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SFX0416 SoundFX+Function Decoder (N Scale and Larger)

Price: $63.00
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SFX0416 SoundFX+Function Decoder


  • Wired Mobile Decoder with SoundFX™+Accessory type functions for most HO Locomotives.
  • Preloaded with selectable steam and diesel Sound Schemes
  • Includes 28mm 8 Ohm Speaker & 330uF Capacitor
  • Note: The SFX0416 has no motor functions and is to be used in conjunction with a standard mobile decoder such as a DH123D etc
  • The speaker supplied is suitable for HO.  For smaller gauges order the appropriate speaker size for your application.


Current Rating 1.0 Amp (total)

31mm x 16.7mm x 6.3mm

Installation Wired replacement decoder
Function Outputs 6-250mA (total 800mA)
Function Type



Series 3


A Note about Steam Chuff/Cam configuration: CV133 and CV134 work together to control chuff timing:

CV133 Steam Chuff/CAM config, 128=>EXT cam, 1-127=>DRIVER dia in inches[63]
CV134 Steam gear ratio trim, 32=100% ratio, [32]

Setting CV133's value from 1-127, puts the SFX064D into 'Autochuff' mode. Autochuff mode tells the decoder to simulate driver chuff timing in software. The CV133 default value is 63, approximating a real-world loco driver diameter of 63 inches. If you halve this figure you will effectively double the chuff rate for a given loco speed.

CV134 (gear ratio) also effects the Autochuff rate. The CV134 default value of 32 assumes no gear reduction. Doubling this value to 64 tells the decoder to simulate a 2:1 gear reduction thereby doubling the chuff rate. CV134 and CV133 work together to create the desired chuff rate in your locomotive.

A final note on Chuff support - Setting CV133 to a value of 128 tells the SFX064D that you want to configure an actual cam input on your locomotive. CV134-->128 tells the decoder to activate the white cam input wire on the 10 pin sound harness of the SFX064D (see diagram below)

A chuff will be triggered when a pulse of over 6 volts or DCC track voltage is seen on the white CAM input lead.  This voltage has to go off (0 volts) before the next chuff can be triggered.

Item Number: SFX0416
Manufacturer: DigiTrax
Mfr Part No: DIGSFX0416

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