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Dimmers driving displays

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millner(at)me.com
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Posted: Thu Apr 02, 2015 7:58 am Post subject: Dimmers driving displays

 	  Quote: 	
		  > What's the lowest parts count solution to this design goal


	


A switch on the back of the dimmer pot... when you go full dim, it switches

bus voltage to the electronic displays.



Can't take credit; Cessna thought of it first! 



Paul

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nuckolls.bob(at)aeroelect
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Posted: Thu Apr 02, 2015 1:25 pm Post subject: Dimmers driving displays

At 10:57 2015-04-02, you wrote:

 	  Quote: 	
		  



 >> What's the lowest parts count solution to this design goal



A switch on the back of the dimmer pot... when you go full dim, it switches

bus voltage to the electronic displays.



Can't take credit; Cessna thought of it first!


	


   Ahhh . . . that recalls the switch on the

   back of the dimmer pot in some Pipers

   that automatically turned on position lights

   when the panel lights were brought up.



   Nice take. The switchs at the CCW end of

   pots tend to go open at max travel, so

   you still have to add some electro-beans

   to invert the sense.



   Bob . . .

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fly4grins(at)gmail.com
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Posted: Fri Apr 03, 2015 5:45 am Post subject: Dimmers driving displays

 	  Quote: 	
		  

 

 How are others solving this problem? I am trying to avoid having 17 dimmer controls.

 

 Thoughts?

 

 Andy

	




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

IIRC, the incorporated switch is SPDT, so the OFF function can be made an ON function.  

Check with Eric;  I'm surprised he's not chimed in yet...



  [quote][b]

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yellowduckduo(at)gmail.co
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Posted: Fri Apr 03, 2015 7:13 am Post subject: Dimmers driving displays

Trutrak did this automatically as my ADI goes full bright when the 

pre-existing dimmer circuit is off which seems to be what you want in 

order to keep the post lights off during the day.



There are ways to trigger a 12 volt relay when the dimmer voltage is 

minimum.  I'd probably look at using an even cheaper Mosfet transistor 

instead of the relay but a relay is simple.  You could feed the coil 

with a comparator circuit that turns on at any dimmer voltage you wish.  

An ic comparator (or any op amp) could do that with a couple of 

resistors added.  Or a transistor and zener diode setup somewhat similar 

to what triggers the OVM module would also do it.  A couple of dollars 

plus a relay and shipping if you don't have parts on hand but packaging 

it is more awkward than just adding another switch.  Stick it in a 

plastic pill box and tie it to existing wires or something would work.



I actually like lots of dimmer controls to allow precise harmonizing 

various intensities. Some commercial aircraft do indeed have 17 dimmer 

controls. Switches are dead simple to troubleshoot and maintain.



Ken



On 03/04/2015 9:42 AM, GLEN MATEJCEK wrote:

 	  Quote: 	
		  

     How are others solving this problem? I am trying to avoid having

     17 dimmer controls.



     Thoughts?



     Andy

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



 IIRC, the incorporated switch is SPDT, so the OFF function can be made 

 an ON function.



 Check with Eric;  I'm surprised he's not chimed in yet...

 *

 *

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