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Need a device to send 12volts when all 3 green lights are l

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ceengland7(at)gmail.com
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Posted: Thu Jan 11, 2018 11:56 am Post subject: Need a device to send 12volts when all 3 green lights are l

On 1/11/2018 1:37 PM, Jeffrey W. Skiba       wrote:

     

      	  Quote: 	
		                       v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]-->         <![endif]-->   <![endif]-->                

Below is the landing gear circuit,  I need           a device or build one that can use the 12volts coming from the           gear down and locked switches and only send 12 volts to           another device[for testing a led] IF ALL 3 lights (gear down           and locked)         

          

I thought use 3 NPN transistors in series           but it seems on my test, if I supply 12 volts to the base of           the npn it still lights the led (leak though ?) with no           voltage on anything else         

          

I am using figure two of these examples         

http://www.rason.org/Projects/transwit/transwit.htm         

          



                    

          

IDEAS ?

                

     	
     Look here:

 https://www.google.com/search?q=3+input+and+gate+truth+table&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwikuoCK2NDYAhVM1oMKHUrVDZgQsAQIKA&biw=1920&bih=987#imgrc=GMoqi5mBR2TtpM:

     

     Note that a quad input AND gate might be easier to find, and you can     use it as a 3 input by tying the 4th input high.

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ceengland7(at)gmail.com
Guest

Posted: Thu Jan 11, 2018 12:03 pm Post subject: Need a device to send 12volts when all 3 green lights are l

On 1/11/2018 2:01 PM, Charlie England       wrote:

     

      	  Quote: 	
		                On 1/11/2018 1:37 PM, Jeffrey W.         Skiba wrote:

       

        	  Quote: 	
		                             v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} <![endif]-->           <![endif]-->   <![endif]-->                    

Below is the landing gear circuit,  I             need a device or build one that can use the 12volts coming             from the gear down and locked switches and only send 12             volts to another device[for testing a led] IF ALL 3 lights             (gear down and locked)           

            

I thought use 3 NPN transistors in series             but it seems on my test, if I supply 12 volts to the base of             the npn it still lights the led (leak though ?) with no             voltage on anything else           

            

I am using figure two of these examples           

http://www.rason.org/Projects/transwit/transwit.htm           

            



                        

            

IDEAS ?

                    

       	
       Look here:

       https://www.google.com/search?q=3+input+and+gate+truth+table&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwikuoCK2NDYAhVM1oMKHUrVDZgQsAQIKA&biw=1920&bih=987#imgrc=GMoqi5mBR2TtpM:

       

       Note that a quad input AND gate might be easier to find, and you       can use it as a 3 input by tying the 4th input high.

     	
     Here's one that works on 12V, & you get 2 spare devices in the     package:

     http://www.ti.com/lit/ds/symlink/cd4082b.pdf

     

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ceengland7(at)gmail.com
Guest

Posted: Fri Jan 12, 2018 11:42 am Post subject: Need a device to send 12volts when all 3 green lights are l

On 1/12/2018 1:30 PM, Robert L.       Nuckolls, III wrote:

     

      	  Quote: 	
		         At 05:03 PM 1/11/2018, you wrote:

               	  Quote: 	
		  Then I           would lose each gear           indication.  This is for an audio alert device input if the           gear is           not down and locked (all 3)

            

           From: owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)           [             mailto:owner-aeroelectric-list-server(at)matronics.com (owner-aeroelectric-list-server(at)matronics.com)] On             Behalf Of           Robert L. Nuckolls, III

           Sent: Thursday, January 11, 2018 3:04 PM

           To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)

           Subject: Re: Need a device to send           12volts when           all 3 green lights are light 	
       

         Okay, how about something like this:

       

       [img]cid:part2.43A68B38.1440408D(at)gmail.com[/img]       

       

       

                

             Bob . . .                	
     What's wrong with using a CMOS 3 input AND gate (linked in an     earlier email)?

     

     Here's one that works on 12V, & you get 2 spare devices in the     package:

     http://www.ti.com/lit/ds/symlink/cd4082b.pdf

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