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  1. Miguel Lopez

    transformer

    Yes, usually the number (in cm^4) is around 75% of the actual value, but it can vary with the geometrics of the central column. It is more accurate if the cross section tend to be square. It fails a lot in a core type with rectangular cross section; in this case, the value will be around 40% of...
  2. Miguel Lopez

    home powered water pump generator.

    As the original water tank could not be enough, then you should take into account what is the volume of water you want to collect in your loft. If it is too much, your ceiling could collapse under that weight.
  3. Miguel Lopez

    transformer

    Try to measure dimensions of the central column of the core (in centimeters), and then calculate the effective area of that column (in square centimeters). Squaring that value will give you an approximate idea of how many watts your transformer can manage. This value will always be under the...
  4. Miguel Lopez

    Newbie 1st Post - Soldering Iron Advice

    Hello CubeRider. Don't buy any soldering iron, build one. Be a DIYER. See the following link: https://www.electronicspoint.com/frankensteins-components-t254697.html#post1512588 :D :D :D :D :D :D :D ***************************************************************** PS: This is...
  5. Miguel Lopez

    Load suggestions for 24V linear power supply prototype

    A big wattage variable resistor with an ammeter in series, and a voltmeter across the output terminals. I usually use wired resistors for this.
  6. Miguel Lopez

    Designing a DC link Capacitor

    You can use Ohm's Law, but to be honest, in the diagram I used "trial and error" in the simulation software. R = V / I http://en.wikipedia.org/wiki/Ohm%27s_law
  7. Miguel Lopez

    Designing a DC link Capacitor

    I guess we're talking about something like this. The value of the capacitor is not correct. I just wrote any number. Anyway in this case it means that you will supply a load of only 1,55 ohms. I think the 900A value is too high. Althought the 3 phase bridge rectifier gives a decent DC level at...
  8. Miguel Lopez

    Designing a DC link Capacitor

    Do you mean a three phase bridge rectifier supplying a pure resistive load? 600V - 900A? Do you need to calculate the smoothing capacitor for 10% ripple?
  9. Miguel Lopez

    Transistor help!

    Yes, detecting the change in the current consumption can be an option. Sorry, no idea. Everything depends on the design of your smoke detector and the panel.
  10. Miguel Lopez

    Transistor help!

    That's why transistors are used. To amplify signals. Do you have any draft of the circuit you intend to build? Take care. Smoke detectors usually contains radioactive materials. AFAIK, they use the radioactive material to ionize certain piece of space between two electrodes to allow current...
  11. Miguel Lopez

    Relay acvitation on multiple Temperatures of an Object??

    Can you get an RTD? You could attach it to the pipe and sense its resistance change and with a couple of opamp's do the job. A thermocouple could be nice too but maybe it would require more circuitry.
  12. Miguel Lopez

    Help with voltage doubler

    And don't use the term "some people". We have names (nicknames at least)
  13. Miguel Lopez

    Help with voltage doubler

    Good explanation here: http://en.wikipedia.org/wiki/Voltage_doubler
  14. Miguel Lopez

    Would Like A Recommendation

    Try the evaluation version of Multisim 11.0 http://www.ni.com/multisim/try/
  15. Miguel Lopez

    Basic electronics help

    Try any of these. They are free to download. http://archive.org/search.php?query=transistor%20AND%20collection%3Aopensource
  16. Miguel Lopez

    Delaying an 'on' signal

    Also monostable circuits could help, such 555, 4047. But you should design a circuit and build it. The TDR solution could be better.
  17. Miguel Lopez

    help please

    If you already have a coin detector, then the question is: What kind of signal that coin detector gives when it detects the coin? Can you tell us that? Using that signal (i.e: a digital level change) you could trigger a monostable (i.e: 555, 4047) and this monostable could power the relay for...
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