Simplest electromechanical relay circuit

[RosemontCrest]

Science and engineering are not a democracy. You're a pathetic little idiot nothing of a person to fall back on that puny non-justification, and you're too dumb to realize just how idiotic you look to anyone with a working knowledge of the technology. Imbeciles like you make the internet the trash heap of misinformation, ignorance and mediocrity it is today. The bottom line is you don't know what you're talking about. STFU and go away.

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

 

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

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.

 

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

Drop dead.

 

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

 

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On Tue, 24 Dec 2013 10:25:57 -0800 (PST),

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

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.

 

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

Drop dead.

That wouldn't even make you happy, Bloggs. You lefties are incapable
of happiness (or telling the truth).

 

[Maynard A. Philbrook Jr.]

Don Y's words were "Ditto with fuse placement, "power switch", etc.

" 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!

Jamie

 

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" 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!

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

 

[Don Y]

Hi Jim,

On Mon, 23 Dec 2013 12:35:12 -0800 (PST), Lasse Langwadt Christensen

When I was a kid, they'd routinely offer tours of the local nuke
to educate us on the "promise" of nuclear energy.

My MIT radar systems class got a guided tour of a _working_ Nike base
in New Hampshire... and they demonstrated their skills by tracking
planes landing at Boston's Logan International Airport ;-)

(The tour also included demo-ing the dogs and showing the automated
diesel-powered electric plant instantly coming on-board in case of a
power failure.)

Wonder if they would allow such a tour now ?>:-}

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!

 

[John S]

You lost me.


You might want to re-think your feelings. I earned an electronics
merit badge in Boy Scouts over fourty-five years ago. I started
designing my own electronic circuits in junior high school. I started
taking EE classes after high school and my first job was with a
company that manufactured electronic medical devices (brain scanners).

Now, don't you feel silly? (You ought to even if you don't.)

The only reason I'm troubling myself to school you is that you offered
up a good suggestion in another followup. You more or less said told me
to look at the datasheet. Excellent advice!

Too bad that this datasheet lacks an example circuit, ergo my post.
http://datasheet.octopart.com/RP710024-Tyco-Electronics-datasheet-12624042.pdf

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
added.

HTH,
John S

 

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Check again. It's been a requirement to switch the hot for as long as

I can remember. If you can't find the paragraph, ask the local

electrical inspector.



Joe Gwinn

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.

 

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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!



Jamie

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.

 

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The power of Google brought this to the first screen:



..<http://www.mikeholt.com/mojonewsarchive/NEC-HTML/HTML/Article-404-Swi

tches~20040624.php>



Joe Gwinn

No argument there, but it as nothing to do with how you wire things up inside a standalone box or product.

 

[Maynard A. Philbrook Jr.]

About a week ago Don Kuenz asked a question about relays.

Does anyone in here consider a relay to be an active device?
A 1-liner on why, or why not, would probably be interesting.
More if you feel like it!

Thanks!

just think about what constitutes an ACTIVE device!

Jamie

 

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Let me say it another way. A lot of experience with accidents went

into the development of the NEC over the years. The NEC is written in

blood.

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.

 

[[email protected]]

Again, the point many people were making was that while NEC et al do
not govern homebrew stuff, for safety one generally switches the hot,
not the neutral.

Let me say it another way. A lot of experience with accidents went
into the development of the NEC over the years. The NEC is written in
blood.

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

 

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

talking about.

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.

 

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On Fri, 27 Dec 2013 19:30:22 -0800 (PST),

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.

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.

 

[Jasen Betts]

About a week ago Don Kuenz asked a question about relays.

Does anyone in here consider a relay to be an active device?
A 1-liner on why, or why not, would probably be interesting.
More if you feel like it!

yes, above unity power gain implies acive.

 

[Don Kuenz]

yes, above unity power gain implies acive.

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).

http://www.allaboutcircuits.com/vol_3/chpt_1/2.html

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."

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