atlas rs1 overviewDec 19, 2008


  1. 678-828049 HO SoundTraxx DCC sound Tsunami decoder
    [2020 note, use the Tusnami2, part number 678-885015.]
  2. LED-5SW Qty = 2 LED 5 mm Sunny White
  3. R-820-1/8W Qty = 2 Resistor metal-film 820 ohm 1/8 watt
  4. SP-16x35-08 Speaker Rectangular 16 x 35 mm (5/8 x 1.4 inch) 8 mm (0.32 inch) deep 8 Ohms
  5. Wire 30AWG Blue
  6. Wire 30AWGYellow
  7. Wire 30AWGWhite
  8. Wire 30AWGViolet
  9. 269-9513 Styrene black sheet 6 x 12 inches x 0.02 thick 
  10. 272-1704922 Faller Expert Styrene Cement
  11. Nano-Oil 5, 10 & 85 wt
  12. Never Stall
  13. Gray Foam Tape

BASIC INSTALLATION: The Tsunami was snapped in place of the removed Atlas Light Board with the Forward direction on the decoder matching the F on the loco (long hood in this case). A small styrene mounting sheet was installed between the bosses on the weight over the front drive train. It was bent slightly to increase clearance against the hood. The capacitor was affixed to this plate with foam tape. The motor and rail power were wired to the decoder. The loco was tested for proper directional operation.

LIGHTING: To make room for the install, we removed the light pipes from the shell and mounted Sunny White LEDs in place of the light pipes. A resistor was installed in one lead of each LED and the LED and resistor pigtailed with color coded wire (blue to Anode - long LED lead - through resistor; white or yellow to the other LED lead). Shrink tubing was used ot insulate the connections. The LED was held in a set of clamping tweezers in a vice pointing up. Faller Expert Styrene cement was applied to the shell and the shell positioned over the LED with gravity holding alignment. When one LED was dry, the other was cemented. This removes the light supply to the number boards, which was pretty weak to start with. Additional surface mount LEDs could be used on the number boards, but the complexity exceeds the result in Bruce’s opinion.

SPEAKER: A pair of violet wires were attached to a 16 x 35 mm speaker. It was mounted in the shell below the LED on the short hood. An enclosure was made by putting 0.02 inch thich styrene between the speaker and the sides of the shell. The wires for the LED and speaker were routed along the top of the hood toward the middle of the loco. The open end (near the cab) was covered with 0.04 inch thick styrene - or use two pieces of 0.02 thick!

FINISH: The LEDs were wired to the connections on the ends of the boards, observing correct polarity. The speaker was wired to its terminals. The Lubrication was applied as needed. The decoder was programmed and the shell snapped back in place.


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Information on this site represents Bruce’s experiences and opinions. They are presented without warranty as an example of ways to utilize DCC products. The user is solely responsible for any use made of this data.