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  1. KrisBlueNZ

    Best way to wind flyback core?

    That blocking oscillator circuit relies on the saturation characteristics of the core. (Google blocking oscillator or look it up on Wikipedia for details.) Do you know the saturation characteristics of the cores you have? Do you know what grade of ferrite they are made from? Do you know the AL...
  2. KrisBlueNZ

    DC to DC conventer

    You want to dissipate 2 kW of power? You mean, waste it - turn it into heat?
  3. KrisBlueNZ

    Suitable substitute part

    OK, if you can get the identical part, what's the problem? I thought you were asking for suitable non-identical replacements. In that case, can you post the data sheets of the non-identical replacements you're considering? Otherwise I don't know what you're asking.
  4. KrisBlueNZ

    Suitable substitute part

    What replacements are you considering? Can you link to data sheets for them?
  5. KrisBlueNZ

    Problem faced in generating more i/o's through AVR

    Hi Muhammad and welcome to Electronics Point :-) The usual way to expand digital I/O on a microcontroller is with shift registers. If your device has an SPI peripheral, this is relatively easy. Outputs can be expanded using 74HC595s or 74LVC595s and inputs can be expanded using 74HC165s or...
  6. KrisBlueNZ

    ATX PSU Power Toggle Circuit

    Perfect, Hop. I'm working on a "KrisBlueNZ's recommendation for connected and crossing wires for clear schematics" now. There are quite a few options, but only a few that are unambiguous.
  7. KrisBlueNZ

    new 4 pole 3.5 mm jack plug, old cable

    I don't think so! Do you have one of each? Can you measure them? Edit: Please be SURE before you post "corrections"!
  8. KrisBlueNZ

    General electronic questions

    Great explanation Hop!
  9. KrisBlueNZ

    alba CX540XI/s BOOMBOX BLEW IC CHIP

    Exactly. In your face, cheap Chinese crap manufacturers! Don't let 'em fill up our landfills, I reckon. Have a good try at fixing the damn thing. As rasmussons says, try taking the IC out and see if the rest of it seems to work. This won't be a conclusive test because you can't check the rest...
  10. KrisBlueNZ

    ATX PSU Power Toggle Circuit

    Hi Mark and welcome to Electronics Point :) Your basic idea is good, but there are a few problems with that design. As Hop pointed out, you need to debounce the pushbutton. Mechanical switches and pushbuttons suffer from a problem called contact bounce, which you should Google. (Edit...
  11. KrisBlueNZ

    LM2907 output saturates with i/p signal of 90% duty cycle

    If the duty cycle is really the problem, you could pass the input signal through a T flip-flop to divide the frequency by two and produce a signal with exactly 50% duty cycle. Use half a CD4013 with the D input tied to the -Q output. Google toggle flip flop for details.
  12. KrisBlueNZ

    Need help building a basic digital counting circuit.

    Maveric, don't worry about Colin. He sometimes seagulls threads without reading them properly. We mostly try to ignore him. https://www.electronicspoint.com/threads/questions-on-power-supply.270297/#post-1623967
  13. KrisBlueNZ

    florescent starter circuit collapsing power supply?

    I guess there will be four independent oscillators on the ballast board, one for each tube. Are there four identical circuits, each with its own inductor, jack4192?
  14. KrisBlueNZ

    Need help building a basic digital counting circuit.

    If you want high brightness, it's best to use the single ones, simply because the low-current LED option isn't available on the three-digit displays. Otherwise either one is fine, but the digits have to have all of their pins brought out. Some multiple-digit displays must be driven by...
  15. KrisBlueNZ

    Problem with 5v power supply

    You may have damaged the LED too. 300 mA is probably too much.
  16. KrisBlueNZ

    Problem with 5v power supply

    Brown black black is 10Ω
  17. KrisBlueNZ

    Problem with 5v power supply

    Are you sure the input voltage is 12V? Are you sure the LED's series resistor is 100Ω? Assuming the LED's forward voltage is about 2V the LED current will be about 30 mA. This will cause the regultor to dissipate about 0.2W (if the input voltage really is 12V) which will make it detectably...
  18. KrisBlueNZ

    Chinese Electronics Sales

    Actually that was a rhetorical question.
  19. KrisBlueNZ

    General electronic questions

    Hi Agriias and welcome to Electronics Point :) Amps (current) is a FLOW. When nothing is plugged into a wall socket, no current flows at all. The 15A specification is just a safety limit. It's telling you that you can draw UP TO 15A of current from that socket. If you draw more than that...
  20. KrisBlueNZ

    Problem with 5v power supply

    Try redrawing your circuit: The 0V rail (negative side of input and output voltages) should run horizontally only, all the way along the bottom of the diagram; The regulator should have its input on the left and its output on the right; Positive voltages should be higher up in the diagram than...
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