A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Paul Dolkas
Date: 2016 Aug 18, 23:11 -0700
There are LEDs (red and other colors) that come in the standard screw-in 1.5 v bulb format. Hard to find, but they exist. When I did mine, the only red ones available were 3V, so I had to use a 3V lithium C cell to fit with the C cell battery holder in the Link 12
From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Bruce Cutting
Sent: Thursday, August 18, 2016 11:44 AM
Subject: [NavList] Re: LED conversion Astra IIIB
Led conversion should be easy. The resistor will not be very effective at
limiting the intensity - there should be a resistor to limit the current
to the design spec of the particular LED selected though. Calculte as
follows R= (VB - VL)/IB VL = LED voltage drop; VB = battery voltage, IB =
specified LED current.
> You probably want to switch to red LEDs and diminish the intensity by
> adding another resistor in series.
> This will help to preserve your night vision sensitivity
> On Aug 18, 2016 8:30 AM, "Dale Bletso" wrote:
>> Celestaire said the IIIB couldn't be upgraded to LED illumination, so I
>> coverted mine in 15 minutes. Now no more burned out bulbs in the middle
>> a run.
>> *Attached File: *
>> View and reply to this message
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