PROJECT ARTICLES by Fred Miller, MMR

The below listed articles are provided in Adobe.pdf format.  Click on the Article title to download the project article.

All About Digitrax Sound Decoders 

This is a revised document describing the characteristics and uses of Digitrax DCC SFX sound decoders.  The document now includes the new Series-6 Standard and Premium decoders. A copy of the document in .pdf format is available for download here.

Sounds for Traction Modelers 

  • Generic Traction Sounds: This article describes the use of the Digitrax DCC SFX sound decoders to provide custom sounds.  The discussion is based on the otherwise unavailable traction (trolley and interurban) sounds.  The referenced  TRACTION V1 sound project for Digitrax Sound Decoders is available without charge.  Just click here to start a download of a zip file containing "TractionV1.spj" or email your request. A sample .wav file demonstrating the available sounds in the project is available to download here.
     

  • Peter Witt Streetcar Sounds: This article describes a new Digitrax DCC SFX Sound Project support of sounds for the Bachmann HO Peter Witt Streetcar. The project file PETERWITT is available without charge. Just click hear to start a download of a zip file containing "PeterWitt.spj" or email your request. A sample .wav file demonstrating the available sounds in the project is available to download here
     

  • Birney Streetcar Sounds: DCC SFX Sound Project for the Birney Streetcar as described in my Sounds for a Birney Streetcar article in the May 2012 issue of the NMRA Magazine. The article describes a new Digitrax DCC SFX Sound Project support of sounds for the Bachmann HO Birney Streetcar. The project file for BIRNEY STREET CAR is available without charge. Just click here to start a download of a zip file containing "BirneyStreetCar.spj" or email your request.
     

  • Several different Sound Projects are available for PCC Streetcars.  The projects are available without charge.  Just click as directed to start a download of a zip file containing the spj file or email your request.
     

    • A combination (both Pre and Post War cars) DCC SFX Sound Project PCCSET.SPJ is available in one project. The user can select which sound set with a CV setting  (CV60-Scheme).  The sounds and performance are the same as the below individual projects.  This Sound Project was described in my article PCC Sounds for PCC Streetcars in the June 2012 issue of Model Railroader magazine. Just click here to start a download of a zip file containing "PCCSET.spj"
       

    • Air (Pre War) PCC Streetcar Sounds: This DCC SFX Sound Project PCC-I.SPJ supports sounds for an Air PCC Streetcar such as the Con-Cor HO PCC car. Just click here to start a download of a zip file containing PCC-I.spj  A sample .wav file demonstrating the available sounds in the project is available to download here
       

    • All-Electric (Post War) PCC Streetcar Sounds: This Digitrax DCC SFX Sound Project is available in two versions, both supporting sounds for an All-Electric PCC Streetcar such as the Bowser HO PCC car. The project file PCC-II.SPJ is compatible with the use of a MTS M4T motor decoder in parallel with a Digitrax sound Sound Bug, while PCC-III.SPJ is more general and is suitable for the Digitrax SDN144 combination motor/sound decoder or a Digitrax SoundBug and any other motor decoder. Click on the project name to start a download of a zip file containing the spj file.  A sample .wav file demonstrating the available sounds in these projects is available to download here
       

SPJHelper Development Software

This program was developed as an aid in the construction of "Sound Projects" for the Digitrax SFX sound decoders.  The latest version (6.0) supports the new Digitrax Series-6 Premium decoders. The program operates in two modes: one for simple non-technical design of Sound Projects, and the other for the experienced programmer wishing to use easy access to the necessary tools.  A FREE Version of the latest SPJHELPER software can be accessed from here.

SPJViewer Software

This software is a subset of the full SPJHELPER. It provides a quick and easy way to display the components of an existing SPJ (Sound Project) file. It shows what Digitrax SFX decoder is necessary and displays the characteristics of the sound clips included in the SPJ. The sounds can be played and no changes are made to the SPJ. No other software is necessary.  A FREE Version of the latest SPJVIEWER software can be accessed from here

General Purpose SFX Decoder Sound Player

This article describes a Sound Decoder Project which provides a flexible tool to play layout background sounds on Digitrax SFX sound decoders.  Three different voices can be initiated by DCC Throttle Function Keys, CAM switch inputs and automatic timed delays.  The SPJ file to load into a decoder is available in a zip file here.

SFX Sound Decoder to Amplifier Interface

This article describes a circuit to enable playing Digitrax SFX Sound Decoders through an external amplifier, for example, powered speakers for PCs. or the line-input on a PC.

SFX Sound Decoder CAM Debouce Circuit

The CAM input to a Digitrax SFX Sound Decoders can be more useful than just the steam engine "chuff."  This article describes a circuit to "debounce" the input for useful triggering of other decoder functions.

Make your own Miniature Plug Sets

This article describes an easy and inexpensive way to make your own miniature plug and socket sets.  These are particularly useful for connections to onboard decoders.

Design and Construct Custom Trackwork.

This article describes a technique of designing custom track work using a PC for developing plans and templates for construction.

Movable Trolley Wire Frogs for Freight Switching Operations.

This article describes an approach to build trolley overhead which enables "back-polling" into sidings with trolley freight equipment.

Modifications to DCC Throttles for test track.

This article describes modifications to the Digitrax DCC UT-1 throttle to enable automatic DCC locomotive reversing on a test track or other configuration requiring automatic changes in direction.

Test Track Reversing Circuit 

This article describes a simple and inexpensive circuit for automatic locomotive reversing on a test track or other configuration requiring automatic changes in direction.  Although designed for DC controlled locomotives, it can be used with DCC and a modified UT-1 throttle (See above article)

HO Powered Uncoupling Ramp 

This article describes the construction of a circuit which provides a timed pulse to the Kadee under-track electric uncoupling ramp.

Speed Modifications to Digitrax BD-1 Detector modules 

This article describes modifications to the Digitrax BD-1 DCC detector module to speed up the ON and OFF reaction time to less than a second.

Fire Flicker Circuit 

This article describes the construction of an inexpensive circuit to cause an LED to flicker to simulate a fire or welding torch.

Random Lights Circuit 

This article describes a modification to the Fire Flicker Circuit which can be used to randomly light 1 to 8 lamps as in house lighting, etc.

 

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