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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 2016-03-22 21:46 -0400
Organization A noiseless patient Spider
Message-ID <ncssb4$c6l$1@dont-email.me> (permalink)
References <0001HW.1CA0671B00048EC510F3873CF@news.eternal-september.org> <5ne1fbt0u9qop3jmdkdd18go76did4csr3@4ax.com> <ncr1vm$er3$1@dont-email.me> <19f13e72-91ed-416e-ac84-ad921a8848cd@googlegroups.com> <0001HW.1CA1E5910014C5FA1132D13CF@news.eternal-september.org>

Cross-posted to 4 groups.

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On 3/22/2016 4:41 PM, DaveC wrote:
> Circuit:
>
> http://imgur.com/YeELiHI
>
> which is identical to the application note in the datasheet (scroll down to
> the ME2108A diagrams):
>
> http://img.ozdisan.com/ETicaret_Dosya/431770_1622138.pdf
>
> (easily translated via Google, but a bit more confusing...)
>
> Measured current at the battery terminals is 275 mA (due to meter insertion
> loss it’s difficult to get an accurate current reading at the LED’s
> terminals--the LED dims). Voltage across the LED is a pretty-constant 4v.
> Estimating the efficiency of the converter at (roughly) 75 percent the LED is
> using 825 mW.
>
> I guess I’m looking for a 1W replacement?
>
> How’s my math?

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.

-- 

Rick

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Thread

Replacement LED? DaveC <not@home.cow> - 2016-03-21 10:30 -0700
  Re: Replacement LED? Bob Engelhardt <BobEngelhardt@comcast.net> - 2016-03-21 17:00 -0400
  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? 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? 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? "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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