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                                                                                         APPLICATION NOTE
New Dimensions in Digital Sound Technology

                                                  Bachmann 2-6-6-2
                                     Digital Sound Decoder Installation Notes
This application note describes the installation of a DSD-090LC Digital Sound Decoder into a Bachmann 2-6-6-2 Locomotive. All of
the components are installed inside the tender. No major mechanical modifications are needed and the entire installation should
only take a few hours.

A 1” speaker is installed under the coal load. The
sound decoder is wired to a standard 8-pin NMRA
connector and plugs into the “DCC ready” connector
in the tender.

Bill of Materials
Stock No.         Description

821102            DSD-090LC Digital Sound Decoder
810054            1” Speaker
810119            1” Speaker Gasket (Pack of 4)
810012            Two-pin Microconnector
810037            Heat-Shrink Tubing
810123            NMRA-type 8-Pin Header (pack of 4)

Tools You Will Need                           ■   Wire Strippers
     ■   Miniature Screwdriver Set            ■   25W Solder Iron
     ■   X-acto Knife with #11 Blade          ■   Rosin Core Solder
     ■   1-1/2” x 3” x 0.040” Styrene Sheet   ■   Heat gun
     ■   Flat Black Paint                     ■   Tweezers
     ■   RTV or Silicone Sealant              ■   Double-sided Foam Tape
     ■   1/4” Drill                           ■   Pin Vise or Electric Drill
     ■   7/8” Forstner Bit or Spade Bit       ■   #65 Drill Bit
     ■   Miniature Files                                                       Photo 1
     ■   Wire Cutters

1.   Remove the tender shell by unscrewing the small phillips head
     screw on the bottom frame center, near the back of the front truck
     (Photo 1). Set this screw aside. Slide the front of the tender shell
     forward until you can slide the two tabs at the back of the tender
     out of their slots.

2.   The coal load is a separate piece that can be removed by sliding a
     knife blade under the back of the load and then gently prying the
     plastic part loose (Photo 2).

3.   With your X-acto knife, cut out a piece of 0.040" sheet styrene that
     measures 0.60" x 0.25". Paint this a flat black and glue over the
                                                                               Photo 2
     opening at the bottom of the coal bunker using           Gluing the template to the sheet styrene first
     RTV. Photo 3 shows test-fitting the piece of              makes the measuring and cutting easier. Use
     styrene before painting.                                 the spade bit to drill the large 7/8” hole (Photo
                                                              5). If you do not have access to a Forstner or
                                                              spade bit, you can drill several smaller holes
                                                              and trim the excess away with a hobby knife.

Photo 3
                                                         Photo 5
4.   Drill a 1/4" hole in the back of the coal bunker
     for the speaker wires and connector. (Photo4)            Cut and trim the outer edges. Test fit the plate
     Since this piece of plastic is simply glued in           in the tender. File the rear edge at a slight
     place, it is a good idea to make a small pilot           angle to match the back of the bunker for a
     hole first so as not to 'snag' the plastic. Drill         perfect fit.
     from the bottom of the tender shell to avoid
     the screw boss.                                     6.   Cut approximately 2.75" from each of the
                                                              purple wires on the DSD-090LC. This should
                                                              leave roughly an inch of wire still attached to
                                                              the decoder. Strip 1/8" of insulation from both
                                                              ends of the two 2.75" lengths of wire. Tin the
                                                              ends and set aside.

                                                         7.   Trim the leads of the 33 uF, 16V bipolar
                                                              capacitor to 1/2” (Photo 6).

Photo 4

5.   Create a speaker mounting plate from 0.040”
     styrene using the template provided.
                                                         Photo 6

             Speaker Plate - 0.040" Styrene
                                                         8.   Solder one of the 2.75” purple wires you cut
                                                              in Step 6 to one lead of the capacitor. Solder
                                                              the other capacitor lead to one of the speaker
                                                              terminals, putting a small piece of tape under
     0.36"                                                    the connection to insulate it from the back of
                                         0.66"                the speaker.

     0.60"                                       1.32"

                                  0.88" Dia.


                                                         Photo 7
9.   Solder the other length of purple wire to the
     other speaker terminal. Slide a piece of shrink
     tubing over your connections and shrink with a
     heat gun, being careful not to point directly at
     the capacitor.

10. Solder one speaker wire to the solder terminal
    of the male Microconnector (Photo 9). Solder
    the other speaker wire to the remaining male
    Microconnector terminal. Slide heat shrink
    tubing over both connections and shrink with
    the heat gun.

                                                        Photo 10

                                                        14. Strip and tin the remaining length of purple
                                                            wire still attached to the DSD-090LC. Slide a
                                                            piece of shrink tubing over each piece.

                                                        15. Solder of these purple wires to the solder
                                                            terminal of the female Microconnector. Solder
                                                            the purple speaker wire to the remaining
                                                            female Microconnector terminal. Slide the heat
Photo 8                                                     shrink tubing over both connections and shrink
                                                            with the heat gun, being careful not the heat the
11. Peel the backing off of one side of the self-           decoder itself.
    adhesive speaker gasket with a pair of tweezers.
    Line up the gasket with the rim of the speaker      16. Following the diagram below, solder the
    and press into place. Peel off the remaining            remaining decoder wires to the 8-pin
    backing from the gasket. Line the speaker up            connector. Since you will not be using either
    with the hole cut in the center of the speaker          the brown or yellow wires for this installation,
    plate and press into place with the speaker             trim these wires back to about an inch and tape
    terminals oriented toward the tab as shown in           the ends to the side of the DSD so they will not
    Photo 9.                                                short to anything.

                                                                   Solder wires to ‘cup’ side
                                                                   of 8-pin connector

                                                        Motor Right (Orange)               Right Rail (Red)

                                                           Rear Light (Yellow)             Function Common (Blue)

                                                                    Not Used               Headlight (White)

                                                              Left Rail (Black)            Motor Left Gray

                                                             NOTE: If you wish to use a cam to synchronize the
Photo 9
                                                             exhaust or use the DSD-090's lighting effects, do
12. Slide the two-pin speaker connector through              not cut the yellow or brown wires! The yellow wire
    the hole in the coal bunker that you drilled in          can be used to hook up a tender backup light if
    Step 4.                                                  you wish; connect one buld lead to the yellow wire
                                                             and other to the Blue, or Funtion Common wire.
13. Mount the speaker assembly in the coal                   The brown wire connects to your cam.) Insulate
    bunker as shown in Photo 10. Run a bead of               your connections.
    RTV around the edges of the mounting plate
    being careful not to get any on the face of the     17. Remove the dummy plug on the Bachmann
    speaker. Set aside to let the RTV dry.                  PCB and plug the 8-pin connector into the
     exposed socket. The red wire should line up       17. CV Programming
     with the 8 marked on the Bachmann PCB.                Most of the sounds from the DSD-090LC will
                                                           not need to be changed. The default address is
18. Mate the two-pin female connector on the               3. You may wish to change the address of the
    DSD-090 to the two-pin male connector                  decoder by changing CV1 (see your command
    coming through the hole in the coal bunker.            station manual for instructions).

15. Attach the DSD-090LC to the tender roof, on            You may wish to make adjustments to the
    the opposite side of the tender from the 8-pin         Auto Exhaust Chuff Rate (if you have not
    connector, with Velcro or foam tape (Photo11).         installed a cam). Auto-Exhaust automatically
                                                           generates an exhaust chuff rate proportional to
                                                           the throttle setting. Since every locomotive is
                                                           different, CV 116 is used to match up the Auto
                                                           Exhaust rate to the locomotive speed and may
                                                           be loaded with any value between 0 and 127.
                                                           Higher values will yield higher chuff rates for a
                                                           given throttle setting. A typical synchronization
                                                           rate may be computed as:

                                                           CV Value = 115.9 X ———
Photo 11
16. Before you reassemble the locomotive, inspect          where SPD is the locomotive’s top speed in
    your work for mis-wires, shorts, broken or             scale miles-per-hour at full throttle and DIA is
    nicked wires.                                          the locomotive’s driver wheel diameter in scale
17. Before replacing the coal load insert in the
    top of the tender shell, drill some small holes        If you don’t know your locomotive’s top speed,
    in the 'coal' with a #65 drill. Space your holes       you can also estimate it and still get pretty
    approximately 1/4" apart and drill 30-80 holes         good results. A good rule of thumb is to use 45
    at random angles so they will not be visible.          MPH for freight locomotives and 70 MPH for
    Replace the coal load in the tender shell.             passenger engines.

17. Replace the tender shell. Be careful that the          Here are some suggestions for CV settings to
    wires are not caught between the tender shell          get you on track.
    and the frame. Replace the screw you removed
    in step one. Complete the connection between           CV 2         Start Voltage              20
    the locomotive and the tender by plugging in           CV 112       Articulated Exhaust        129
    the two small orange connectors.                       CV 116       Chuff Rate                 34
                                                           CV 115       Whistle Selection          1, 2 or 3
18. Put the locomotive and tender on the
    programming track and check for shorts.
                                                           The LC Series Owner’s Manual Software
                                                           Release 2.00 is available for download at our
                                                           web site (
                                                           html). This manual will give you additional
                                                           information regarding CV set up and
                                                           customizing the decoder for your operations.