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    Re: LED for Marine Sextant
    From: Robert Eno
    Date: 2006 Sep 8, 12:54 -0500

    Thanks Doug,

    A few more questions:

    Did you have re-configure the light bulb recepticle or were you able to obtain an LED that screwed into the existing recepticle.

    Can you recommend a particular supplier?  There are none anywhere in my particular part of the world.

     

    Robert

     

    ----- Original Message -----

    From: "Royer, Doug" <Doug.Royer@remecrds.com>

    Date: Friday, September 8, 2006 1:10 pm

    Subject: [NavList 1235] Re: LED for Marine Sextant





    > ________________________________



    > Does anyone out there know if one can obtain LED arc illumination 
    > bulbsfor a C.Plath/Cassens and Plath?





    > Robert,

    > Yes there are many types to be used. I've changed all my illumination
    > set-ups on each of my sextants to use LEDs.

    > Mail order houses/catalogs such as Newark, mouser, Digi-Key etc have
    > what you will need. In your town I'll wager there are surplus 
    > electronichouses that can give you what you need. 

    > On all my sextants the power for illumination is from a bank of 
    > two AA
    > batteries stacked in series in the handle.This will give you about 3
    > vdc. The LED should drop about 1.7 vdc of this across itself. 
    > Sometimesyou will need to add a current limiting resistor in 
    > series with the LED
    > to limit the current to about 20 m.a. At 3 vdc that will be about 75
    > ohms.

    > On mine I just didn't use the resistor because the light is not
    > activated for long periods of time and I've yet had one burn out.

    > I really like using the H.P. single element light bars in my set 
    > up. The
    > yellow wavelength lights I like the best. Red works but, for me, the
    > yellow is easier to see.









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