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Groups > sci.electronics.design > #453335
| Newsgroups | sci.electronics.design |
|---|---|
| Subject | Re: two relays |
| From | Steve Wilson <no@spam.com> |
| References | <tel8dct1m6hh8g1du8397rimao0d6o5dp5@4ax.com> <e5908be6-b3ff-4b34-a16b-4d6c65a8e006@googlegroups.com> <XnsA741D03D233DAidtokenpost@69.16.179.23> <av09dclunhlge9a8f1isacfsqq1n7qvqc8@4ax.com> |
| Message-ID | <XnsA74297D7D122idtokenpost@69.16.179.22> (permalink) |
| Organization | http://www.NewsDemon.com |
| Date | 2017-03-24 04:55 +0000 |
John Larkin <jjlarkin@highlandtechnology.com> wrote: > On Fri, 24 Mar 2017 00:28:14 GMT, Steve Wilson <no@spam.com> wrote: > >>whit3rd <whit3rd@gmail.com> wrote: >> >>> On Thursday, March 23, 2017 at 4:10:56 PM UTC-7, John Larkin wrote: >>>> https://dl.dropboxusercontent.com/u/53724080/Circuits/Power/Two_Relays >>>> .JPG >>>> >>> >>> Resistors are a waste of power, Zeners are relatively expensive, and >>> choosing to use 5V relays when one only has 12V power is... not the >>> best design decision. Besides, Zeners sometimes fail short. >>> >>> One could also use an LM317 as current source, putting the two relay >>> coils in series, with the switches shunting each coil... >>> GAAA now you've got ME doing this silly stuff! >> >>Agreed. A silly problem that wastes everyone's time. >> >>What drives the SPST and SPDT switches in (A) (B) and (C)? Are they 12V >>relays? If not, do they require additional resistors and zeners? >> >>What happens to two zeners in series with an overvoltage on the 12V >>supply? >> >>Why not simply use a 12V version of the 5V relays? >> >>Or use a 5V supply? >> >>The problem is not scalable. What if you have to drive three relays? > > Actually, I do have to drive three relays. Easy Peasy. Just use the SPST or SPDT contacts in your (A)(B) and (C) switches. Problem solved. Next?
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two relays John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-23 16:10 -0700
Re: two relays Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-23 16:27 -0700
Re: two relays John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-23 16:46 -0700
Re: two relays Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-23 17:00 -0700
Re: two relays Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-03-24 02:49 -0400
Re: two relays John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-24 08:14 -0700
Re: two relays tabbypurr@gmail.com - 2017-03-24 08:55 -0700
Re: two relays Spehro Pefhany <speffSNIP@interlogDOTyou.knowwhat> - 2017-03-24 19:26 -0400
Re: two relays John Larkin <jjlarkinxyxy@highlandtechnology.com> - 2017-03-24 17:37 -0700
Re: two relays whit3rd <whit3rd@gmail.com> - 2017-03-23 17:08 -0700
Re: two relays Steve Wilson <no@spam.com> - 2017-03-24 00:28 +0000
Re: two relays John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-23 19:27 -0700
Re: two relays Steve Wilson <no@spam.com> - 2017-03-24 04:55 +0000
Re: two relays John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-24 08:18 -0700
Re: two relays Bob Engelhardt <BobEngelhardt@comcast.net> - 2017-03-24 13:29 -0400
Re: two relays bitrex <bitrex@de.lete.earthlink.net> - 2017-03-24 11:17 -0400
Re: two relays John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-24 09:07 -0700
Re: two relays bitrex <bitrex@de.lete.earthlink.net> - 2017-03-24 16:21 -0400
Re: two relays tabbypurr@gmail.com - 2017-03-24 14:28 -0700
Re: two relays bitrex <bitrex@de.lete.earthlink.net> - 2017-03-24 18:26 -0400
Re: two relays tabbypurr@gmail.com - 2017-03-25 01:00 -0700
Re: two relays bitrex <bitrex@de.lete.earthlink.net> - 2017-03-25 12:55 -0400
Re: two relays krw@notreal.com - 2017-03-25 13:34 -0400
Re: two relays George Herold <gherold@teachspin.com> - 2017-03-23 17:18 -0700
Re: two relays bloggs.fredbloggs.fred@gmail.com - 2017-03-24 06:27 -0700
Re: two relays John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-24 08:19 -0700
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