

    I would have suggested a PIC or an AVR. But in his first post, the OP said... Thanks. I agree, and I would have used a microcontroller if I was making this myself. But programming is a big step in both senses - "programming" as in learning the architecture and writing the code, and...
  2. KrisBlueNZ

    Mosfet Selection....

    I just found the NTD4906 using the Digi-Key parametric search. I knew I wanted a through-hole part rated for at least a few amps. Then I sorted by price ascending, and went down the RDS(on) column looking for decreasing numbers. Every time I found a number that was less than the lowest number I...
  3. KrisBlueNZ

    Led circuit

    OK, here's a circuit that should do what you want. It's powered from a DC source in the range 5~12V (shown as BT1 in the diagram). It uses three ICs from the CMOS CD4000 series, ten transistors to drive the LEDs, and various capacitors and resistors. The design is based around two CD4015...
  4. KrisBlueNZ

    Assistance connecting electonic kick drum to drum machine

    Also, can you provide the make and model number for both pedals please.
  5. KrisBlueNZ

    Will an AOC - 23.6" LED HD Monitor work with my OLD PC?

    Thanks pebe. TRAPTRAP, I hope you don't have this same card - according to the specifications, it doesn't have a DVI output! You'd better try to find the chipset number for the video card you have. This information might be in the manual or electronic manual; it may be available through Start...
  6. KrisBlueNZ

    Assistance connecting electonic kick drum to drum machine

    Hi there and welcome to Electronics Point :-) That's an interesting problem. I will do some web research and get back to you. Thanks for giving such a clear and detailed description of the problem. It's a welcome change from many of the requests we get. In the meantime it may be helpful for...
  7. KrisBlueNZ

    No Color. Black and White Picture

    And did you check the track for continuity all the way to the flyback transformer?
  8. KrisBlueNZ

    Will an AOC - 23.6" LED HD Monitor work with my OLD PC?

    pebe, do you have any documentation on the video card's capabilities? If he uses DVI, can the card generate 1920x1200 at 60 Hz non-interlaced?
  9. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    Sure, try both ways
  10. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    Steve and I both want to see the current waveform in the transformer primary but we are suggesting different ways of measuring it. In both cases you need to insert a fairly low-value resistor in series with the primary current path and measure the voltage across that resistor. Steve's...
  11. KrisBlueNZ

    LT Spice Assistance...

    Yeah. It doesn't come with much as standard - just the stuff that Linear Technology know you'll need to simulate their products. There's a Yahoo group where files are posted and archived though. If you need a specific part you can often find it there.
  12. KrisBlueNZ

    Led circuit

    Hi there and welcome to Electronics Point :-) You need to specify your requirements more thoroughly. 1. Do the button need to be treated differently from each other? For example, if a button is pressed that has already been pressed, does that press need to be ignored? 2. When a button is...
  13. KrisBlueNZ

    LT Spice Assistance...

    Yeah, that's a real trap for young players. It should be written large on the first help page!
  14. KrisBlueNZ

    Will an AOC - 23.6" LED HD Monitor work with my OLD PC?

    DVI's definitely better.
  15. KrisBlueNZ

    LT Spice Assistance...

    Yeah :) In LTSpice, megohms must be written "meg". Otherwise it assumes you mean milliohms! It doesn't distinguish "m" from "M".
  16. KrisBlueNZ

    Will an AOC - 23.6" LED HD Monitor work with my OLD PC?

    DVI is a much more modern standard than the 15-pin D-sub VGA standard. While VGA does have support for monitor identification, DVI is much more powerful, and uses a standard resolution of 1920x1200 at 60 Hz, which is exactly what you want.
  17. KrisBlueNZ

    Yiynova LCD Monitor Tablet Repair

    That's a good description of the problem, but I doubt anyone here would take a guess based on it :-(
  18. KrisBlueNZ

    Will an AOC - 23.6" LED HD Monitor work with my OLD PC?

    If the PC's output is VGA and the monitor can accept VGA, and the monitor's resolution is 1920x1200, you just need to find out whether the PC can generate video at 1920x1200 through its VGA output, and at a suitable frame rate (typically 60 Hz, non-interlaced). Go to the screen resolution...
  19. KrisBlueNZ

    Faulty Signal Generator

    Dave, this is a homework question. It's not a real fault and it's not a real sig gen. oladey, have you been taught about how frequency stabilisation is achieved in signal generators? Does "crystal oven" ring a bell? I suspect that's what the question may be asking about.
  20. KrisBlueNZ

    Motor speed controller question.

    You can use a 555 to produce a control signal with adjustable duty cycle, and feed this into a transistor or MOSFET. There are many versions of this idea out there: http://www.pcbheaven.com/circuitpages/PWM_Fan_controller_using_a_555/...
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