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  1. KrisBlueNZ

    RS232 & Crossing RX/TX Lines

    You need to work it out based on the direction of data flow. A MAX232 contains transmitters, which take a logic-level signal and retransmit it at RS-232 levels, and receivers, which take an RS-232-level signal and convert it to logic levels. Therefore the "output" data from your WiFi module...
  2. KrisBlueNZ

    Need Help in SCR/TRIAC Project

    Ah, I see what you mean. I thought these devices were designed to control larger triacs - at least, the ones with zero crossing circuitry in them are. I guess I assumed that because they're described as optcouplers with triac outputs, not triacs with optocoupler inputs! They're like an MOC3063...
  3. KrisBlueNZ

    Make a DC supply?

    As long as you don't affect their ability to heat up. Anything that's in contact with the body will conduct heat away from the device and stop it from opening when it should (or delay it). Heat shrink on the leads should be OK as long as the leads are at least 5 mm long and the body doesn't...
  4. KrisBlueNZ

    Need Help in SCR/TRIAC Project

    That sounds interesting... can you suggest a part number for me to check out?
  5. KrisBlueNZ

    Chokes

    Jules, I have moved your two newer threads into this one, since they are clearly on the same subject. This keeps all the related discussions together and reduces confusion and duplicated effort.
  6. KrisBlueNZ

    Dumb question re. simple inverter

    No, you have not understood Bob's explanation. The input voltage is first stepped up to about 170V DC using a converter operating around 50~100 kHz, then the 170V DC is used to power a circuit that's effectively just a high-voltage amplifier, just like an audio amplifier, which is supplied with...
  7. KrisBlueNZ

    Make a DC supply?

    Yes, but I wouldn't solder alligator clips to it - it's too easy for them to short together. Better to put a socket (or a row of sockets) on it, and plug the loads into it. What are you going to be powering from it? Breadboards? Make up suitable cables with insulated two-pin connectors that...
  8. KrisBlueNZ

    Hold 5v Line

    Oh, sorry, you have. First, connect the unused inputs of the chip to 0V. Those are pins 13, 11, 9 and 5. Then add a decoupling capacitor - 0.1 µF ceramic with leads as short as possible, as directly as possible between pins 14 and 7. Do you have the blue LED connected between the output and 0V...
  9. KrisBlueNZ

    Hold 5v Line

    Yep, post photos of both sides of the board.
  10. KrisBlueNZ

    Need Help in SCR/TRIAC Project

    If you want to control the firing angle, use an optocoupler WITHOUT zero crossing circuitry inside it. Your optocoupler will also need a high output voltage rating (350V or more) unless you use it to control some other circuitry that actually fires the SCR or triac. Start with a Google image...
  11. KrisBlueNZ

    Need Help in SCR/TRIAC Project

    Yes - optocouplers. There are several types. If you give us more details of the type of control you want (firing angle control? Cycle-by-cycle control? SCR or triac? What type of load? What voltage?) we can make some more specific suggestions.
  12. KrisBlueNZ

    Need help with smd code

    Probably a 4.00 MHz ceramic resonator, or possibly a crystal, with built-in capacitors, to set the clock frequency for the PIC microcontroller directly above it. See http://www.digikey.com/product-search/en?pv139=1454&pv183=752&pv5=136&pv69=3&FV=fff4000d,fff80397&stock=1&quantity=1
  13. KrisBlueNZ

    Tips for learning recursion?

    Sorry, I'm not going to be able to upload a Python version of my Java anagram program. It's quite a bit bigger and more complicated than I thought, and needs quite a lot of effort to convert from Java to Python. One day if I finish doing that, I'll upload it. Sorry :-(
  14. KrisBlueNZ

    Wii U Component identification

    The inductance probably isn't that critical, but the current rating will be. You said the power supply was rated at 5A. Also the physical size and the spacings between the mounting pads have to match. Have a look at this part filter on Digi-Key and see if you can find a physical match. Then go...
  15. KrisBlueNZ

    12v LED Strobe Controller

    If you have a limited number of outputs, e.g. just left and right indicators, then you can generate all of the patterns independently and just use a rotary switch to choose between them. A microcontroller would make things much simpler electrically, but either way will work.
  16. KrisBlueNZ

    Toshiba 32BV701B audio fault

  17. KrisBlueNZ

    Active Bridge Rectifier?

    Sure there is. What does the signal represent? What are you going to use the resulting voltage for? Keep going from there. Do you know what PWM means? If you rectify and smooth a PWM signal you will get a constant output voltage regardless of the duty cycle. PWM needs to be smoothed with an RC...
  18. KrisBlueNZ

    Random LED Colour Changer

    I'd be interested to see your version!
  19. KrisBlueNZ

    Current bypass

    If you can include a resistor in series with the Hall sensor input, I think your best option would be a voltage clamp in parallel with the combined resistor and Hall sensor input. The simplest type of voltage clamp is a diode. The circuit looks like this: The Hall sensor input has a certain...
  20. KrisBlueNZ

    Need help with calculations for a ribbon speaker cable!

    Hi Peter and welcome to Electronics Point :-) I can't answer any of your technical questions, but I have a question for you. How do you know that your impression that "the sound is wonderful" is accurate? My impression is that a length of standard low-cost (but reasonably thick) twin tru-rip...
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