Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > sci.electronics.design > #453461

Re: two relays

Show all headers | View raw

On 03/24/2017 05:28 PM, tabbypurr@gmail.com wrote:
> On Friday, 24 March 2017 20:21:13 UTC, bitrex  wrote:
>> On 03/24/2017 12:07 PM, John Larkin wrote:
>>> On Fri, 24 Mar 2017 11:17:53 -0400, bitrex
>>> <bitrex@de.lete.earthlink.net> wrote:
>>>
>>>> On 03/23/2017 10:27 PM, John Larkin wrote:
>>>>
>>>>>> 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.
>>>>>
>>>>>
>>>>
>>>> I thought engineering was sometimes described as "making what you need
>>>> out of what you have."
>>>>
>>>> Sometimes a 12V supply and 5V relays is what you have.
>>>
>>> We try to avoid adding new parts to stock. We have 6640 stock numbers
>>> already.
>>>
>>>
>>
>> My idea for a "fault tolerant" version:
>>
>> <https://www.dropbox.com/s/hnkq65xj4nv5r6e/File%20Mar%2024%2C%204%2006%2016%20PM.jpeg?dl=0>
>>
>> Haven't tested. Or Spiced. May not work...
>
> Are you one of those unlimited budget people?
>
>
> NT
>

SOT-23 TL431s are like 4 cents...

Back to sci.electronics.design | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

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

csiph-web