Search results

  1. P

    The Periodic Egg Cooker

    Hi :) A group of Italian engineers has performed an engineering study on the cooking of eggs, and concluded that the very best way to cook eggs is to alternately boil and cool the eggs on a 2 minute cycle for 30 minutes. Yeah right, eh. Still, their claims have been taken seriously. I think...
  2. P

    Speaker output ohmage without information.

    :) If both impedances were 8 Ohms I can't see that there'd be trouble - it's not as if uncontrolled currents could develop?
  3. P

    A Simple Reliable Topology to Demodulate an AM DSB-SC Signal

    Wow No SSB at our school... no modulation at all. (Sniff) Quite buhulious, in hindsight.
  4. P

    Speaker output ohmage without information.

    Thanks :)
  5. P

    Speaker output ohmage without information.

    Is that a maximum power transfer sweet spot?
  6. P

    What tool do I need?

    I'm no chemist, and this forum does electronics. I have no general remarks to make about hydrochloric acid's suitability for anything other than what I already said, except that it is dangerous and should be treated with respect. Understanding the potential hazards of things you don't...
  7. P

    What tool do I need?

    OK, you're Grandma and here are the eggs. (I'm sorry Grandma this is a compulsion.) Make sure everything is clean. In metalwork when I was 11 we were taught to use a drop of hydrochloric acid to clean dirty terminals - you're an adult so be sure to use the acid safely. Clean the soldering iron...
  8. P

    What tool do I need?

    Yes I would have suggested a 50W or 100W iron. E-bikes are outdoors equipment and the wiring is heavy, so a little 30W circuit board iron is likely to be too weak to be able to heat the joint quickly enough... it might not even melt the solder before something ugly happens. Big, meaty, hot...
  9. P

    What tool do I need?

    :} With electronics, you usually only want to heat the solder joint and not the whole component. (Lots of components fail permanently if they get overheated.) So a hot air gun isn't usually a good choice. As for what tool you really need, it all depends, as Martaine2005 suggests. How about post...
  10. P

    depricated=antiquated=aging=old

    Hi Try CASA Modular Systems, Petone, New Zealand
  11. P

    Speaker output ohmage without information.

    When a manufacturer specifies a loudspeaker impedance, what they're really doing is making sure you dont put too big a load on the amp. An amplifier made to supply an 8 Ohm speaker won't be happy supplying a 4 Ohm speaker, because twice as much current will be taken by the load - and that often...
  12. P

    Speaker output ohmage without information.

    Wow Just suck and see :) 1) Connect a signal and a speaker. 2) Start the volume at zero. Turn volume up gradually. If speaker and amp survive, you won. :)
  13. P

    What kind of switch is this?

    Hi Honeywell is a good brand for that kind of switch. :) Mm I wonder... Do you know how to test your switch, to see whether it is NC or NO?
  14. P

    Speed controller on washing machine motor

    I hope so? Hard to tell, from a picture. Most manufacturers seem to provide good supplies for their own motors (the price might make you cry a little) ~M PS: I see you've already bought your gear, so please let us know how you get on!
  15. P

    Help identifying components in old board

    I noticed the BERYLLIUM. It's dangerous stuff - get knowledgeable on it!
  16. P

    Speed controller on washing machine motor

    Hi I'm thinking that's a split phase motor, whose speed is governed by the frequency of the mains. Sadly, even generating a mains voltage at another frequency won't be satisfactory, because many parts of the motor have been optimised for 60Hz (or 50 Hz) working. You mightn't think it would make...
  17. P

    Comedy Thread

    Gritty stuff, Kiwi! I guess you're one of the ones who rides the Ngauranga Gorge road on a longboard?
  18. P

    110v AC pulse on/off device

    Hi the trouble for me in finding a solution for you is that the voltage that you're working with really needs handled by a professional. There are opto-coupled triacs in the world, sure, and there are 555 timer IC's too, but wiring that sort of stuff up is a bit hazardous.
  19. P

    can the leds be mounted into spray foam insulation

    Hi :) It's good that you checked it all out but your anxiety can settle. What you're doing is safe. The comment about heatsinks (to keep the leds cool and make them last longer) don't really apply to this project since you probably won't live more than another few hundred years anyway and you're...
  20. P

    Is this a better idea for my Variable Bench Power supply?

    :) ...and the design lifetime for consumer products was once 2 years, but even that was in the olden days.
Top