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BENT: I did a little research and found dcc controllers works with either DC or AC power supplies. I use a 16VAC MRC powerpack that came with my Prodegy DCC. That may be why my headlight is AC but yours is appears as dc if you are using a dc powerpack. I gather the decoders use "switches" to turn on-off headlight suppling track power to them. I am goint to do an experiment when I get time and swap in a filtered dc power pack and see. I am also going to note if it changes the way no-dcc locos sound.
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