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Simplest electromechanical relay circuit

Discussion in 'Electronic Design' started by Don Kuenz, Dec 22, 2013.

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  1. I wish for you a very merry Christmas and prosperous new year.
  2. Guest

    Don't worry about Bloggs. I'm sure Obama will have a COLA for welfare
    recipients this year and perhaps a couple of new programs.
  3. Guest

    Drop dead.
  4. Guest

    You should talk, you're nothing but a low life Defense sector ripoff and workfare parasite.
  5. Guest

    On Tue, 24 Dec 2013 10:25:57 -0800 (PST),
    You lefties are so fond of lies, you're incapable of anything else.

    I don't work in the defense industry but don't let the facts get in
    the way of your lies. You lefties never do.
  6. Guest

    On Tue, 24 Dec 2013 10:24:02 -0800 (PST),

    That wouldn't even make you happy, Bloggs. You lefties are incapable
    of happiness (or telling the truth).
  7. " No one refers to relay contacts as "power switch." Power switch means
    that gizmoid with ON/OFF labels that you work manually. Looks like it's
    remedial reading time for you.Bloggs, I think you should stay out of this one..

    In the industry, a contact/contactor is a power switch. They
    switch a variety of sources to loads.. Manual has nothing to do
    with it.

    Better have a drink and think about it before you reply. Better yet,
    have two or more!

  8. Guest

    Oh, hell no! Morons like Bloggs make *mean* drunks.
  9. Don Y

    Don Y Guest

    Hi Jim,

    When I was a kid, they'd routinely offer tours of the local nuke
    to educate us on the "promise" of nuclear energy.
    At Charles Stark Raving, it was commonplace to wander into the
    "security office" after hours.

    ~25+ years ago, they gave tours *inside* Cheyenne Mountain Complex.
    Pretty cool -- even though they don't show you any of the "good
    stuff". (the springs were really cool, though -- and, of course,
    the blast door! insane to see what you can do with infinite money!)
    At the time, we had to preregister weeks in advance, provide a SSN,
    etc. before being allowed in the mountain. Now, I think, the tours
    are no longer offered. Glad to have had that opportunity!

    Happy Holidays!
  10. John S

    John S Guest

    Hi, Don -

    Nice relay. The data sheet tells everything you need to know. If you
    look at the Coil Operating Range DC graph, you will see that it is
    capable of operation up to 70C at the specified coil voltage of 24V.

    It is not necessary to add a resistor to keep the coil from burning up.
    A diode or snubber around the coil might be needed depending on your
    push button specs or other requirements.

    The simplest circuit is therefore the pushbutton and relay if you do not
    need transient suppression. Otherwise a diode or snubber will need to be

    John S
  11. Guest

    You're the one who made the assertion, not me, so you find it. NEC does not assume jurisdiction over relays in products external to the fixed electrical wiring.
  12. Guest

    The contactor has a completely different symbol from the power switch on the schematic. Of course a contactor is a power switch, but, and this is a tough one, a contactor is called a....wait for it...contactor, and a switch is called a switch. Sounds like you already got a headstart on me in the drinking department.
  13. Guest

  14. just think about what constitutes an ACTIVE device!

  15. Guest

    NEC is authored by NFPA, founded a little over a hundred years ago. It's fundamentally a fire prevention code. Accident prevention is achieved by grounding and that's about it.
  16. Guest

    You are certainly correct. Bloggs, as usual, doesn't know what he's
    talking about.
  17. Guest

    You couldn't rewire a house lamp...then we already know you don't know how to screw a bulb in it after you get through screwing up the wiring.
  18. Guest

    On Fri, 27 Dec 2013 19:30:22 -0800 (PST),
    You lefties always lie. You're incapable of anything else. You're
    too stupid to use a real newsreader/server, as well. You really are
    as dumb as Slowman.
  19. Jasen Betts

    Jasen Betts Guest

    yes, above unity power gain implies acive.
  20. Don Kuenz

    Don Kuenz Guest

    An entry for "active device" is missing from my _IEEE Standard
    Dictionary_. _The Art of Electronics_ mentions, in passing, "The
    transistor is our most important example of an 'active' component."
    That's it. My textbooks also contain no definition so it seems that one
    must use the Inet to find a working definition.

    An active device is any type of circuit component with the
    ability to electrically control electron flow (electricity
    controlling electricity).

    A relay certainly controls electron flow as much as a transistor switch.
    As mentioned previously, _The Art_ says that a transistor is an active
    component. Ergo, my vote on the matter is also, "Yes." :)

    __/ \
    / \__/
    \__/ Don Kuenz
    / \__
    \__/ \
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