SoundTraxx SoundCar Users Guide - Manual (Page 41)

Tsunami SoundCar User’s Guide Page 37
Analog Mode
While the SoundCar is first and foremost a DCC decoder, it may be used on
a DC‑powered layout with certain limitations by enabling the analog mode
feature using the following CVs:
CV 12, Power Source Conversion
CV 29, Configuration Register 1
First, set CV 12 to 1 to enable analog mode, and then set bit 3 of CV 29 to
enable an alternate power source. Be sure to also set CV 29 for any other
desired parameters, such as the address range as discussed earlier in this
manual in “Step 2: Configuring the Decoder.”
Analog Mode Operation
When analog mode is enabled, you may control the SoundCar using an
ordinary powerpack, although operation will be a little different than when
running non‑decoder equipped units.
With the powerpack’s throttle set to 0, the SoundCar will be silent, as it has
no power. The throttle must be turned up to approximately 5 volts to provide
sufficient voltage to power‑up SoundCar’s internal circuitry. Increase the
throttle to around 7.5 volts and the SoundCar will be ready to roll.
When operating in analog mode, be careful not to exceed the SoundCar’s
input voltage rating of 27 volts. When your track exceeds 21 volts, the
SoundCar will automatically shut down and begin flashing Error Code 10 on
the lighting outputs (if connected). If you experience this, back down on the
throttle immediately.
Important: The SoundCar will work best in analog mode when using
a high‑quality, electronically regulated powerpack, preferably one that
supplies smooth, filtered DC power. Older rheostat‑style powerpacks and
pulse powerpacks will result in erratic and unreliable operation and are not
recommended for use with Tsunami DSDs. If your powerpack has a pulse
power switch, leave it in the OFF position.
Analog Mode Options
Along with CVs 12 and 29, the following two CVs control analog mode
operation:
CV 13, Analog Function Enable 1
CV 14, Analog Function Enable 2
These CVs allow you to force a function input to the ON state whenever
the SoundCar switches over to analog mode. This is most useful for turning
on lighting effects when running on a DC‑powered layout. Sound functions
may be turned on in analog mode as well, but this is less useful as they will
either run continuously or sound just once when the decoder is powered up.
Instead, use automatic sound functions (CV 197) to generate sound effects in
analog mode, as discussed earlier in this section.
Miscellaneous Features