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Question about switches.

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poem

Joined: Feb 16 2003
Posts: 15


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Post Sun Mar 23, 2003 12:32 pm

Hi,

I was just wondering, can I use any sort of switches for controlling my LEDS and neons? I was looking at the switches for sale at Oznium and noticed "SPST" and "SPDT". What does this mean?

Thanks.
Goph

Joined: Feb 14 2003
Posts: 3822
Location: Iowa


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Post Sun Mar 23, 2003 12:42 pm

most switchs will work with no problem
Neon Mike

Joined: Feb 13 2003
Posts: 470
Location: Chelmsford, MA


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Post Sun Mar 23, 2003 12:45 pm

I think that SPDT is a light up switch and SPST is a switch that doesn't light up. I may be wrong though.
cheesy

Joined: Feb 18 2003
Posts: 752
Location: Los Angeles, CA / Seattle, WA


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Post Sun Mar 23, 2003 4:04 pm

no those abbreviations don't have anything to do with lighted or not.

SPDT = single pole, double throw
SPST = single pole, single throw

xPyT = x poles, y throws

etc
Goph

Joined: Feb 14 2003
Posts: 3822
Location: Iowa


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Post Sun Mar 23, 2003 6:11 pm

cheesy9999 wrote:
no those abbreviations don't have anything to do with lighted or not.

SPDT = single pole, double throw
SPST = single pole, single throw

xPyT = x poles, y throws

etc


I learn something new every day
poem

Joined: Feb 16 2003
Posts: 15


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Post Sun Mar 23, 2003 7:06 pm

cheesy9999 wrote:
no those abbreviations don't have anything to do with lighted or not.

SPDT = single pole, double throw
SPST = single pole, single throw

xPyT = x poles, y throws

etc


Thanks for the information! What does the "throw" mean? I'm guessing that for "double throw" the Off position is in the middle and the top and bottom are On?
cheesy

Joined: Feb 18 2003
Posts: 752
Location: Los Angeles, CA / Seattle, WA


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Post Sun Mar 23, 2003 8:21 pm

i forgot which is which, but one refers to the number of positions on the switch and one refers to the number of contacts (i.e. the number of indepent circuits you can hook up to the same switch)
PTCruzr

Joined: Feb 12 2003
Posts: 394
Location: Woodstock, GA


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Post Mon Mar 24, 2003 7:11 am

poem wrote:
cheesy9999 wrote:
no those abbreviations don't have anything to do with lighted or not.

SPDT = single pole, double throw
SPST = single pole, single throw

xPyT = x poles, y throws

etc


Thanks for the information! What does the "throw" mean? I'm guessing that for "double throw" the Off position is in the middle and the top and bottom are On?


Correct. A SPST switch only has one ON position but a SPDT switch has 2, so if you connect 2 different neons (one to each ON connection) only one neon will light when you "throw" (toggle) the switch to one ON position and the other neon will light in the other ON position.
Most people use SPST switches and connect multiple neons to the single ON position so they will all light up when you "throw" the switch.
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