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Chief cook & bottle washer
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I've done 3 steam and a diesel for a friend and they weren't much trouble. You have to make sure that the decoder doesn't get any supply from the chassis, or anywhere else except the red and black wire. The Digihats isolate the motor brushes from the chassis, but you have to check every inch of the way with a multi meter to make sure there's no chance of contact.

Having a lathe, I made the Digihats myself, which saved my mate a few bob, as he's got some more to do yet.

We used Digitrax DZ125 decoders, which were the smallest we could find in his price range. Personally, I'd have gone for Zimo, but you'll get other views.
 
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