Today's Message Index:
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1. 06:13 AM - LEDS (Bob Gibfried)
2. 12:01 PM - Wanted-Narco Transponder Tray ()
3. 02:13 PM - Re: LED-based logo lights (Doug McNutt)
Message 1
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--> Avionics-List message posted by: "Bob Gibfried" <rfg842@cox.net>
Don't know a thing about the technical aspect of installing LEDs but one
thing really caught my eye; the use of a red light on the tail.
Aircraft have a red light on the left wingtip, a green light on the right
wingtip and a white light on the tail. In flight at night you can tell the
direction of flight by the color you see. Don't believe an inspector would
approve an aircraft for fight with any other color arrangement.
Better check with your air worthiness inspector before you go to all that
work.
Bob, Wichita
Message 2
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Subject: | Wanted-Narco Transponder Tray |
--> Avionics-List message posted by: <jlundberg@cox.net>
Does anyone have a Narco Transponder tray they want to sell?
Message 3
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Subject: | Re: LED-based logo lights |
--> Avionics-List message posted by: Doug McNutt <douglist@macnauchtan.com>
At 23:37 -0700 6/4/05, chad-c_sip@stanfordalumni.org wrote:
>Secondly, I've got a question about wiring up such devices. Usually when
>wiring an LED you put a current-limiting resistor in series with the LED and
>then put a bunch of such pairs in parallel. This helps to overcome the
>temperature/current correlation common in diodes (and bipolar transistors)
>that allows a single element in a parallel array to hog current and burn out
>first. However, I've got a 28v supply native to the aircraft and each LED is
>happiest with 3.4V. Could I simply put 7 of these in series with a small
>resistor to fix the desired current at 100-120 mA?
Yes.
It's also possible to prepare the "resistor" as a power transistor in the ground
side and hook up a few other components to make a constant current device. You
could get 8 LED's in series that way.
Someday I shall replace my instrument lights that way.
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--> If you are presented a number as a percentage, and you do not clearly understand
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