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Plane Power's Friendly Warning Light

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Dave(at)AirCraftersLLC.co
Guest

Posted: Mon Mar 10, 2008 8:49 pm Post subject: Plane Power's Friendly Warning Light

B&C's flashing warning light is pretty  annoying, so I was glad to see Plane Power's light is a steady, happy  glow.

  

 Trouble is, it turns out, that the annoying  flash is pretty handy when you really need to see it...no equipment failures to  report, just didn't use the checklist...twice >

  

 So, does anyone have a suggestion as to how  to wire a flasher into the PP light?  Can I just use a simple automotive  flasher, or do I need something designed for less current?  I want a fairly  high (annoying) flash rate.

  

 Hope I don't need a horn.

  

 Thanks,

  

  Dave Saylor

 AirCrafters LLC

 140 Aviation Way

 Watsonville, CA 

 831-722-9141

 831-750-0284 CL

 www.AirCraftersLLC.com



    [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Tue Mar 11, 2008 6:47 am Post subject: Plane Power's Friendly Warning Light

At 09:46 PM 3/10/2008 -0700, you wrote:



 	  Quote: 	
		  B&C's flashing warning light is pretty annoying, so I was glad to see 

Plane Power's light is a steady, happy glow.


	


   If I recall correctly, the Plane Power warning

   light drives from the alternator fail output of

   the built-in regulator. While certainly better than

   no light, it's not an independent monitor of

   alternator/regulator performance.



   You might consider a separate LV Warning

   system that flashes the light.

 	  Quote: 	
		  

Trouble is, it turns out, that the annoying flash is pretty handy when you 

really need to see it...no equipment failures to report, just didn't use 

the checklist...twice >


	


   Yup, when we crafted that system the flash rate

   was set at approx 3 flashes per second. Supposedly

   this is the rate most 'irritating', i.e. attention

   getting for cockpit warning lamps.



   Bill also supplied a 6v lamp for the 14V regulators

   to increase intensity of the lamp for sunlight viewability.

 	  Quote: 	
		  

So, does anyone have a suggestion as to how to wire a flasher into the PP 

light?  Can I just use a simple automotive flasher, or do I need something 

designed for less current?  I want a fairly high (annoying) flash rate.


	


   The simplest method for adding flashing to

   an existing lamp circuit is by means of a "two-wire

   lamp flasher". There are a number of variations

   on the theme. One such circuit is illustrated here:



http://www.aeroelectric.com/Pictures/Schematics/Lamp_Flasher_1.pdf



   This circuit should be assembled with a C-Mos

   version of the ubiquitous 555 timer. In this

   case, the Intersil ICM7555 is called out.



   This flasher will deliver a symmetrical ON-OFF

   flash pattern at approx 3Hz.



   An alternative is shown at:



http://www.aeroelectric.com/Pictures/Schematics/Lamp_Flasher_2.pdf



   This is built from more generic discrete parts

   and can probably be made to do what you want to

   accomplish although its not likely to be a

   symmetrical pattern.



   Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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