Matronics Email Lists :: View topic - HLMP-2685 multi-LEDs off LR3C

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

HLMP-2685 multi-LEDs off LR3C

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

james(at)etravel.org
Guest

Posted: Tue Apr 06, 2010 4:35 pm Post subject: HLMP-2685 multi-LEDs off LR3C

Gents,



I'm putting together a small annunciator panel with a number of

HLMP-2685 (and similar) LED packages on it.  Each one has 8 discrete

LEDs, which can be wired in series or parallel to work together. The

HLMP-2685 is red, and there are green, yellow, etc., available too.



http://parts.digikey.com/1/parts/681506-led-lt-bar-hi-eff-red-8led-dip-hlmp2685.html



I'd like to hook one of these to the LR3C regulator instead of the

supplied filament lamp, so that it can go into the annunciator panel

too.



I've been trying to trace a schematic of Bob's, which I'm sure I've

seen, of how to use an LED instead of a filament lamp with the LR3C,

as a starting point.  I can't find it, and the resistor values would

be different in any case, so can anyone throw any light on to how to

use one of these 8-LED devices with the LR3C?



For the other uses of this HLMP-2685, e.g fuel pump, flaps, timer,

etc, I'd put four of the LEDs in series, paralleled with the other

four, with a 220ohm resistor, to run from a nominal 12V supply.



Any advice would be greatly appreciated.  Many thanks in anticipation.



James

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

nuckolls.bob(at)aeroelect
Guest

Posted: Thu Apr 08, 2010 5:05 am Post subject: HLMP-2685 multi-LEDs off LR3C

 	  Quote: 	
		  

http://parts.digikey.com/1/parts/681506-led-lt-bar-hi-eff-red-8led-dip-hlmp2685.html



I'd like to hook one of these to the LR3C regulator instead of the

supplied filament lamp, so that it can go into the annunciator panel

too.



I've been trying to trace a schematic of Bob's, which I'm sure I've

seen, of how to use an LED instead of a filament lamp with the LR3C,

as a starting point.  I can't find it, and the resistor values would

be different in any case, so can anyone throw any light on to how to

use one of these 8-LED devices with the LR3C?


	


    The schematic I published is at:



http://aeroelectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg



    Your application will take some experimentation.

    You can try paralleling all the LEDs and seeing how

    well you can excite the array and still have uniform

    illumination. You may find that you need to treat

    them as separate LEDs.



    Just be aware that LR3 lamp driver is never completely

    "OFF". The off current is too low to get any light

    from a bulb but it will cause an LED to glow at a

    reduced intensity. Hence the paralleling resistor to

    get the LED to mimic a lamp more closely.



    Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

james(at)etravel.org
Guest

Posted: Sun Apr 11, 2010 3:30 am Post subject: HLMP-2685 multi-LEDs off LR3C

Bob,



That's great, thank you.  It gives me a good place from which to experiment.



James



On Thu, Apr 8, 2010 at 2:04 PM, Robert L. Nuckolls, III

<nuckolls.bob(at)aeroelectric.com> wrote:

 	  Quote: 	
		   

 <nuckolls.bob(at)aeroelectric.com>

>

>

> http://parts.digikey.com/1/parts/681506-led-lt-bar-hi-eff-red-8led-dip-hlmp2685.html

>

> I'd like to hook one of these to the LR3C regulator instead of the

> supplied filament lamp, so that it can go into the annunciator panel

> too.

>

> I've been trying to trace a schematic of Bob's, which I'm sure I've

> seen, of how to use an LED instead of a filament lamp with the LR3C,

> as a starting point.  I can't find it, and the resistor values would

> be different in any case, so can anyone throw any light on to how to

> use one of these 8-LED devices with the LR3C?



   The schematic I published is at:



 http://aeroelectric.com/Pictures/Schematics/LR3_LV_Led_1.jpg



   Your application will take some experimentation.

   You can try paralleling all the LEDs and seeing how

   well you can excite the array and still have uniform

   illumination. You may find that you need to treat

   them as separate LEDs.



   Just be aware that LR3 lamp driver is never completely

   "OFF". The off current is too low to get any light

   from a bulb but it will cause an LED to glow at a

   reduced intensity. Hence the paralleling resistor to

   get the LED to mimic a lamp more closely.



   Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum