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

 
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PostPosted: Thu Jan 11, 2018 11:56 am    Post subject: Need a device to send 12volts when all 3 green lights are l Reply with 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.
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PostPosted: Thu Jan 11, 2018 12:03 pm    Post subject: Need a device to send 12volts when all 3 green lights are l Reply with quote

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

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
Virus-free. www.avast.com [url=#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2] [/url]


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