NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Heath Hezzanith question
From: Chuck Taylor
Date: 2007 Oct 22, 21:28 -0700
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From: Chuck Taylor
Date: 2007 Oct 22, 21:28 -0700
Why not use an LED? Radio Shack sells a 5 mm red LED for $1.99. It draws 20 ma at 1.7 volts (typical). My sextant takes two penlight batteries (3 volts). To make this work without smoking the LED, I would need to solder in a resistor of the proper value in order to drop the voltage to 1.7 volts. But first I would have to do the math to compute the proper value for the resistor. I think I'll stick with the red marker. :-)
Bonus question: What size resistor would I need?
Cheers,
Chuck Taylor
48 N
122 W
Gary LaPook writes:
Why not use this opportunity to join the 21st century and use a red LED (light emitting diode) cheap at Radio Shack, uses almost no current and lasts forever?
gl
Chuck Taylor wrote:
Bonus question: What size resistor would I need?
Cheers,
Chuck Taylor
48 N
122 W
Why not use this opportunity to join the 21st century and use a red LED (light emitting diode) cheap at Radio Shack, uses almost no current and lasts forever?
gl
Chuck Taylor wrote:
red nail polish on the bulb or lens.
I use a red felt-tip marker for coloring the bulb on my boat's compass. It works well. It would likely work also on a sextant light. I picked up that trick from a compass repairman at a boat show.
Chuck Taylor
48 N
122 W
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