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Groups > sci.electronics.design > #453295
| 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> |
| Message-ID | <XnsA741D03D233DAidtokenpost@69.16.179.23> (permalink) |
| Organization | http://www.NewsDemon.com |
| Date | 2017-03-24 00:28 +0000 |
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?
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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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