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  1. (*steve*)

    Relay switching

    3 wires going to that relay board. That means it's using a transistor (or similar) to actually turn the relay on.
  2. (*steve*)

    Calibrating GOS522B Scope

    Looks ok to me. There may be some trace rotation, and without knowing the vertical settings and details about the probe, it's hard to say if the trace is right. There is no need to connect the ground clip because the signal source shares the same ground as the rest of the oscilloscope
  3. (*steve*)

    choosing the right rectifier

    Probably.
  4. (*steve*)

    DSP - Aliased Signals

    What I mean is that it's a solution for a[n] == b[n], wa == wb, but with a[n] == 0. This is a subset of the solution for part C, and I only gave it to illustrate that your answer will be a series. You're already aware of this, so it wasn't much help. Once you have a series, you should be able...
  5. (*steve*)

    Parallel and series generator and batteries

    The easiest way might be to have each turbine charge of battery. This assumes they have similar output and both are on-line.
  6. (*steve*)

    DSP - Aliased Signals

    For part C you have given a single value. Do you think there is just one solution? An incomplete solution would have all the values equal to zero. For a 20Hz sample frequency, the signal frequency could be 10Hz, 20Hz, 30Hz,... For a 50Hz sample frequency, the signal frequency could be 25Hz...
  7. (*steve*)

    Converting a 48v sine wave inverter board to 96v

    Your link didn't work for me. But I think you can probably just replace the mosfets. However there will likely be other things that need to be looked at as well. The power supply to the chip in the module may need to be checked.
  8. (*steve*)

    Mysterious PSU Chip - please help!

    Don't worry about those lumps. That device has lumpy things under a coating. How did you measure the current? Please tell me you didn't place a multimeter on the current range across the output. Why do you suspect the power supply of having failed? What voltages does it give you on the outputs?
  9. (*steve*)

    Help to find a transistor replacement (microelectronic component)

    Could be a 2N7002 See here http://www.diodes.com/_files/datasheets/ds11303.pdf
  10. (*steve*)

    Buck convertors

    Yep. Most likely (almost certainly) the current limit will be detecting and limiting the peak current in the inductor. In practical terms, the output current can't exceed that. Remember that this is the current which is available, not the current which will be supplied. Also the buck...
  11. (*steve*)

    Voltage on a white LED.

    5000K is daylight Anything less than that is warm (3200K is a typical warm white), but practically something less than 5000K is often referred to as "cool white" even though 5000K is actually pretty neutral. Monitors are often set up for about 9000K. A clear blue sky starts about 10,000K and...
  12. (*steve*)

    LED

    Assuming you want white, this is a close fit.
  13. (*steve*)

    LED

    Start looking here.
  14. (*steve*)

    How to remove solder from plated-through holes?

    Noted.
  15. (*steve*)

    Secure Brief Case - Electronically activated lock

    From what you've said, if you can't find something existing, a microcontroller based approach is likely to be smaller, cheaper, and require less battery power. Try to prototype something up on an arduino.
  16. (*steve*)

    Multisim - How do I find the Resonant Frequency (FR) on an LRC circuit?

    Do you know what happens at the resonant frequency?
  17. (*steve*)

    How to remove solder from plated-through holes?

    Hand held manual solder suckers have their place. I find them very good for doing what you want to do if you have at lest three hands and at least one eye that you can move to a different location. The simple instructions are: Hold the board vertically with one land and use your second hand...
  18. (*steve*)

    impose current ceiling

    That's still a pretty small heat sink. Go to the resource on heatsinks and calculate the size heatsink you need.
  19. (*steve*)

    Capacitor Voltage Divider

    Or a switch mode regulator.
  20. (*steve*)

    Capacitor Voltage Divider

    Is this for DC? If so, capacitors won't work. What are you trying to do?
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