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  1. KrisBlueNZ

    Newbie in great need of help ! ! !

    How do they work?
  2. KrisBlueNZ

    Repair DSi XL power soket problem.

    So some of the connection pads came off the board when you removed the old socket? In that case, install the new socket, and for each of the missing pads, solder a piece of thin insulated wires from the terminal of the new socket to the closest component on the track that used to run to that...
  3. KrisBlueNZ

    Newbie in great need of help ! ! !

    He wants to measure distance, not direction.
  4. KrisBlueNZ

    single polarity voltage supply

    I have moved your thread to the Electronics Homework Help forum.
  5. KrisBlueNZ

    Chrono Sensor Help Please

    I guess I'm missing something, but what does this board do? You said you have a chronograph... a chronograph is something that displays time. How does this board relate to that? How is it used in relation to displaying time?
  6. KrisBlueNZ

    Creating A DC and An AC power Source With Approximately Equal Effective Voltage Outputs

    Okey dokey. BTW the thermistor will have to go in series with the input, not across it.
  7. KrisBlueNZ

    Repair DSi XL power soket problem.

    It looks like you've already removed the old connector and you have a new connector (or at least a picture of one). Clean the board with isopropyl alcohol and cotton swabs. What's the problem?
  8. KrisBlueNZ

    Need Some Help Figuring Out How to Use the PDSP2112

    That all looks OK. The code that deals with -RST could be reduced slightly and commented. After "gosub write_sr ;a do nothing state", you don't need to drive nRST high wait. You just need the three lines that set nRST low, wait, and set nRST back high again. You should include a comment...
  9. KrisBlueNZ

    Need Some Help Figuring Out How to Use the PDSP2112

    Right, exactly.
  10. KrisBlueNZ

    Cordless 1500 Watt Hand-held Blow Hair Dryer

    Great ideas Bob and Hop! I was going to suggest using an engine with very low mass, operating with some kind of variable friction load, to provide the heat directly, as well as spinning the fan. That might be safer than a gas turbine, although probably a lot less impressive.
  11. KrisBlueNZ

    Biasing DC inputs to chips

    Hi there and welcome to Electronics Point :-) Yes, you can tie the SELI pin low or high. The pulldown resistor is mentioned in the data sheet because in some designs, the controlling device (the thing that interrogates the USB Master to determine its current rating, monitors the cell, and...
  12. KrisBlueNZ

    Need Some Help Figuring Out How to Use the PDSP2112

    That's great Dan! Good work :-) If the disturbances only happen on startup, it's probably not a sign of a problem, but if you want to avoid them, you could probably do that by holding -RST (to the PDSP2112s) low initially, until the firmware has started up. If that signal is driven directly...
  13. KrisBlueNZ

    Sony Receiver STR - DA555ES Displays "protection fan" when turned on.

    It has six nice audio amplifier stages which you could reuse. Four channels on the main board and two more on the rear amp board. It looks like they run from ±60V so they'll be able to deliver quite a bit of power! So I would keep the power supply and power amps intact. Much of the rest of it...
  14. KrisBlueNZ

    Newbie in great need of help ! ! !

    I understand your concern about protecting your idea from copying, but based on prior experience, I think it's almost certainly misplaced. From what I've seen, when people with little or no experience in electronics come up with a great new idea, it's the kind of thought that many other people...
  15. KrisBlueNZ

    Sony Receiver STR - DA555ES Displays "protection fan" when turned on.

    The regulator will be overheating because the damaged components on the digital board are drawing too much current. This is normal when a sensitive IC is damaged by overvoltage; it breaks down internally and draws a lot of current. As far as I can tell, the fan is controlled directly by the...
  16. KrisBlueNZ

    Creating A DC and An AC power Source With Approximately Equal Effective Voltage Outputs

    A regulator will turn a "dirty" signal into a much cleaner signal, but it will be damaged if the input voltage goes negative, and it cannot produce output voltage when there's not enough input voltage. A regulator from the 78xx series has a dropout voltage of about 2V. That means that the input...
  17. KrisBlueNZ

    Current limiting strategies for L298N?...

    FYI here's a good application note that describes various types of motor drivers: https://www.silabs.com/Support%20Documents/TechnicalDocs/An191.pdf
  18. KrisBlueNZ

    Newbie in great need of help ! ! !

    Two things? I'm guessing that telling us what kind of "things" you're talking about wouldn't violate any non-disclosure contract or compromise national security? Telling us this simple little piece of information will tell us a lot more - for example, the size of each "thing" so we know...
  19. KrisBlueNZ

    power supply design help

    OK, it's spoon feeding time. Open wide, here comes the train! What about the mains voltage? What is the nominal voltage in India? Is the transformer specified for the same voltage at its primary? What is the allowed voltage variation in India? The dropout voltage of the regulator is not a...
  20. KrisBlueNZ

    Soldering problem

    I have a limited amount of experience here but I have some suggestions. Motherboards are multi-layer boards - six or more layers; two on the outside and four or more in the middle. This means it takes quite a lot of energy to raise the temperature enough for all of the solder to melt and...
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