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Dimmer for 5 volt lights

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dsvs(at)ca.rr.com
Guest

Posted: Mon Apr 09, 2007 5:17 pm Post subject: Dimmer for 5 volt lights

I am looking gor a recopmendation on purchase of a dimmer system for 5 volt

panel lights.  My AC has a 14 volt system and the people who are building an

ecgraved panel for me recomended 5 volt lights vs 14 volt because they last

considerably longer.So, does anyone know of a good dimmer with a masx output

of 5 volts with 14 volts in?  Thanks.  Don

nuckollsr(at)cox.net
Guest

Posted: Mon Apr 09, 2007 8:41 pm Post subject: Dimmer for 5 volt lights

At 06:17 PM 4/9/2007 -0700, you wrote:



 	  Quote: 	
		  



I am looking gor a recopmendation on purchase of a dimmer system for 5 volt

panel lights.  My AC has a 14 volt system and the people who are building an

ecgraved panel for me recomended 5 volt lights vs 14 volt because they last

considerably longer.So, does anyone know of a good dimmer with a masx output

of 5 volts with 14 volts in?  Thanks.  Don


	




    It just so happens that I'm building one for a customer. Details

    are not finalized yet but it looks like the critter will be rated

    at 0.7 to 5.0 volts output at up to 4A. It will be packaged in

    the same enclosure as shown on page 2 of



    http://www.aeroelectric.com/Catalog/AEC/9011/9011-700-1C.pdf



    I'll know more in about a week. Prototyping parts are expected

    here later this week but I won't be able to play with them

    until next week.



    I think the price will be something on the order of $55

    and will include the externally mounted dimmer control

    pot.



    The part number will be AEC9033-1.



    Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

dsvs(at)ca.rr.com
Guest

Posted: Mon Apr 09, 2007 9:23 pm Post subject: Dimmer for 5 volt lights

Bob,

I will take one. I need to know the size hole that the pot will require in

the panel so that I can proceed with that part of the project. If you can

please send me that information and please let me know when the dimmer is

available.  Thanks. Don



--

rjquillin(at)gmail.com
Guest

Posted: Mon Apr 09, 2007 9:43 pm Post subject: Dimmer for 5 volt lights

At 22:40 4/9/2007, you wrote:

 	  Quote: 	
		  I think the price will be something on the order of $55

    and will include the externally mounted dimmer control

    pot.



    The part number will be AEC9033-1.



    Bob . . .


	


Any chance you could make it track an existing 14V dimmer circuit as an option?



Ron Q.

nuckollsr(at)cox.net
Guest

Posted: Tue Apr 10, 2007 4:21 am Post subject: Dimmer for 5 volt lights

At 10:42 PM 4/9/2007 -0700, you wrote:



 	  Quote: 	
		  



At 22:40 4/9/2007, you wrote:

>I think the price will be something on the order of $55

>    and will include the externally mounted dimmer control

>    pot.

>

>    The part number will be AEC9033-1.

>

>    Bob . . .



Any chance you could make it track an existing 14V dimmer circuit as an 

option?



Ron Q.

--

10:59 PM



-- incoming mail is certified Virus Free.

Checked by AVG.


	




        Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

nuckollsr(at)cox.net
Guest

Posted: Tue Apr 10, 2007 4:24 am Post subject: Dimmer for 5 volt lights

At 10:42 PM 4/9/2007 -0700, you wrote:



 	  Quote: 	
		  



At 22:40 4/9/2007, you wrote:

>I think the price will be something on the order of $55

>    and will include the externally mounted dimmer control

>    pot.

>

>    The part number will be AEC9033-1.

>

>    Bob . . .



Any chance you could make it track an existing 14V dimmer circuit as an 

option?



Ron Q.


	


   Yeah, that can be done but given that 5v lighting (as

   is most incandescent panel lighting) is going the way

   of the buggy whip, there's virtually no way I would

   recover the cost of development. I don't expect to sell

   more than a half dozen of the 9033-1 as a lighting dimmer.



   The AEC9033-2 will be a power supply to eliminate batteries

   in a variety of hand-held devices that run from 2 or 3

   cells. I might sell a few more of those.



   Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

klehman(at)albedo.net
Guest

Posted: Tue Apr 10, 2007 6:10 am Post subject: Dimmer for 5 volt lights

Why 5 volts?  Sure, in theory the filaments are thicker and more 

reliable in high vibration situations but is it meaningful for 12 volt 

vehicles. Apparently it is already increasing complexity and costs.

How many bulbs here? Would it make sense to put a couple of strings of 3 

in series for 14.4 volts operation? Can they be replaced with 12 volt 

bulbs? LED's?

Ken

Robert L. Nuckolls, III wrote:

 	  Quote: 	

 <nuckollsr(at)cox.net>

 At 10:42 PM 4/9/2007 -0700, you wrote:

> 

> <rjquillin(at)gmail.com>

>

> At 22:40 4/9/2007, you wrote:

>

>> I think the price will be something on the order of $55

>>    and will include the externally mounted dimmer control

>>    pot.

>>

>>    The part number will be AEC9033-1.

>>

>>    Bob . . .

> Any chance you could make it track an existing 14V dimmer circuit as 

> an option?

>

> Ron Q.

   Yeah, that can be done but given that 5v lighting (as

   is most incandescent panel lighting) is going the way

   of the buggy whip, there's virtually no way I would

   recover the cost of development. I don't expect to sell

   more than a half dozen of the 9033-1 as a lighting dimmer.

   The AEC9033-2 will be a power supply to eliminate batteries

   in a variety of hand-held devices that run from 2 or 3

   cells. I might sell a few more of those.

   Bob . . .

dennis.glaeser(at)eds.com
Guest

Posted: Tue Apr 10, 2007 7:53 am Post subject: Dimmer for 5 volt lights

Eric Jones sells a dimmer that can be configured for whatever min and

max voltage range you desire:

http://www.periheliondesign.com/egpavr.htm



	Dennis Glaeser



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

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

From:      Don Vs

Date:      Mon Apr 09 - 6:17 PM 



I am looking gor a recopmendation on purchase of a dimmer system for 5

volt

panel lights.  My AC has a 14 volt system and the people who are

building an

ecgraved panel for me recomended 5 volt lights vs 14 volt because they

last

considerably longer.So, does anyone know of a good dimmer with a masx

output

of 5 volts with 14 volts in?  Thanks.  Don

nuckollsr(at)cox.net
Guest

Posted: Tue Apr 10, 2007 9:24 am Post subject: Dimmer for 5 volt lights

At 11:51 AM 4/10/2007 -0400, you wrote:



 	  Quote: 	
		  

<dennis.glaeser(at)eds.com>



Eric Jones sells a dimmer that can be configured for whatever min and

max voltage range you desire:

http://www.periheliondesign.com/egpavr.htm


	


   This product uses the LM317 linear adjustable regulator

   to drop the incoming voltage to the desired level and hold

   it by means of a feedback loops that provides active

   regulation. When set up to provide say 5 volts at 1 amp

   of output it must dispose of 9 volts x 1 amp or 9 watts

   of power that will manifest itself as heating in the

   LM317.



   The heat sink provided for this device is not adequate to

   shed 9w of heat and keep the LM317 happy.   The 1.5A

   rating of this product depends on a max bright

   load of 1.5A falling to some more tolerable value as

   the brightness is turned down. There's a figure in the

   'Connection that speaks to characteristics of incandescent

   lamps. It shows that at 50% of rated voltage, an incandescent

   lamp still draws about 70% of rated current. So turning intensity

   down to 7 volts on our 1.5A hypothetical offers a load

   of 1.05 Amps. The 7 volt drop at 1.05 amps still asks

   the heatsink to cool the LM317 with a 7.2 watt heat

   rejection task. It's still too small.



   5 Volt, long lived imbedded lamps tend to have beefy filaments . . . the

   lamps are generally rated at 100 mA or more each. It takes

   only 10 lamps in the string to provide a 1A load to a lighting

   dimmer.



   The pure linear dimmers such as the one cited above and

   those offered by B&C are not well suited for controlling

   5v lighting systems because of their inefficiencies. Note

   also that the B&C 1.5A regulator comes with an LM317

   chip . . . and it's on a much bigger heatsink to insure

   regulator performance at full rated current at any output

   voltage setting and max expected local ambient temperature.



   The AEC9033 series devices are switchmode regulators that

   offer about 80% minimum efficiency over the full range of

   voltage settings and loads. This means that with the output

   set for say 5V on a 4A load (20 Watts out) the heat rejected

   by the assembly is under 5 watts.



   Depending on heat rejection studies at the prototype stage

   -AND- radio noise studies the output of the 9033 series

   devices may have to be de-rated . . . but in no case do

   I expect it to be less than 2.5 amps.



   Bob . . .

nuckollsr(at)cox.net
Guest

Posted: Tue Apr 10, 2007 10:30 am Post subject: Dimmer for 5 volt lights

At 10:05 AM 4/10/2007 -0400, you wrote:



 	  Quote: 	
		  



Why 5 volts?  Sure, in theory the filaments are thicker and more reliable 

in high vibration situations but is it meaningful for 12 volt vehicles. 

Apparently it is already increasing complexity and costs.



How many bulbs here? Would it make sense to put a couple of strings of 3 

in series for 14.4 volts operation? Can they be replaced with 12 volt 

bulbs? LED's?



Ken


	


   Imbedded lamps in back lit panels for aircraft use

   wire lead devices held in place with epoxy. VERY

   difficult to change out.  The practice of choice for

   this technology when it was new (about 1965) was

   to use the longest life lamps we could put our hands

   on. See:



   http://tinyurl.com/22268w



   Here's an excerpt from the lamps listing in Allied's

   catalog. Note the style 13 and 15 lamps are all small,

   wire leaded devices. Note the exemplary rated lives

   for some of these lamps . . . 60,000 hours!!!



   Today, I'd sure be looking for ways to use leds in

   this application, check out the price of those lamps.



   The 5v imbedded technology was a really whoopy-do thing

   about 25 years ago and there are still folks who make

   a good living fabricating spares for thousands of aircraft

   that use it. I'd sure think twice before I used it in

   a new design.



   Bob.  . .

dsvs(at)ca.rr.com
Guest

Posted: Wed Apr 11, 2007 4:47 pm Post subject: Dimmer for 5 volt lights

Bob,

Is it possible to control multiple copies of this dimmer from the same pot?



--

nuckollsr(at)cox.net
Guest

Posted: Wed Apr 11, 2007 5:42 pm Post subject: Dimmer for 5 volt lights

At 05:47 PM 4/11/2007 -0700, you wrote:



 	  Quote: 	
		  



Bob,

Is it possible to control multiple copies of this dimmer from the same pot?


	


   I'd have to think about that a bit. I think so but I'll need

   to noodle through the physics of the control loop. Why multiples

   instead of one BIG one?



   Bob . . .

dsvs(at)ca.rr.com
Guest

Posted: Wed Apr 11, 2007 5:56 pm Post subject: Dimmer for 5 volt lights

I might need more amp capability, so I thought multiple dimmers would be the

way to go,  Are you going to make this dimmer available with a higher

capability? or did I not catch your meaning of a "one big one"?



--

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