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DCC sound for Heljan O gauge Cl 31


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I have fitted DCC (non sound) to my O gauge steam locos but now I have a Heljan Class 31 and I would like any helpful advice on fitting DCC with sound.  Stuff like how many speakers & where to fit them; what to do with the fan circuit board; will I need resistors for the lamps etc.  I dont think I need 'stay alive' capacitors with the pick-ups and weight of a Heljan loco.


Of yes, nearly forgot, any views on Zimo chips vs Loksound.

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