- Locodecoder


Claudius Veit

+++ Wir haben vom 1.4. bis 7.4.2024 Betriebsferien +++
+++ We have company holidays from 1.4. to 7.4.2024 +++

Independently which type of VELMO decoder you buy nearly all decoders have one thing in common:
The simple way of installing the decoder without soldering, milling, filing or cutting.
And, if necessary, the possibility to return the locomotive to their original condition.

Decoders for locomotives with light bulbs for the headlights:
Each end of the decoder is populated with at least one white LED for the triple headlight. Depending on the locomotive class, most decode types are populated with additional red or white LEDs to get the rear light.
These maintenance free LEDs replace the original light bulbs of the locomotive.

Decoders for locomotives with LED lights:
The decoder drives the original LEDs of the locomotive housing. Therefore, contact latches, that work in the same way as the latches of the original circuit board, are already soldered on the decoder circuit board.

Please refer the decoder features at the Part Numbers page under the heading Products.

The DCC and SelecTRIX® Multiprotocol-Decoders

Data format:                                   DCC, SelecTRIX® 1 and SelecTRIX® 2

Nominal supply voltage:              12V digital voltage
Maximum supply voltage:            15V digital voltage
Maximum continuous current:      500mA

  • Automatically switchover from conventional DC to digital operation
  • In case of digital operation the last programmed digital system will be activated
    (no automatic switchover)
  • SelecTRIX® 1, 31 speed steps, 100 addresses
  • SelecTRIX® 2, 127 speed steps, 10000 addresses
  • DCC short addresses (1-127), long addresses (0001-9999),
    with 14, 28, 128 speed steps
  • Super-Soft-Drive (SSD)®, load compensation state of the art, with especially smooth regulation behavior 
  • Various regulation variants for an optimal adaptation to the motor
  • Adjustable motor frequency (16 kHz, 32 kHz, low frequency)
  • 127 internal speed steps
  • Block system operation by simple diodes and asymmetric digital signal
  • Bidirectional communucation
  • Light and function outputs can be dimmed and activated analogically
  • Shunting gear
  • Electronic interchange ability of motor, lighting and track connections
  • All function outputs freely programmable
  • Thermal protection
  • Reset function for DCC und SX2
  • Decoder can be updated (no need to open the locomotive):
    The update can be executed on the installed decoder when the loco is on the track

The decoder is functionally identical to the Doehler & Haass decoder DH10C.
For more information about the DH10C please refer to the webpage of
Doehler & Haass.


Function Lights
Headlight and rear light changes with the direction of travel.
Depending on the locomotive type, each decoder is either equipped with up to 4 light outputs to drive the original LEDs of the locomotive housing (therefore, contact latches are already soldered on the decoder circuit board) or with on the decoder populated LEDs (these LEDs are part of the decoder circuit board and replace the light bulbs of the locomotive).
The light function can be assigned to any function key via configuration variables (function mapping). The intensity of the light is also dimmable by changing of configuration variables.

Function Low Beam / High Beam
The low beam / high beam function can be assigned to any function key via configuration variables. The intensities of low beam and high beam is adjustable. By pressing the function key, the headlight toggles between the two preset intensities.

Function Partial Light Deactivation (Preclusion)
The partial light deactivation allows to deactivate the lights at a specific end of the locomotive.
A typical situation where to apply this function is the push-pull operation. The headlights and rear lights pointing to the waggons must be switched off, but the other lights must be reversed in the direction of travel (white / red).

Function Shunting Gear
The shunting gear allows a fine speed control at low speeds. Aditionally, the shunting headlights (headlights at both sides) are powered on.
The shunting gear function can be assigned to any function key via configuration variables.

Decoder Presets:

The decoders are preset as follows:
Operating system:  DCC, address 3 (short), 28 / 128 speed steps

Preset function mapping:
F0 (light) - headlight and rear light (changes with the direction of travel)
F1 - toggles high beam / low beam
F2 - deactivate headlight / backlight at driver’s cab 1
F3 - deactivate headlight / backlight at driver’s cab 2
F4 - shunting gear and shunting headlights (headlights at both ends)

Not every decoder type is equipped with the full range of functions.
Other decoders like the traction unit decoders or the decoders for US american locomotives have a different configuration due to the different or additional light functions.
For more information please refer the decoder features at the
Part Numbers page under the heading Products.

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SelecTRIX® is a registered trademark of Gebr. Märklin & Cie. GmbH, D-73033 Göppingen
Super-Soft-Drive (SSD)® is a registered trademark of Doehler & Haass GmbH & Co. KG, D-81249 München