Search results

Search Forums New Posts
  1. KrisBlueNZ

    200w Bluetooth speaker build

    Hello again! Yes, that sounds like a good idea. Can you link to the 100W amp project and upload some photos of the insides of the Bluetooth speaker.
  2. KrisBlueNZ

    Newbie from SC

    Hi there and welcome to Electronics Point :-) We'll sure try to help you with your pie-in-the-sky ideas!
  3. KrisBlueNZ

    Thermostaticizing

    Please post the diagram of your latest circuit so we're sure what you mean.
  4. KrisBlueNZ

    Logic set up times and hold times

    Right. The device will misbehave because the signals have violated its setup and/or hold time requirements. Sometimes, yes. Sometimes signals can be synchronised with other signals by passing them through a logic element such as a D flip-flop, whose output can only change at defined times...
  5. KrisBlueNZ

    Dumb question re. simple inverter

    Are you still using the basic design from post #1 or are you using the BJT-based design that you sent me in your PM? If the latter, can you repost the schematic and questions from your PM on this thread?
  6. KrisBlueNZ

    Logic set up times and hold times

    We (moderators) agreed to reopen one of "willwatts"'s threads, and he chose this one. So this thread is now open again.
  7. KrisBlueNZ

    Stage Line 500W amp repair project

    Sure. If you get a mismatch though, check the marking on the resistor - the schematic may be slightly different from the board. In any case, post a list of all discrepancies you find.
  8. KrisBlueNZ

    Dumb question re. simple inverter

    If you're using a mains transformer in reverse, you should run it at around 50~60 Hz.
  9. KrisBlueNZ

    Stage Line 500W amp repair project

    Unlikely to damage the new components because we'll be using the resistor fuses.
  10. KrisBlueNZ

    Adding aux input to Sony PMC-202 stereo system

    Yes, it needs to have five contacts. That one is a 6.35 mm (1/4") socket, which is probably bigger than you want. The information on the sales page and the catalogue page is not enough for me to tell for sure whether it will work, but I think it only has four terminals, so it wouldn't work...
  11. KrisBlueNZ

    Need a capacitor!

    I see. In that case, I don't have any suggestions :-(
  12. KrisBlueNZ

    Stage Line 500W amp repair project

    Yes that's what I mean. But it's unlikely that any of them have failed, so it's your call whether you do it or not.
  13. KrisBlueNZ

    Need a capacitor!

    OK, I guess it's non-polar. That's a bit odd because if it's the energy storage capacitor for the flash tube, it would normally only be charged with one polarity. Capacitors for that type of application are not standard - special characteristics are needed - but they're normally polarised. I...
  14. KrisBlueNZ

    power supply

    Converting AC to DC at mains frequency, and regulating with a linear regulator, at 20A output current, are both very inefficient and require some very large and heavy duty components. Your bridge rectifier needs to be rated for an average current of at least 25A. I would use a 35A one such as...
  15. KrisBlueNZ

    power supply

    Hi there and welcome to Electronics Point :-) 50~52V at 20A is 1 kW. That's a lot of power! I think your only option would be a large switching power supply. Your cheapest option might be four 12V, 250W switching supplies with their output voltages cranked up a bit, and their outputs connected...
  16. KrisBlueNZ

    Pioneer H-R100 8 track player

    OK :-(
  17. KrisBlueNZ

    Need a capacitor!

    I was hoping for a few from all angles so we could confirm there are no polarity markings. 200VNP seems pretty clear though. It's just interesting that neither Digi-Key nor Mouser have anything non-polarised in that voltage and capacitance range.
  18. KrisBlueNZ

    I broke distress strobe light with my multimeter when testing amps? (diagram)

    It sounds like you did the right thing making your measurement. It's common to have two cells facing in opposite directions, with the tailcap connecting the positive end of one to the negative end of the other, with contacts at the head end taking the sum of the voltage (3V) to the circuitry...
  19. KrisBlueNZ

    Need a capacitor!

    I don't think that one is non-polarised. Edit: I looked on Digi-Key and Mouser and couldn't find any non-polar electrolytics anywhere near 220 µF and 200V. Could you upload some photos of the old one, showing all of the markings? I just want to confirm that it really is non-polarised.
  20. KrisBlueNZ

    No lead solder needs an 85 watt soldering iron

    User willwatts has started five threads within the past few hours. I am closing all of them temporarily.
Top