Groups > sci.electronics.repair > #71119

Re: Replacement LED?

From	rickman <gnuarm@gmail.com>
Newsgroups	sci.electronics.repair, sci.electronics.design, sci.electronics.components, alt.engineering.electrical
Subject	Re: Replacement LED?
Date	2016-03-23 00:19 -0400
Organization	A noiseless patient Spider
Message-ID	<nct5ah$v2h$1@dont-email.me> (permalink)
References	(2 earlier) <ncr1vm$er3$1@dont-email.me> <19f13e72-91ed-416e-ac84-ad921a8848cd@googlegroups.com> <0001HW.1CA1E5910014C5FA1132D13CF@news.eternal-september.org> <ncssb4$c6l$1@dont-email.me> <0001HW.1CA2302100263FB51132D13CF@news.eternal-september.org>

Cross-posted to 4 groups.

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On 3/22/2016 10:00 PM, DaveC wrote:
> On 22 Mar 2016, rickman wrote
> (in article <ncssb4$c6l$1@dont-email.me>):
>
>> Didn't you say it used a *single* 1.5 volt AA cell? I think that would
>> make it 412 milliwatts not counting the conversion efficiency, so more
>> likely a 1/2 watt LED.
>
> 1.5v boosted to 4v (measured) output from the converter. 275 mA (measured) at
> the battery terminals. I make that to be 1100 mW. If presume 75 percent
> efficiency, 825 mW.
>
> No?

Perhaps I am missing something.  The battery terminals will be at the 
battery voltage, no?  So why would you use 4 volts which is at the 
output?  It would be 4 volts times the LED current or the battery 
voltage times the input current.

-- 

Rick

Thread

Replacement LED? DaveC <not@home.cow> - 2016-03-21 10:30 -0700
  Re: Replacement LED? "pfjw@aol.com" <pfjw@aol.com> - 2016-03-21 13:10 -0700
    Re: Replacement LED? "Gareth Magennis" <soundserviceleeds@outlook.com> - 2016-03-21 20:33 +0000
      Re: Replacement LED? "Gareth Magennis" <soundserviceleeds@outlook.com> - 2016-03-21 22:56 +0000
    Re: Replacement LED? Cursitor Doom <curd@notformail.com> - 2016-03-21 21:38 +0000
  Re: Replacement LED? Bob Engelhardt <BobEngelhardt@comcast.net> - 2016-03-21 17:00 -0400
    Re: Replacement LED? "pfjw@aol.com" <pfjw@aol.com> - 2016-03-21 17:01 -0700
  Re: Replacement LED? John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-21 20:05 -0700
  Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-21 20:51 -0700
    Re: Replacement LED? Phil Allison <pallison49@gmail.com> - 2016-03-21 22:35 -0700
    Re: Replacement LED? DaveC <not@home.cow> - 2016-03-21 22:56 -0700
      Re: Replacement LED? N_Cook <diverse@tcp.co.uk> - 2016-03-22 15:42 +0000
      Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-22 16:42 -0700
        Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 16:56 -0700
          Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-22 18:16 -0700
            Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 18:56 -0700
              Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-23 11:11 -0700
                Re: Replacement LED? DaveC <not@home.cow> - 2016-03-23 21:50 -0700
                Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-23 22:49 -0700
                Re: Replacement LED? DaveC <not@home.cow> - 2016-03-24 14:02 -0700
        Re: Replacement LED? not@telling.you.invalid (Computer Nerd Kev) - 2016-03-24 21:44 +0000
    Re: Replacement LED? Syd Rumpo <usenet@nononono.co.uk> - 2016-03-22 09:10 +0000
      Re: Replacement LED? Phil Allison <pallison49@gmail.com> - 2016-03-22 04:01 -0700
        Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 13:41 -0700
          Re: Replacement LED? rickman <gnuarm@gmail.com> - 2016-03-22 21:46 -0400
            Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 19:00 -0700
              Re: Replacement LED? rickman <gnuarm@gmail.com> - 2016-03-23 00:19 -0400
                Re: Replacement LED? DaveC <not@home.cow> - 2016-03-22 22:23 -0700
                Re: Replacement LED? DaveC <not@home.cow> - 2016-03-23 11:52 -0700
                Re: Replacement LED? "Ralph Mowery" <rmowery28146@earthlink.net> - 2016-03-23 10:31 -0400
    Re: Replacement LED? Andre Majorel <cheney@halliburton.com> - 2016-03-26 19:56 +0000
      Re: Replacement LED? John Larkin <jjlarkin@highlandtechnology.com> - 2016-03-27 10:20 -0700
      Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-28 19:21 -0700
        Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-29 19:15 -0700
        Re: Replacement LED? "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-03-31 04:20 -0400
          Re: Replacement LED? Jeff Liebermann <jeffl@cruzio.com> - 2016-03-31 08:34 -0700
          Re: Replacement LED? krw <krw@nowhere.com> - 2016-03-31 20:10 -0400
            Re: Replacement LED? "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-04-01 17:21 -0400
              Re: Replacement LED? krw <krw@nowhere.com> - 2016-04-01 19:14 -0400
                Re: Replacement LED? "Michael A. Terrell" <mike.terrell@earthlink.net> - 2016-04-01 19:43 -0400
        Re: Replacement LED? Andre Majorel <cheney@halliburton.com> - 2016-03-31 10:40 +0000

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