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Super Modulator
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Most DCC decoders have a full wave bridge to power themselves from the track, which is sort of AC or is AC depending on your interpretation.

That means you can have at least one diode "between" the DCC decoder's ground and the bachmann circuit board ground. There is the source of ground problems, which may affect things like the chuff being fed to the decoder.

It depends on the decoder. If you have problems, you could power the chuff circuit from the decoder GND and UNREG pins (the power "output" from the DCC decoder).

Regards, Greg

p.s. it sounds like Tony has NO diode between the ground in his circuitry and the ground of the Bachmann.
 
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