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  1. KrisBlueNZ

    PIC programming

    I think the best way to learn new things is by doing. Start with a simpler application - flashing an LED is the usual "Hello, World!" program for microcontrollers. Once you get that going, you will have a much clearer understanding, and you'll be ready to move on to something more complicated...
  2. KrisBlueNZ

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

    OK. Those pics are OK. Now the bridge is removed, can you replace the fuse again and check that it doesn't blow. If it does, the problem is either a short I can't see, or those two small brown capacitors near the bridge marked ". C 103". Assuming the fuse doesn't blow, can you power off and...
  3. KrisBlueNZ

    Current limiting strategies for L298N?...

    Well, only if there are other things that you need (or want) to do. Another option would be to use an FPGA for the motor control, or use a micro that has a built-in FPGA component. Perhaps. Could a table-driven system give better performance than the method I described for DPWM? I don't see...
  4. KrisBlueNZ

    Need help finding the right cap

    Those dimensions are in inches? They're pretty rough. I can't imagine why it would be important to find a capacitor that looks the same a the original. But... The closest I can find on Digi-Key are listed in this filter...
  5. KrisBlueNZ

    DC Bus in a Loop Configuration. Problem?

    Well, I would have thought so, but you don't see any sparks, which is why I was not sure.
  6. KrisBlueNZ

    DC Bus in a Loop Configuration. Problem?

    The reason I suggested decoupling capacitors is mainly to keep noise contained locally. Without them, a lot more of the noise current will flow through the bus wiring and cause radiated interference. I would imagine there will be quite a lot of noise because of the movement of the wheels on the...
  7. KrisBlueNZ

    Need help finding the right cap

    The replacement is "right" in that it has the right value and type; it just has a different colour, size and lead length. If you really need a replacement that looks exactly the same, tell us the size of the original (all three dimensions) and we can try to find the closest match.
  8. KrisBlueNZ

    Stage Line 500W amp repair project

    You're using it right. But you said: On the 200 mV range there is only one digit to the right of the decimal point, so it couldn't read 0.07. That's what is confusing me.
  9. KrisBlueNZ

    Design 2 stage amplifier

    Hi there and welcome to Electronics Point :-) You've made a good start by measuring the signal levels from the phone. The assignment hasn't told you the basis for working out the gain, but I would say one reasonable way would be to ensure that the OPA551 won't be damaged (by having too much...
  10. KrisBlueNZ

    Smooth Acceleration circuit

    Someone should have caught this thread earlier. Automotive modifications are a prohibited topic here (and on many other forums) because of the obvious dangers. I'm closing this thread now.
  11. KrisBlueNZ

    Christmas Gift for my 15 year old electronics enthusiast

    Hi there and welcome to Electronics Point :) Electronics covers a wide range of subjects, but I think you've made a good choice, because microcontrollers (like the Arduino) are a very important part of many of them. Also, microcontrollers are really fascinating to learn about, and they're...
  12. KrisBlueNZ

    DC Bus in a Loop Configuration. Problem?

    I can't foresee any problem with running the power rails in a loop like that. You might want to put a low ESR electrolytic across each power supply rail at each connector - that will reduce interference emission from your wiring, since the rapidly changing currents will be kept to the local...
  13. KrisBlueNZ

    Stage Line 500W amp repair project

    That's right. "Measure across" a component means put one probe on each end of it. So the meter was on the 200 mV range and it read 0.07? That's wrong too. On the 200 mV range, the display should have three digits, then a decimal point, then one more digit. So it shouldn't be able to display...
  14. KrisBlueNZ

    Current limiting strategies for L298N?...

    That's pretty impressive! Writing a compiler from scratch is no mean feat. I guess it depends on the design. They're not supposed to be used as current limiters though! Right, that's how DPWM works. The algorithm for DPWM is much simpler and should translate to your requirements I think. This...
  15. KrisBlueNZ

    Fuel tank sender resistance range conversion

    Hi and welcome to Electronics Point :-) I'm jumping in here a bit late I'm afraid. If you're still looking for an answer, can you tell us a bit more about the sender and the PCM input please. Does the 0~90Ω sender have one wire or two? In other words, is the return path through the chassis...
  16. KrisBlueNZ

    Brother MFC-7820N printer/fax/copier- no longer powers up, except LCD backlight

    I've deleted the other thread. This is the right forum. I agree with Gryd3 that there is no obvious damage, just a bit of darkening due to constant heating. Although there could still be a fault there. I think your first step is to measure the voltages on the output connector at top right. Do...
  17. KrisBlueNZ

    ad5422.h do you have it...

    Are you working from an Atmel application note? If so, go back to their site and find the download page for the app note and see if there's a link to download the source files. It's not likely that someone here will know exactly what you want. You need to take the initiative and do the...
  18. KrisBlueNZ

    Modify circuit to add switch and timer

    C1 decouples the "CV" pin to ground. This is recommended, especially when the 555 is used as a monstable, because it's an inherently noisy device and prone to false triggering. The CV pin is the top tap on a three-resistor voltage divider that sets the threshold voltages for the trigger and...
  19. KrisBlueNZ

    Proper Usage of Oscilloscope (40 Marks)

    It's Electronics Point policy to not give straight answers to questions in the homework help section. But the forum software doesn't let me give myself a warning, so I guess I got away with it this time :-)
  20. KrisBlueNZ

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

    Right, the fuse clips are numbered separately in that design! So each fuse has two FH... numbers. The fuse that clips into FH903 and FH953 is F953. Here are the relevant parts of the schematic. Here's the main power transformer. Mains voltage comes on on the right, into the primary winding...
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