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ceengland7(at)gmail.com
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 Posted: Tue Nov 12, 2019 7:20 am Post subject: LEDs light mystery |
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On Sun, Nov 10, 2019 at 11:53 AM Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | 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
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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
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kjashton(at)vnet.net
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| Posted: Tue Nov 12, 2019 7:52 am Post subject: LEDs light mystery |
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Google images for "switch dpst"
https://www.google.com/imghp?hl=en&tab=wi&ogbl
| Quote: | On Nov 12, 2019, at 10:16 AM, Charlie England <ceengland7(at)gmail.com> wrote:
On Sun, Nov 10, 2019 at 11:53 AM Carlos Trigo <trigo(at)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
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dharya
Joined: 12 Nov 2019
Posts: 1
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| Posted: Wed Nov 13, 2019 9:53 pm Post subject: Re: LEDs light mystery |
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Good information.
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