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Any Ray Allen LED Dimming Circuit ideas?

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vhimsl(at)roadrunner.com
Guest

Posted: Thu Mar 27, 2008 5:02 pm Post subject: Any Ray Allen LED Dimming Circuit ideas?

Hello,  

   

Panel is all wired up, just some fine tuning. One item is that the Ray Allen LED trim indicators are too bright when switched to ½ brightness.  

   

I have scanned the net for a way to convert them to a linear dimming range but have found nothing. I am at point of installing a switch to turn them off except when needed.  

   

I am hoping someone has a more elegant (read cheap) solution. They’re already mounted in the panel so chucking them is not an option.  

   

Thanks!  

Vince H.  

Idaho – RV-8 VSB (Very Slow Built) Finish  

   

   

        [quote][b]

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dennis.glaeser(at)eds.com
Guest

Posted: Fri Mar 28, 2008 6:44 am Post subject: Any Ray Allen LED Dimming Circuit ideas?

The LED units have a lead which dims them when connected to 12v.  It's

an on-off type of thing as far as I know, no way to use a dimming

circuit.  I'm using the Perihelion Dimmer which has a switched output as

well as a dimmed output. I connected the Trim indicators dimmer wire to

the switched side, so when I turn on my interior lights, the trim

indicators dim.



Dennis Glaeser

RV7A - first flight planned for tomorrow!



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

Hello,



Panel is all wired up, just some fine tuning. One item is that the Ray 

Allen

LED trim indicators are too bright when switched to =BD brightness.



I have scanned the net for a way to convert them to a linear dimming 

range

but have found nothing. I am at point of installing a switch to turn 

them

off except when needed.



I am hoping someone has a more elegant (read cheap) solution. They=92re

already mounted in the panel so chucking them is not an option.



Thanks!



Vince H.

Idaho ' RV-8 VSB (Very Slow Built) Finish

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Eric M. Jones

Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts

Posted: Mon Mar 31, 2008 11:10 am Post subject: Re: Any Ray Allen LED Dimming Circuit ideas?

 	  Quote: 	
		  Panel is all wired up, just some fine tuning. One item is that the Ray Allen LED trim indicators are too bright when switched to ? brightness. 



I have scanned the net for a way to convert them to a linear dimming range but have found nothing. I am at point of installing a switch to turn them off except when needed. Vince H. Idaho â€“ RV-8 	




The LM3914 Bar Graph Driver chip used by RAC/MAC is a clever little device. But it has its limitations too. Usually people don't complain about the bright "Day" output, since most airplanes have too much sun in them anyway. But if you want to dim the bright output, you can add a 28K or so (a 50k 10-turn pot might be nice) between the white lead and +, instead of being left open. 



The "Night" output is connected to + directly, but there is a design limitation to be understood...since the driver for the LEDs are in the chip, there is a limit to the dynamic range that can be programmed. 10 to 1 is all you can get by ordinary means.  The "Night" output brightness is about at the bottom now, so you can't get more dim.



"A witty saying proves nothing"

     --Voltaire

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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net

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