Talk:Relay

message: To whoever is "managing" this page, may I suggest an external link to the "Heath Robinson Rube Goldberg (HRRG) Mixed Technology Computer" project at http://www.diycalculator.com/sp-hrrgcomp.shtml. The idea is to create a computer out of a mixture of implementation technologies, including relays, vacuum tubes, transistors, simple integrated circuits, pneumatic logic, magnetic logic, and so forth. — Preceding unsigned comment added by Memyselfmax (talk • contribs) 21 February 2007 (UTC)
:Just an FYI. No need to ask to add something. The person who is "managing" this page is you (well everyone that is). Good link idea so I am adding it. 69.72.2.72 01:48, 17 March 2007 (UTC)
thread_title:  Sugestion for External Link 

message: Information should be added to the "Relay" article defining the meaning of "poles" and "throws" such as SPDT and DPDT.  I would attempt to add it myself but I am fuzzy on it myself.
:Added the information. Please see if its ok. Rohitbd 12:59, 1 March 2006 (UTC)
thread_title:  SPDT, DPDT, ETC 

message: The article does not contain the circuit or schematic symbol of a relay. Rohitbd 12:20, 1 March 2006 (UTC)
replies: text: I will try to find one or draw it myself. Be patient, I just started. I have yet to play with the drawing utility Seán 23:46, 5 March 2006 (UTC)

text: It does indeed show the relationship of SPDT as compared to DPDT, however, a relay is usually depicted in the relaxed position. Seán 23:46, 5 March 2006 (UTC)
replies: text: Hmm...although I am not sure what a "relaxed position" means...perhaps you could make that change...? If it is any help, I have used MS-Paintbrush to create the image. Rohitbd 11:20, 6 March 2006 (UTC)

text: The relaxed position is where the contacts would be if the coil is not enegized. In the case of DPDT (double pole - double throw) the NC (normally closed) contacts would be closed. The contacts in the picture are shown midway between energized and relaxed. In a high current application this would cause a lot of arcing. I just printed out the page on how to upload graphic files. Seán 00:20, 8 March 2006 (UTC)
replies: text: Changed the image to reflect the relaxed position. Please see if it is ok. Also, please sign your posts with ~~~~. Rohitbd 19:38, 7 March 2006 (UTC)

text: There is a drawing somewhere on the relay itself. [] Seán 00:30, 8 March 2006 (UTC)

text: Notice how terminal 5 (common) is shown connected to terminal 1? This is the circuit when the coil is de-energized or relaxed. When the coil is energized or activated, terminal 5 will be connected to terminal 3. The coil is drawn as a zig-zag line. The symbol is similar to the symbol for a resistor. The drawing is simply trying to show a fixed load. The current draw of the coil is consistant no matter what current the contacts are carrying. Also notice how the coil is shown as a separate circuit? This is electrical isolation.Seán 03:01, 8 March 2006 (UTC)
thread_title:  Circuit symbol 

message: Someone needs to do a better job of describing latching relays, especially the simple latching relays that factory machines use (with green start buttons that are recessed and red stop buttons that have to  be pulled out to allow restart). Anthony717 23:10, 28 April 2006 (UTC)
thread_title: Latching relays

message: Not that you need it, but here's another image.  Fit it in if you want. — Omegatron 06:54, 10 June 2006 (UTC)
thread_title:  Images 

message: Is there any major application for an unusual thermal (not bimetallic) relay with these properties:
High current/low voltage (output)
huge operating temperature range (0K - 700K or so; theoretically as high as 2500K with the right materials)
operates better the smaller it is; power used is proportional to the cube of its size.  Theoretically would use less power than a transistor if you made it with transistor-scale dimensions.  As a macroscale device (millimeters across) uses milliwatts of power to switch and stay switched.
requires precision manufacturing and/or assembly to .03% of one dimension on a relative scale between two parts.  They can both be a little big, or both be a little small, but in the same proportion to .03% of that dimension.Cuberoot31 21:57, 26 October 2006 (UTC)
thread_title:  Unusual relay 

message: You say
Contactor relays can be extremely loud to operate, making them unfit for use where noise is a chief concern.
but you don't say if you are referring to the constant buzzing, or the kerchunk
upon closing and opening of the circuit.  Also see Talk:Contactor. Jidanni (talk) 01:19, 28 February 2008 (UTC)
thread_title:  Noise 

message: What about a gallery of different symbols to denote relays and their contacts?    Tabletop (talk) 09:36, 2 April 2009 (UTC)
thread_title:  Symbols 

message: I have seen these autoelectricians normally removing the relays if there is a problem and making the direct connections.
They say it can work without a relay. No problem.
As I am not a engineer, I do not understand the consequences of this.
Is it safe?  —Preceding unsigned comment added by 196.207.47.60 (talk) 17:46, 20 April 2009 (UTC)
thread_title:  Fuel pump relay in the CAR 

message: I think that it should be noted that protective relays are classically electromechanical, but more recently are microprocessor based. They compare digital values as opposed to analog current values.
205.162.225.4 (talk) 20:31, 14 May 2009 (UTC)
thread_title:  Protective Relays 

message: To reduce arcing between the contacts, you can put a resistor in series with a capacitor across the contacts to reduce the arcing. I've used it quite a few times, but only under instruction.
I've never calculated the values myself. It would be good to include the equations to calculate the values of R and C for a given contact rating and voltage.  —Preceding unsigned comment added by Wouse101 (talk • contribs) 09:06, 22 June 2009 (UTC)
thread_title:  Relay suppresion 

message: hi,
i want to know what will happen if u change the voltage accross the DC relay.
weather the relay is having permenent magent inside the relay as a moving part.  —Preceding unsigned comment added by 123.236.220.190 (talk) 11:47, 18 October 2009 (UTC)
thread_title:  reverse voltage in normal relay 

message: I would really like to see definitions of terms used to describe relays. Of particular interest to me are the terms non-zero, zero, and random used to describe solid state relays (and possibly others). 
70.127.202.34 (talk) 12:35, 2 July 2010 (UTC)
thread_title:  Glossary of terms used to describe relays on data sheets 

message: Who knows more about Hans Sauer, the inventor of miniature high power relays with 309 patents worldwide? http://de.wikipedia.org/wiki/Hans_Sauer_(Erfinder) --Hyperboreer 18:07, 15 August 2010 (UTC)
thread_title: Hans Sauer

message: instead using a semiconductor device to perform switching. I'm not sure how to do it I do not play in the sand box enough, however I suggest making semiconductor a link to the semiconductor page.  —Preceding unsigned comment added by 149.152.34.59 (talk) 18:48, 13 November 2010 (UTC)
thread_title:  Make it blue! 

message: There is a page Mercury relay that could be used to add in a new type easily.
Ther are a large range of coaxial relays used in RF and similar applications that have some interesting characteristics that make them unique.  They are designed to have better transmission line characteristics to minimise impedance mismatches.
There are relays that use fibre bending, micro mirrors and perhaps even accousto Optics (if the last is a new idea it is now public domain) to route optical signals from one oprical fibre to another, not sure if these should be mentioned in this article.
Idyllic press (talk) 12:32, 15 March 2013 (UTC)
thread_title:  Perhaps add in : Mercury relay, Coaxial relay, Optical relay 

message: i would like to get some advise on weather one would be able to use relays instead of a plc?
: WP isn't the place for advice, but some of the links can be useful. The PLC article might give you a better start.
: PLCs began as a substitute for relay-based ladder logic controllers. So for small PLCs, there's still overlap with relays. If you understand ladder logic, you can convert the programming from one to the other.
: That said, I wouldn't convert a PLC to relays. You can do a lot of programming in a very small, very cheap PLC. With relays, that would cost far more.  So for something needing only a few relays, this might be workable. Otherwise the PLC keeps the advantage. Building relay systems, changing them and future maintenance is also more awkward. 
: If you need reliable future maintenance, then relays might have an advantage. Especially if you have a simple problem with lots of outputs, rather than a complicated problem with only a few. Andy Dingley (talk) 09:26, 23 April 2015 (UTC)
thread_title:  using relays in place of plc's? ([[Special:Contributions/197.88.31.224|197.88.31.224]] ([[User talk:197.88.31.224|talk]]) 09:16, 23 April 2015 (UTC)) 

message: I am aware that different material are/have been used to form the contact surfaces of relays, including gold for low voltage/low current applications and some silver compounds for others - the latter having the undesirable side-effect of degrading if not enough current is passed through them.  Can anyone provide more information on this? There is a little coverage for the specialised mercury-wetted case but what about others? SlySven (talk) 12:27, 16 January 2016 (UTC)
replies: text: Just because somebody asks for something to be added doesn't mean you can ignore the verifiability policy. Every Wikipedia editing webpage clearly states, "Encyclopedic content must be verifiable." Please supply references before reintroducing this content again, per WP:BURDEN. I tagged this article  in 2009, and ever since then you have been adding uncited content—completely ignoring both the tag and the policy. You have been rude to me on this and other articles, reverting my maintenance tags with the unjustified excuse of "drive-by tagging", and reverting my efforts to minimize uncited claims. You have even called me incompetent, yet I am not the one ignoring policy. Clearly, you do not like these polices, and do not believe they apply to you (i.e. you are special). If your personal beef with our policies continues, I will have to report the issue to ANI. – voidxor 19:10, 7 January 2018 (UTC)
replies: text:  Or, we could grow the encyclopedia and identify that the paragraph needs a citation.  Could we maybe find references instead of tagging? Or cutting out scary paragraphs that might frighten people who feel insecure if there isn't a little blue number following every sentence? --Wtshymanski (talk) 19:23, 7 January 2018 (UTC)
replies: text:  Exactly what part of WP:BURDEN don't you understand? The burden is on you to supply references at the time that you add content. The  tag is meant to mark existing uncited content, not as a way to circumvent verifiability policy. – voidxor 19:34, 7 January 2018 (UTC)
replies: text: You know, without a threshold level of competence assumed in every editor, this whole system falls apart? Do we still have that essay about not needing to cite that the sky is blue?  --Wtshymanski (talk) 20:00, 7 January 2018 (UTC)
replies: text: You mean WP:BLUE?  It is an essay not a policy. See also WP:NOTBLUE which says pretty well the exact opposite, but that is also an essay and not policy.  What is policy is WP:BURDEN. The burden is on any editor adding material to Wikipedia or re-adding material deleted as unreferenced to provide the required references in support of that material. Simply restoring the content without providing the supporting references is disruptive editing no matter how obvious you regard the content to be. — Preceding unsigned comment added by 86.149.141.199 (talk) 17:12, 8 January 2018 (UTC)
replies: text:  Agreed. The contempt, such as in , is unnecessary. And I really don't get "the sky is blue" argument; anybody who thinks that three-phase power is as universally understood as the as the sky color needs to get out more often. – voidxor 01:52, 26 January 2018 (UTC)
thread_title:  Contact Materials 

message: Plenty of sources online, if you google it.  Surprised it's not here, given they are used on motors and compressors. — Preceding unsigned comment added by 175gw (talk • contribs) 15:23, 12 June 2020 (UTC)
thread_title:  Potential Relays missing. 

message: Uses described in the lead are about one circuit controlling another.  It seems obvious to me that it could just as well be a single circuit controlling itself.
Simple on/off switching is perhaps a typical example.  It's very simple to implement on/off buttons with a relay.  It is also a way in which an electronic device can power itself on and off.  OK, so strictly speaking something can't power itself on, but I can imagine a device having a standby subcircuit for this.
Is this a use relays are put to to any significant extent?  Or is there another method that is typically used for on/off switching of these kinds? — Smjg (talk) 16:40, 20 August 2023 (UTC)
thread_title:  Another use case?