Search results

  1. B

    Basic transistor switch

    Most Arduino, if not all, have this aspect ......input default. According to below, same for pic on reset...
  2. B

    LED Power supply Amp variation

    Suggest something along these lines...............video may be for high power LEDs but should also apply for your arrangement. Cheap enough too.
  3. B

    USB power cable with 35 second delay

    Plenty of delay timers on Ebay etc. with on or off delay from a few milliseconds up to hours and days, all selectable via a small LCD display and up down buttons. Cheap-as, connot build for the price. Select one with a 5V control so it can be powered via the USB.
  4. B

    It starts with an idea.

    How are you with microcontrollers and design work, especially multiple requirements. If no experience with the above, suggest you start study now and you might get there with your idea in 12-18 months or so. When attempting the above, break the total down to individual requirements, then when...
  5. B

    Inductor Question

    Good luck.
  6. B

    Inductor Question

    Magnetic drive, common in small water pumps.
  7. B

    Lowering AC Motor RPM's

    The only AC motors of this small size (I Imagine small as no details on the motors given) that can be speed controlled are series type motors. i.e. brush type however, your required low end speed of 3 to 10 rpm would not be possible. One normally uses phase control via thyristors which may lower...
  8. B

    Inductor Question

    Without any circuit information, which I imagine would be non-existent, it is a rather big ask short of "reverse engineering" the whole shebang. I for one, wouldn't bother given life is short and replacement most likely available at less cost than any parts/labour.
  9. B

    VFD not reaching 50 Hz

    Doesn't seem like much pressure ( around 2 lb sq inch) ....likely to get fluctuations around such a small pressure.
  10. B

    VFD not reaching 50 Hz

    mmm....me too. Why use a vfd , especially on a pump where you need constant pressure apparently at full supply as you wrote. What size motor..?
  11. B

    Artificial Intelligence

    Don't think anywhere in the near future there would be any problems like say in "I Robot" but.... One can see problems currently where equipment is controlled via uC programs and there is no way to intervene/repair other than check/cut power or i/o's. Saw an interview 2 nights ago where a rather...
  12. B

    Help identifying a transistor

    Believe it might be the park cam....
  13. B

    Help identifying a transistor

    Mostly, testing is done with the device out of circuit otherwise one can get misleading results. You don't say what the fault actually is either. For further diagnosis, suggest a full photo of each side of the board.
  14. B

    Parking sensor circuit board

    It's a wheelchair so can't be much more than 1 metre.
  15. B

    Parking sensor circuit board

    It's already off as far as I can make out. Possibly, by disconnecting the current buzzer feed and re-directing from the red LED only. Some circuit knowledge would be required. Difficult to know for sure with the board in your hands ( not here). The main ic is likely to be some type of...
  16. B

    standby switch karaoke player

    Show us your circuit diagram of the machine in question.
  17. B

    Need help troubleshooting pcb relay

    Yes you should.......that's what "across the coil" means. (as Minder explained) Picking a return from who-knows-where will simply confuse matters.
  18. B

    Sensing 230v across motor with Shelly i4 failing

    Is the installation in an MEN arrangement...? Sounds like you might have feedback voltage from the neutral line. Some electronic "gadgets" can be susceptible to such voltage. As a test, I'd tend to run a relay across the motor and then feed your"magic box" with a set of dead relay contacts...
  19. B

    DC voltage reduction circuit needed

    Need more detail as requested above, however, many around, do a Google as they say. First one up, admittedly "hobby project" stuff but there are many others, this is just an example. https://www.aliexpress.com/item/32964001279.html
  20. B

    Nail electromagnet to repel button magnet.

    There is a certain brand of mains electrical safety switch which uses the same principle and it works very well. Idea behind this particular application is, a trip mechanism is held using the small rare earth magnet so obviouslt it is held firmly. When the coil is energised, it opposes the...
Top