pete007 Posted April 25, 2013 Share Posted April 25, 2013 Hi Guys, I have several diesel Locos with the domino headcodes, these look fine when not lit but when lit the whole black panel turns to the yellow light colour. I was wondering if there is a setting on the decoder which would let me dim the lights so would not be as bright and would bring to brightness down to a acceptable level. Any help welcome and thanks in advance. Peter Link to comment Share on other sites More sharing options...
Fishmanoz Posted April 25, 2013 Share Posted April 25, 2013 Pete, no decoder setting for that which I am aware of, decoder functions are either on or off. Doesn't mean it's not possible though - what you would need is a bigger series resistor in circuit for the LED, assuming it is a modern loco using LEDs. These days though, it may mean removing the existing resistor from a printed circuit board and replacing. You'd need to check the specifics of your locos for that. Link to comment Share on other sites More sharing options...
poliss Posted April 25, 2013 Share Posted April 25, 2013 Check Rule 17 Fishy. Link to comment Share on other sites More sharing options...
Fishmanoz Posted April 25, 2013 Share Posted April 25, 2013 Of? Where I come from, Rule 17 is conduct on court (Squash). Link to comment Share on other sites More sharing options...
poliss Posted April 25, 2013 Share Posted April 25, 2013 Rule 17 is a prototype railroad rule specifying conditions for dimming lights on locomotives. Many DCC decoders support this dimming to a greater or lesser degree. Link to comment Share on other sites More sharing options...
Fishmanoz Posted April 25, 2013 Share Posted April 25, 2013 Thanks, learn something new every day. So it must reduce the function voltage? How do you adjust it? Link to comment Share on other sites More sharing options...
poliss Posted April 25, 2013 Share Posted April 25, 2013 Depends on the decoder. See this article on the NMRA website. http://www.nmra.org/member/sites/default/files/SR201104_Rule17.pdf Link to comment Share on other sites More sharing options...
Fishmanoz Posted April 26, 2013 Share Posted April 26, 2013 Good one poliss. Understand what that is about. Unfortunately, it is manufacturer specific, not including Hornby, and requires the decoder to include a 5V supply for the dim lights, the use of function mapping and user defined CVs. So unless you want to go for those specific decoder types, or the capability is in your sound decoder, the only option will be the higher series resistor I suggested above. Link to comment Share on other sites More sharing options...
Fishmanoz Posted April 26, 2013 Share Posted April 26, 2013 That's manufacturer defined CVs, not user defined. When I got your reply, I had already started to see what I could find in the CV standards at http://www.dccwiki.com/Configuration_variable#Mode_Control_.28CV29.29 but it is not obvious at first reading, especially due to the use of CVs 43-64 and above 107, and the interface between these and the function outputs. Link to comment Share on other sites More sharing options...
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