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Zener Diode Use

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marksdavis(at)cox.net
Guest

Posted: Fri May 07, 2010 6:55 am Post subject: Zener Diode Use

Bob,



The list discussion yesterday re: powering the fuel pump thru a switch 

on the Infinity stick grip in a RV indicated that this should be done 

either with the use of a relay or a Zener diode.  I'm helping a friend 

wire his RV-7A and he wants to do this as well but only with one of the 

push buttons switches on the stick in parallel with the on-off rocker 

switch on the panel.  The pushbutton is only to be used to help during 

starting the engine.  Since space and already installed wiring make use 

of relay pretty much a non-starter, use of  a Zener diode looks like the 

best solution.  Unfortunately, I lack the knowledge and experience to 

determine the correct Zener size and just how it should be wired into 

the circuit to deal with the inrush current problem for the stick 

switch.  I'd very much appreciate any help/direction you could provide 

in this regard.



Thanks,



Mark Davis

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 07, 2010 8:35 am Post subject: Zener Diode Use

At 09:49 AM 5/7/2010, you wrote:

 	  Quote: 	
		  



Bob,



The list discussion yesterday re: powering the fuel pump thru a 

switch on the Infinity stick grip in a RV indicated that this should 

be done either with the use of a relay or a Zener diode.


	


   NO zener, relay only.



 	  Quote: 	
		     I'm helping a friend wire his RV-7A and he wants to do this as 

 well but only with one of the push buttons switches on the stick in 

 parallel with the on-off rocker switch on the panel.  The 

 pushbutton is only to be used to help during starting the 

 engine.  Since space and already installed wiring make use of relay 

 pretty much a non-starter, use of  a Zener diode looks like the best solution.


	


   Except that it is a non-solution . . .



 	  Quote: 	
		    Unfortunately, I lack the knowledge and experience to determine 

 the correct Zener size and just how it should be wired into the 

 circuit to deal with the inrush current problem for the stick 

 switch.  I'd very much appreciate any help/direction you could 

 provide in this regard.


	




   This really isn't a very good idea. Switches on the stick

   grip get more abuse than switches on the panel, yet they

   are the least robust. They add failure modes that are at

   least a nuisance but when wired to ship's systems, they

   add RISK.



   Please don't do this.



   Bob . . .

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