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Function Decoders

Function decoders offer ONLY auxilliary/function outputs, and DO NOT have output for controlling motor or sound.

They have a wide variety of applications, but most commonly used to add lighting, smoke, or auto-coupling control to a vehicle that has no motor. For example, many modern steam locos have a DCC decoder socket in the tender, which gives control of the motor, so a separate function decoder can be added in the boiler of that loco to provide control of loco lamps, firebox glow and other special features.

Another common use is to provide DCC control of coach lighting, which is particularly effective where the decoder supports a stay-alive capacitor which helps eliminate flicker.

Zimo MX688N18 15x9.5x2.8mm
0.7A 8 Functions
MX689N18 forthcoming replacement

discontinued (MX689N18 will be replacement)

Zimo MX671
0.7A 6 Functions
Available in 6pin direct version (N) or wires only version (wired version includes Ground wire for stay-alive pre-connected).
Direct connection of 25V stay-alive supported
MX671Wires-only (often supplied with 6pin or 8pin plug on the wired harness)

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temp out of stock

MX671N6pin Direct

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Zimo MX685 20x11x3.5mm
1A 8 Functions
wires-only version
MX685wires only

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Zimo MX687W 28x15.5x4mm
1.2A 8 Functions with stay-alive facility, full feature/power version of MX686
wires-only version
MX687Wwires only

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A bit of YouChoos poster art for your enjoyment!