NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: LED for Marine Sextant
From: Robert Eno
Date: 2006 Sep 8, 12:54 -0500
>
>
>
> ________________________________
>
>
>
> 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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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.
>
>
>
>
>
>
>
>
>
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---