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  1. KrisBlueNZ

    PS/2 Keyboard Interface

    This is a pretty common requirement - or at least it used to be, before PS/2 keyboards were superseded by USB keyboards. So there is plenty of information out there just waiting for you to search for it. http://www.google.com/search?q=ps2+keyboard+interface
  2. KrisBlueNZ

    Transmit and receive parallel data through radio link

    I've renamed the thread. The original title was not very useful. Is that what you want? If not, can you be more specific?
  3. KrisBlueNZ

    PCB Troubleshooting Help - I/O Board for DDR

    They're working for me now. If you haven't changed anything, I don't know why they didn't work before!
  4. KrisBlueNZ

    can interfacing with arm

    What do the data sheets say?
  5. KrisBlueNZ

    Power source help

    It should be a lot higher than zero ohms. Zero ohms is a short circuit. Anything more than 100 ohms could be normal. Anything less probably indicates a fault.
  6. KrisBlueNZ

    Power source help

    Measure resistance between the positive and negative power inputs to your board, using your multimeter on resistance range. That will show you if there's a short. If there's a short, inspection is probably the quickest way to find it. Find where the positive wire connects to the board, and...
  7. KrisBlueNZ

    PCB Troubleshooting Help - I/O Board for DDR

    Hi Sean and welcome to Electronics Point :-) Your photos are not appearing in your post. If they are appearing when you view the post, perhaps that's because they're on your hard drive. In that case you need to upload them as attachments using the Upload a File button.
  8. KrisBlueNZ

    Help with frequency divider

    I don't know why the letter is doubled up. Maybe because there are multiple drains and sources connected (directly or indirectly) to each rail. I guess the convention started with VCC for transistor circuits. Some old ICs with bipolar supplies called their negative supply pin VEE. You're right...
  9. KrisBlueNZ

    12V - 36V 30mA Converter using LT1173

    Why are you using such low values for the voltage feedback resistors? As Adam said, the power dissipation in R2 will be significant. P = V2 / R = 262 / 820 = 0.82W The wattage rating of the resistor doesn't affect how much power it is forced to dissipate. A 2W resistor in that position still...
  10. KrisBlueNZ

    Power source help

    Hi there and welcome to Electronics Point :-) Yes, that should work, provided you have it wired up right. Yes, set the multimeter to DC volts and put the red probe on the positive terminal and the black probe on the negative terminal. The current ratings aren't a problem as long as your power...
  11. KrisBlueNZ

    common emitter amp design

    I haven't heard of it being called series feedback, but you could well be right. I just call it "emitter degeneration", but that's only a specific case of "series feedback". No, I'm talking about accuracy of the output waveform. The base is driven from the input source, which is a voltage...
  12. KrisBlueNZ

    Chicken Coop Door Opener

    That looks good Dan! C3 is not needed, and I suggest you add a marking on J1 such as "To door controller". What package did you use to draw the diagram? It looks really good.
  13. KrisBlueNZ

    common emitter amp design

    Good answer Adam. But the emitter decoupling capacitor is deliberately left out, because the desired circuit gain is 33 at AC. This also produces lower distortion because the emitter degeneration resistor becomes a source of negative feedback at AC, as well as at DC. Other than that, you've...
  14. KrisBlueNZ

    Help with frequency divider

    Yes, that looks good. I have two suggestions: The 0.1 µF decoupling capacitor must be connected as directly as possible between pins 16 and 8. It's a good idea to show it like that on the schematic, to remind you when you come to build it up. You can use a CD4024 or 74HC4024 instead of a...
  15. KrisBlueNZ

    Boost converter current calculation

    You get the battery free when you buy the truck!
  16. KrisBlueNZ

    Boost converter current calculation

    Of course he does! Why not?
  17. KrisBlueNZ

    what are the GERBER FILES & what should we consider when genarate them

    https://en.wikipedia.org/wiki/Gerber_format
  18. KrisBlueNZ

    common emitter amp design

    You posted this thread in the wrong section. The Off-Topic Members' Lounge is for off-topic subjects, i.e. subjects not directly about electronics. This is an on-topic subject! It also looks like homework so I have moved it to the homework section.
  19. KrisBlueNZ

    Fire Alarm. Faraday mpc 2000.

    Hello Vasya and welcome to Electronics Point. I'll tell you a clever trick to use when you want information. It's called Google. You type www.google.com in your address bar, then in the search field, you type some keywords, such as Faraday MPC 2000. Then you click Search. If you try it, you'll...
  20. KrisBlueNZ

    Help with frequency divider

    Yes, you can build it on a piece of stripboard. See http://nz.mouser.com/ProductDetail/BusBoard-Prototype-Systems/ST1/?qs=sGAEpiMZZMtgbBHFKsFQgo04jOHntgNPn3TJGm1G4JE%3d If you want it as small as possible, you could try using an SMT (surface mount technology) version of the CD4024, or the...
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