Function output question

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4 replies

rrinker

Member since
February 2002
From: Reading, PA
30,002 posts

Posted by rrinker on Thursday, July 7, 2005 9:53 PM

The Blue wire is +, the individual function lines (white, yellow, purple, etc) are -.

Modeling the Reading Railroad in the 1950's

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Blind Bruce

Member since
January 2005
From: Winnipeg Canada
1,637 posts

Posted by Blind Bruce on Thursday, July 7, 2005 3:59 PM

What is the polairity of he DC?
BB

Bruce in the Peg

selector

Member since
February 2005
From: Vancouver Island, BC
23,330 posts

Posted by selector on Thursday, July 7, 2005 11:35 AM

I think that is the most comprehensive and succinct explanation I've seen yet! Good job, cacole.

cacole

Member since
July 2003
From: Sierra Vista, Arizona
13,757 posts

Posted by cacole on Thursday, July 7, 2005 10:26 AM

They are DC. All decoders convert their function outputs to DC because they are using the same rectified current that is used for the motor.

DCC equipped layouts are operating on DC current, with a square-wave AC command signal superimposed over the DC current. The decoder strips the AC command signal out of the current and feeds DC to the motor and function outputs.

Blind Bruce

Member since
January 2005
From: Winnipeg Canada
1,637 posts

Function output question

Posted by Blind Bruce on Thursday, July 7, 2005 10:11 AM

Is the function outputs on decoders AC or DC? It is important so I can wire LED headlights.
BB

Bruce in the Peg

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