Search results

Search Forums New Posts
  1. (*steve*)

    Hello and Help with ID of a 16pin IC

    Yeah, I looked at the photo just after the thread was posted and I had a bad feeling about it. Keep your fingers crossed that you can get a replacement board. edit: sometimes you have to look for scrapped units to scavenge parts from.
  2. (*steve*)

    Ways To Turn Knob With Stepper Motor Using Arduino

    It may be easier to look at a completely different approach. Perhaps a spring loaded flap that prevents the cereal from escaping, and a solenoid or similar which pulls it open. The problem with dispensers like this is that there is always the chance of a piece of cereal jamming the mechanism...
  3. (*steve*)

    How to control the field current of an alternator by using PWM?

    I'm pretty sure this is another one of those threads which starts with: How do I suck eggs And where, given that no other information is offered, the only response that is not a plea for more information is: You apply suction to an egg Further discussion reveals that the person asking the...
  4. (*steve*)

    Vacuum in a Can

    The problem with vacuum in a can is that all I've ever been able to get is the diluted vacuum. I want a concentrated vacuum so that (say) 100mL of concentrated vacuum can evacuate a couple of cubic metres. Hmmm... if that was positive pressure, that would make it 20,000 bar (approx). That's 2...
  5. (*steve*)

    How to control the field current of an alternator by using PWM?

    Well, rather than supplying DC, you supply a PWM signal. Obviously you will need to monitor the current if the absolute value is important, and provide a current path for when the signal is off. As a guess you'd probably want to operate the field coil in continuous mode.
  6. (*steve*)

    How to control the field current of an alternator by using PWM?

    You vary the pulse width (or more strictly the mark/space ratio) to vary the average current.
  7. (*steve*)

    Ardiuno voltages - Beginner

    Other than is really hard to get a 7*AA cell holder, 7 cells would be near perfect. I guess you could make a dummy battery to fill the 8th slot... But then the batteries tend to come in 2's, 4's, 8's, etc., so you'd always have one battery left over.
  8. (*steve*)

    Back diode

    I'll go with Dave's answer. If Constantine's correct in feeling that Minder has it right then I'll go even more with Dave's answer. It sounds to me like you have correctly interpreted something between "nothing" and "nothing important". I don't know if it's the power of the moon or what, but...
  9. (*steve*)

    Ardiuno voltages - Beginner

    From the Arduino web site: One final note. The Arduino's on-board regulator can actually handle up to 20V or more, so you can actually use an adapter that puts out 20V DC. The reasons you don't want to do that are twofold: you'll lose most of that voltage in heat, which is terribly inefficient...
  10. (*steve*)

    Best way to reducing voltage

    Yes. That's typically the voltage you charge them to. I can't see that a voltage divider will work,. It will just draw power until the battery is flat. However, since we don't know what you're doing, we really can't be certain. Can't you throw us a bone?
  11. (*steve*)

    Finding a good soldering iron....

    Maybe I should send you some of the kester I'm using :-)
  12. (*steve*)

    Best method for desoldering (double-sided PCBs)

    Place extra solder on the joint and use a solder sucker or vacuum pump. Solder wick is very effective if the holes ARE NOT plated through, but it can be less so where they are plated. But extra solder will often be the difference between working first time and continued frustration. Edit...
  13. (*steve*)

    Technical question on Floppy Disk circuits

    The FDC probably looks at the data rate coming from the head to determine what sort of disk it is.
  14. (*steve*)

    Finding a good soldering iron....

    High. It really does make a significant difference.
  15. (*steve*)

    Transformer - Number of turns?

    I read it as an autotransformer. In that case you have exactly the same number of turns, but the tap is in a different position. Edit: and it's also dangerous.
  16. (*steve*)

    Finding a good soldering iron....

    What brand are you using @Audioguru? I'm currently using Kester.
  17. (*steve*)

    Finding a good soldering iron....

    I 100% agree with this. You can do perfectly good solder joints with 60/40 solder, but the difference between it and 63/37 is like night and day.
  18. (*steve*)

    Question about a bluetooth headphone battery.

    Thanks @Audioguru that's what I meant to say :-)
  19. (*steve*)

    The curve of the sun?

    It's more complex than that.. If it were that simple you would have to be at exactly 90 degrees of latitude to have 24 hours of daylight . As you can see, 70 degrees is sufficient to get 24 hour long days. I suspect that 66.5 degrees would be sufficient to get at least one 24 hour day due to...
  20. (*steve*)

    Micronta VOM

    Can you see a 9Ω, 90Ω, 72Ω and 7.5Ω resistor in this area? If you can only see 3 out of 4 of them then you know which one you burnt :-) Which range was it on when you had this little accident (and what did you do)? Have you confirmed that other ranges still work?
Top