Search results

Search Forums New Posts
  1. kellys_eye

    Relay to turn off power instead of on.

    The relay can turn things off as well as on when powered - it depends on the contacts you use. If you get a SPST (single pole, single throw) relay it has a common connection (c), a normally-open (n.o) set and a normally-closed (n.c) set of contacts. Connect +12V to the common connection and...
  2. kellys_eye

    Broken server RAM gold plating

    "...spark when being replaced" :eek: Seriously? You're replacing them with POWER APPLIED????? Either way, the receptacle for such RAM devices is practically zero-insertion (ok, a wiping contact but generally inserted at an angle then clipped upright into the holding arms) so I can only assume...
  3. kellys_eye

    Surface Mount Part Identification - TC

    Since TC1 and TC2 are similarly notified - and they are both capacitors of 10μF - it follows that TC4 will be the same - a capacitor, the value of which is indeterminable but would likely be the same at the others. If this is the case the you need to be aware that they are polarised and that...
  4. kellys_eye

    Component Confusion

    It's called a 'solenoid'. A large(ish) coil of wire around a hollow core that has a plunger that is drawn in as power is appled.
  5. kellys_eye

    Issue in running BLDC motor with microcontroller

    That's for you to implement - basically a loop that decrements a time interval over whatever the motor start up period/requirements are (see the motor data sheet).
  6. kellys_eye

    Inverter power, the voltage becomes low

    Without the details as requested above it is difficult to pass on the knowledge required to fix such a problem. You should know - at least - the input and output voltage ratings. Is there any labelling anywhere on the unit? If not then why on earth did you purchase a unit with no details...
  7. kellys_eye

    Issue in running BLDC motor with microcontroller

    Vary the control pulse such that the first few (start-up) cycles are longer than the 'free-running' cycles.
  8. kellys_eye

    Need Help with a motor control

    Your description of the circuit operation is a bit vague, (not helped by the lack of punctuation making the current description difficult to understand) and our advice is given based on the detailing of the question... however what I think you're asking is as follows: Use a 3 second...
  9. kellys_eye

    Pool shooting robot needs help with rail-gun pool-cue thruster

    It's an interesting project. Whilst I've seen end result videos of such pool playing machines I've never followed the concept from start to finish so if you're prepared to do so, could you keep the thread updated on progress? Good luck with it, whatever you decide <thumbs up icon that doesn't...
  10. kellys_eye

    Trying to re-purpose high voltage power supply. Need help

    If all you want is a high current 12V supply then salvage an old PC power unit. Using that transformer will require significant linear regulation that would make the result both cumbersome and hot - unless you used the DC to feed a buck converter rated to the current demand you have. Those...
  11. kellys_eye

    Video camera pin connector

    Sorry - I have no idea and suspect it may be difficult to source. One solution is to solder the wires directly to the board and take a short length out to another, more commercially-common, connector set.
  12. kellys_eye

    Trying to re-purpose high voltage power supply. Need help

    Use the 27-0-27 taps to create a variable DC supply with + and - rails. Don't bother with the rest of the tappings. Unless you're after a particular volt span????
  13. kellys_eye

    Which wires would be the mic, and which would be the speakers?

    In a word - no. At least, not with that photo! Lets see the other side of the board as well and the ends of the wires....
  14. kellys_eye

    Hello from sunny Hastings

    'Sunny' <grumps> - you're the lucky so-and-so's living 'doon sooth'. Have some sympathy for us West Coast whingers who seem to sit in perpetual mist, rain and midges! Nice to meet you!
  15. kellys_eye

    PCs blowing up

    'Normal' PC's don't require water-cooling! Overclock one and you're heading in the right direction to be needing such cooling. Do you know WHAT blew up on the PC's?? It would be unusual for any surge to get past the PSU given the amount of filtering they have these days. I'd suspect an MOV...
  16. kellys_eye

    Trying to re-purpose high voltage power supply. Need help

    It's a pretty simple bunch of unregulated DC supplies - you can measure the outputs if the circuit can be powered (CAREFULLY - there are potentially fatal voltages in there!) If the circuit is just 'theoretical' you could still fabricate one. A dedicated transformer with multiple windings or...
  17. kellys_eye

    4th July

    We don't 'do' 4th of July but are happy to acknowledge the American way....;)
  18. kellys_eye

    Anyone know what this is?

    Yup - the 1.8V reading may be correct then. Still a diode.
  19. kellys_eye

    Electronic Component Help

    In which case buffer the drive signal to the PMOS via an inverter - BJT or FET.... even a logic gate.
  20. kellys_eye

    PCs blowing up

    In most countries, putting the mains supply across an electric fence would be illegal - quite probably fatal to anyone touching it. But it is unlikely to be the cause of PC failure. The PC you're referring to seems to be tweaked to maximum potential - running on the ragged edge of potential...
Top