Today's Message Index:
----------------------
1. 07:20 AM - Re: LEDs light mystery (Charlie England)
2. 07:52 AM - Re: LEDs light mystery (Kent or Jackie Ashton)
3. 08:15 AM - LEDs light mystery (Option 2) (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: LEDs light mystery |
On Sun, Nov 10, 2019 at 11:53 AM Carlos Trigo <trigo@mail.telepac.pt> wrote:
> Charlie
>
> A DPDT would not suit my need, it has to be a DPST.
> And I am not finding a DPST - N.O., which one is it?
>
> Carlos
>
>
> Carlos,
I thought about my previous answer ('a DPDT is a DPST if you ignore 2
terminals') and realized that it might not have made sense if you don't
have an electrical circuits background with the switches. It's a true
statement, but might need more explanation.
A DPST switch controls 2 circuits, and either opens or closes both at the
same time, as you know.
A DPDT can do the same task. The 'DT' just means that the 'common' terminal
will be connected to (for example) terminal one, or terminal two, depending
on the position of the switch. Take a look at the tutorial below, and
scroll down to the DPDT description. If you make your connections from the
EFIS to '1P' and the LED to '2P', and connect both the '1T' terminals to
ground, leaving both '2T' terminals with no connection, the switch
functions as a DPST switch.
Hope that helps,
Charlie
https://learn.sparkfun.com/tutorials/switch-basics/all
Message 2
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| Subject: | Re: LEDs light mystery |
Google images for "switch dpst"
https://www.google.com/imghp?hl=en&tab=wi&ogbl
> On Nov 12, 2019, at 10:16 AM, Charlie England <ceengland7@gmail.com> wrote:
>
>
>
> On Sun, Nov 10, 2019 at 11:53 AM Carlos Trigo <trigo@mail.telepac.pt> wrote:
> Charlie
>
> A DPDT would not suit my need, it has to be a DPST.
> And I am not finding a DPST - N.O., which one is it?
>
> Carlos
>
>>
> Carlos,
> I thought about my previous answer ('a DPDT is a DPST if you ignore 2 terminals')
and realized that it might not have made sense if you don't have an electrical
circuits background with the switches. It's a true statement, but might
need more explanation.
> A DPST switch controls 2 circuits, and either opens or closes both at the same
time, as you know.
>
> A DPDT can do the same task. The 'DT' just means that the 'common' terminal will
be connected to (for example) terminal one, or terminal two, depending on
the position of the switch. Take a look at the tutorial below, and scroll down
to the DPDT description. If you make your connections from the EFIS to '1P' and
the LED to '2P', and connect both the '1T' terminals to ground, leaving both
'2T' terminals with no connection, the switch functions as a DPST switch.
>
> Hope that helps,
>
> Charlie
>
> https://learn.sparkfun.com/tutorials/switch-basics/all
Message 3
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| Subject: | LEDs light mystery (Option 2) |
At 12:14 PM 11/10/2019, you wrote:
>On 11/10/2019 11:44 AM, Carlos Trigo wrote:
>>Charlie=C2
>>
>>A DPDT would not suit my need, it has to be a DPST.
>>And I am not finding a DPST - N.O., which one is it?
>>
>>Carlos
Option 2. See
http://www.aeroelectric.com/PPS/Lighting/Baggage%20Door%20Lite.pdf
This configuration eliminates the 'dim led'
condition while satisfying the EFIS input
requirement using a single switch.
For general rundown on switch nomenclature
and schematic symbols, see chapter 11 in:
http://www.aeroelectric.com/Book/AEC_R12A.pdf
Bob . . .
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