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  1. KrisBlueNZ

    PPTC (Resettable Fuse) Question

    Yes. But READ THE MANUFACTURER'S DATA SHEET. The extra information in there may be important for your application.
  2. KrisBlueNZ

    Bypass standby switch

    From those photos, it looks like you could slide something (e.g. a piece of cardboard, or a toothpick or a matchstick) in between the bottom of the white plastic stalk from coming down from the piece that you press, and the black plastic actuator on the top of the little tactile pushbutton...
  3. KrisBlueNZ

    SmartBand Project

    Let me rephrase the question: Has any company with less than 10,000 employees ever made anything like that? Do you have any idea of the skillsets and investment dollars needed to bring a smartphone or similar miniaturised device to market? Make sure you get at least one engineer who can tell...
  4. KrisBlueNZ

    SmartBand Project

    OK, that sounds like the sort of thing you could probably make... if your name was Samsung! I know cellphone companies have wristwatch phones with at least some of those features, but has any hobbyist ever made anything like that?
  5. KrisBlueNZ

    PPTC (Resettable Fuse) Question

    Hi Dan. Generally, the hold current is the current below which the fuse is guaranteed to hold indefinitely, and the trip current is the current above which the fuse is guaranteed to open eventually or after a certain maximum time. But there are qualifications such as ambient temperature range...
  6. KrisBlueNZ

    SmartBand Project

    Silly me. I thought it might have something to do with music :-) Feel free to tell us your ideas. We may have useful suggestions.
  7. KrisBlueNZ

    Wot is this?

    Yes, that is a metal oxide varistor, aka varistor or MOV. They are used for overvoltage protection, but they do also have some capacitance. To suppress noise at the LED I would recommend a good quality ceramic capacitor of around 1 µF like this one...
  8. KrisBlueNZ

    SmartBand Project

    Hello and welcome to Electronics Point :-) You could start by telling us what a "smartband" is. Someone here can probably help, but you might be better off looking for forums with other "smartband" people.
  9. KrisBlueNZ

    What size power pack would replace 4 AA batteries?

    Hello and welcome to Electronics Point :-) 1A (one amp) should be plenty. You might get away with 500 mA (1/2 amp) but there wouldn't be much cost difference, so I would go for a 1A adapter.
  10. KrisBlueNZ

    Wireless trigger for LEDs and buzzers

    Yes, that's pretty much what I said: The difference is that when you receive a byte, you're also transmitting txdata; in my example, while I'm reading a response, I just transmit 0x00. I assume that the nRF ignores the data you send to it while it's sending you a response. Yes, any read access...
  11. KrisBlueNZ

    12v 4A power supply

    http://www.google.com/search?q=pc+power+supply+to+bench+power+supply
  12. KrisBlueNZ

    Laser Driver Troubleshooting?

    It's hard to tell from that picture. Can you upload some more? Include an overall picture showing the multimeter and power source as well, and pictures looking at a 45 degree angle from both sides of the breadboard, so we can clearly see where every wire connects, and the part numbers on the...
  13. KrisBlueNZ

    How to read a 5-band resistor that has its bands spread evenly?

    Not all possible values exist, so with many of them, if you read the bands in the wrong direction, you'll get an impossible resistance, i.e. one that doesn't fall into the E24, E48, E96 or E192 series (whichever is appropriate according to the tolerance band). For the example you gave, reading...
  14. KrisBlueNZ

    Bypass standby switch

    I'm not sure what you're asking. I thought you had the problem solved when you said If the toothpick doesn't work, there's probably some other way to hold the button in without opening it up and soldering a link across it. Can you put a loop of elastic around the top of it, with something...
  15. KrisBlueNZ

    Help please

    It might be simpler just to pipe some hot air from the exhaust system!
  16. KrisBlueNZ

    Do a variable AC, high-amp power supply exists?

    Nice... but I think if I could afford one of them, I'd probably buy a house instead :-)
  17. KrisBlueNZ

    PSU Repair - Tevion DVD Recorder

    Yes, pin 7, VDD, connected to C4 (or whatever number it has on your board). Power up the board and check for ~340VDC on pin 5 (drain of internal MOSFET) relative to pin 3 or 4. If that voltage is not present, there's a fault around the transformer primary. Measure voltage on pin 7. If it's...
  18. KrisBlueNZ

    Laser Driver Troubleshooting?

    That's a good choice of circuit. I think you may be measuring it wrong. Set your multimeter to its DC current range, move the probe plug to the current input connector on the multimeter, and connect the probes across the connections for the laser diode. You should get a reading. For 40 mA...
  19. KrisBlueNZ

    supplying AMC7135 with 12v

    I agree with BobK. You should connect them all in series and use a boost converter with output current regulation. This device looks perfect: http://www.linear.com/product/LT3795 because it's very robust, but it comes in a 28-pin TSSOP so you would have to make a PCB for it. You might prefer to...
  20. KrisBlueNZ

    Wireless trigger for LEDs and buzzers

    OK, good. The point is that you can use that function to either read, write, or read and write simultaneously. To read a byte: newdata = spi_txrx_byte(0); // write 0x00 and read the simultaneous response To write a byte: spi_txrx_byte(byte_to_write); // write data; ignore simultaneous response...
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