21MTC Adapter Board 3 (51957)

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Multifunction Decoder:

Electronic Solutions Ulm: 21MTC Adapter Board 3 (51957)

Summary: Install a 21MTC multifunction decoder without a lot of soldering. Includes a mounting lug, and is almost the same footprint as the mating decoder.

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General information
DCC Category
Multifunction Decoder
Manufacturer Electronic Solutions Ulm
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Manufacturer Part Number
Common Name 21MTC Adapter Board 3
UPC Number
Release information

Product URL External Product Link
Has computer interface
Firmware Upgrade Possible
Misc Details
Length 31 mm3.1 cm <br />0.031 m <br />1.22 in <br />0.102 ft <br />
Width 15.5 mm1.55 cm <br />0.0155 m <br />0.61 in <br />0.0509 ft <br />



Adapter for multifunction decoders with 21MTC interface is suited for convert a vehicle to DCC without an interface using a decoder with many functions without major soldering.

With its compact dimensions of 30.5mm x 15.5mm it is almost the same size as the decoder and also equipped with an extra mounting lug that can be easily broken off if not required.

The board is equipped with amplifiers (about 250mA each) for the function outputs AUX3 through AUX6, which are only provided as logic outputs on all VHDM, NEM resp.

For easy handling and wiring the most important contacts are already equipped with 200mm long wires.


  • Length 31.0mm x 15.5mm
  • With mounting tabs: 36.0mm x 15.5mm

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