Another Controller Thought...
After bumping up sometime ago from the standard gray Marklin transformer
to an MRC 2800 (the older 10Vdc model) as well as the MRC 1300, I've
been much happier with the amount of useable transformer steps and slow
speed performance all of my locos. Having a Relco installed has helped
quite a bit as well.
A friend of mine has been using the British Trax controller:
From what he's told me the slow speed performance is amazing. The output
of this Trax unit is 12Vdc. I believe this unit functions not entirely
unlike DCC in that full power is applied to the motor in a series of
short bursts, rather than a variable percentage of power being applied
If this much is accurate, the possible problem (I would guess) is that
these 12Vdc bursts are still a bit too high for a Z motor, which would
be happier receiving 8Vdc or under, most likely well under for
prototypical operation. I think that bursts of say, 2 - 4Vdc would not
cause the heating of the motor that the full 12Vdc bursts would cause.
The reason I bring this up is that I've contacted the owner of the
company and asked if it would be possible for him to modify his
controllers so their maximum output is 8Vdc, rather than the current
Two other thoughts on this.... since I believe this controller has a
similar operating principal to DCC (at least as far as the power to the
motor), I came across this circuit:
This is an DCC anti-buzzing circuit. Might this be incorporated
post-controller / pre-rails? I bring this up as I've heard that some DCC
(and possibly this Trax controller) output designs can cause a buzzing
noise at slower speeds. Also, this Trax controller features Back EMF
circuitry which I definitely see as a plus.
I just thought I'd jot this note off as I wait to hear back from the
owner of Trax, and the feasibility of him modifying his controllers.