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28 to 12v down-converter

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Jan 22, 2012 7:50 am Post subject: 28 to 12v down-converter

A short time ago we were discussing options for

 adding some 12-14 accessories to a 28v airplane.

 I think the author of the thread was also interested

 in having some 'cigar lighter' jacks for the odd

 appliance.



 Here's a device I ran across on eBay . . .



  http://tinyurl.com/7phxaoy 



 Of course there are bumps and potholes in the translation

 of specifications into English but for the most part, this

 device seems a likely candidate. It features both

 output voltage and current limit adjustments. This makes

 it suitable for the task and even somewhat idiot proof

 in that it's self protecting in case of a short circuit

 or overload.



 Of course, compatibility with respect to radio noise is

 unknown but I've never met a noise problem I couldn't

 whip.



 Food for thought.



 

   Bob . . .    [quote][b]

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millner(at)me.com
Guest

Posted: Sun Jan 22, 2012 12:26 pm Post subject: 28 to 12v down-converter

Seems like isolating the input ground and output ground could be     difficult in some situations... manageable to isolate the lighter     socket, but if, for instance, you're running an audio device that     you want to connect to music-in on the intercom, oh oh!

     

     Paul

     

     On 1/22/2012 7:47 AM, Robert L. Nuckolls, III wrote:      	  Quote: 	
		                A short time ago we were discussing options for

       adding some 12-14 accessories to a 28v airplane.

       I think the author of the thread was also interested

       in having some 'cigar lighter' jacks for the odd

       appliance.

       

       Here's a device I ran across on eBay . . .

       

                  http://tinyurl.com/7phxaoy 

       

       Of course there are bumps and potholes in the translation

       of specifications into English but for the most part, this

       device seems a likely candidate. It features both

       output voltage and current limit adjustments. This makes

       it suitable for the task and even somewhat idiot proof

       in that it's self protecting in case of a short circuit

       or overload.

       

       Of course, compatibility with respect to radio noise is

       unknown but I've never met a noise problem I couldn't

       whip.

       

       Food for thought.

       

       

           Bob . . .               	  Quote: 	
		   

   	
     -- 

Please note my new email address!

millner(at)me.com (millner(at)me.com)

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jan 23, 2012 4:02 pm Post subject: 28 to 12v down-converter

At 02:19 PM 1/22/2012, you wrote:

 	  Quote: 	
		  Seems like isolating the input ground and output ground could be 

difficult in some situations... manageable to isolate the lighter 

socket, but if, for instance, you're running an audio device that 

you want to connect to music-in on the intercom, oh oh!



Paul


	


   Not sure of the issue. The input and output for this

   device share common ground . . . which in this case

   would be the instrument panel avionics ground. Not sure

   why one would find it necessary to 'isolate' the lighter

   socket.

   Bob . . .

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