--- In [email protected], JCR <vannessco@...> wrote:
>
> Bob
>
> Amen to heat sinks. The large lead weight "seems to be doing a good job" of
> heat dissipation. But, admitted the unit does not have much running time. It
> seems best to raise the decoder up a bit in the crevice so the heat
> dissipates from all sides as well. However the large lower tech motor does
> worry me. Soundtraxx has stated to me that the max amperage is 2 "and a
> scootch". I did two things to give myself some leeway. First I decreased the
> rear weight to balance with the weight on the front drivers (or better said
> in the front boiler and mechanism added together.) The excessive rear weight
> as delivered was in my view putting all the weight on the rear, canceling the
> front, and causing excessive motor draw and coupling wear. Secondly I did not
> wire the tender light to the decoder as these were 12-14 volt 50-60 milliamp
> bulbs as delivered. The front light was replaced with a 1.5 volt 15 milliamp
> bulb. I have a DCC ammeter on order and will report amperage draw later.
> Based on DC wiring the highest I reached was 0.6 amps.
> Thank you
> Chris
=====================================================================
Chris:
If the Tsunami was placed on the metal weight with the heat sink side down
(that would be the flat side of the decoder), the metal weight should actually
help cooling because it will act as a larger heat sink.
Sounds like you tried to balance the weight on your drivers. I did the same
thing too with my Mikado which why I only milled off enough metal to accomodate
the bass reflex speaker in the boiler. I came pretty close, but if I follow
your example and mill more material out fo the weight to fit the decoder, I
will have to figure out where to locate additional weight to maintain the
balance.
I replaced both bulbs (front and rear) on my Mike with 1.5 volt 30 ma bulbs and
used 360 ohm - 1/2 watt dropping resistors. However, at the next major serving
of this engine, I am going to install golden white LEDs with 1K ohm resistors.
Thanks for sharing your work.
John Gibson
Rocklin, CA
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