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Home » Products » Zimo » Mini Sound Decoder Next18
Mini Sound Decoder Next18


Zimo -
Mini Sound Decoder Next18

This item is in Stock and available for dispatch
Our Price

Current Rating - Avg 0.7 Amps , Peak 1.5 Amps
Connector - Next18
Size - 15 x 9.5 x 3.3 (mm)
Functions - 4 (0.5Amps Total Max) + 2 Logic Functions
RailCom - Yes
Asymmetric DCC - Yes
BEMF - Yes
Sound - Yes
KeepAlive/Standby (Available) - Yes

This replaces the small MX659N18 decoder and is only offered with a Next18 plug.
The dimensions of this SOUND decoder are exactly the same as the NMRA and VHDM standards for NON-SOUND decoders with Next18 interface.

MS-Sound with 1W fully digital sound amplifier for 8 Ohm speakers.

Stay-alive: No special connection, but like on all decoders an external circuit with some diodes, resistor and an energy storage capacitor up to 1000 µF can be connected

DCC addresses 1 – 10239, consist addresses 1 – 9999, MM addresses 1-80, functions F0-F28
14, 28 or 128 external speed steps, 256 or 1024 internal steps
Programming CVs in “Service Mode” (on the programming tracks) and in “Operational Mode” (with RailCom for feedback and acknowledgements), using mfx, if available
Driving operation without interruptions (without decoder reset or restart) after losing contact to the rails for 1 or 2 seconds (even without external stay-alive capacitors)
Automatic continued operation if the wheel/track contact is interrupted until the supply is restored (if sufficient energy storage - "Stay alive" - is available in locomotive; see section "ENERGY STORAGE, below)").
DC and AC analog operation, the latter including direction reversal through Märklin-typical overvoltage pulse (up to 35 V)
Updateable software: new software versions are loaded into the decoder without opening the loco, via flash drive with the decoder updating and sound loading device MXULF/A or with the central controller MX31ZL, or directly from the computer via ZSP (ZIMO Sound Programmer) and MXULF or MX10 (planned)

Overcurrent protection for all outputs, protection against overtemperature
Protection against high voltage peaks due to the inductivity of the motor by suppressor diodes

Motor Control

Silent high frequency motor control, eligible between 20 kHz and 40 kHz
Suited for all DC motors and coreless motors (Faulhaber, Maxxon) with additional diodes also AC motors
ZIMO motor control with self-optimization and various possibilities for manual adjustment
Speed characteristic curve either there-point or freely programmable in 28 steps (according to the standard)
Alternative “East-West” direction control and feedback in combination with digital central station MX10 or controller MX32
Km/h control (each speed step equals ½km/h, 1km/h, 2km/h) as alternative to the traditional speed step control
Adjustable procedure to level the idle run when changing direction to avoid start-up jerks
ZIMO acceleration adjustments ("standardized", additionally "exponential" for smooth driving off/stopping, "adaptive" against start-up jerk)
Functions of shunting-key (half-speed, reduction or turn-off of the acceleration/deceleration times, eligibly F3, F4 or MAN)
Automatic continuance when interrupting the rail/track-contact until the power supply is restored (in case of a stay-alive capacitor)


Full NMRA function mapping for F0-F12, as well as ZIMO expansions (direction-dependent allocation, etc.)
Dimming, flashing, American (Mars, Ditch, Strobe, etc) and other lighting effects (Soft Start, braking light, flickering, automatic time-off, etc.)
Switching high beam/low beam per function key, unilateral light suppression, configuration of smoke generators, etc.
ZIMO Swiss Mapping for complex lighting situations depending on different function keys with individual allocation of lighting effects (dimming, flashing, etc)
ZIMO Input Mapping, especially for the user to exchange function keys without actually changing the configuration
Time-limited coupling control for Krois and Roco and automatic uncoupling (automatically moving in slightly, uncoupling and moving away)
SUSI interface on the connector or as solder pads, for large scale decoders with 4-pin SUSI connector
Additionally to "normal" function outputs, the MS decoders also have logic level outputs which can be used as connections for servos or as transistors for traditional consumers (LEDs, etc.)
All decoders have a servo drive, those for gouge N to H0 as a secondary function of the SUSI connections, large scale decoders with full 3-pin servo connections including 5 V supply.
Servo configuration with special CVs for end and middle positions, rotation speed, function assignment.


Braking distances DC, ABC (stopping because of asymmetrical DCC signal), "Märklin braking distance"
ZIMO "signal dependent train control" (HLU) with speed limits in 7 steps, from "Full speed" to "Halt/stop": F, FL, L(ow speed), LU, U(ltra low speed), UH, H.
ZIMO loco number recognition in combination with ZIMO digital systems and track section modules MX9 (with new layouts or applications, especially with StEin or Roco feedback modules, the feedback works with RailCom)
(from sw version 5.00 on) Constant braking distance in two variations: braking is either started immediately or later, depending on the current speed.
RailCom: km/h feedback, reading and acknowledging CVs on the main, East-West feedback, Quality-of-Service, on-track search, RailCom address feedback,…
Many more features are planned in future software versions.


Standard H0 sound decoder: connection option for external energy storage (electrolytic capacitors, tantals, gold caps with unlimited capacity and 15 V or 16 V dielectric strength, even if track voltage is higher, for example ZIMO SUPERCAP68 or GOLMRUND, GOLMLANG); thus continuing to run at full power despite contact interruption, avoiding light flickering and sound disturbances, compensating for energy loss through RailCom and HLU gaps.
Next-Sound-Decoder: the internal tantalum energy storage on 5 V-basis can be extended by external tantals or goldcaps (with practically unlimited capacity 5 V of 2 x 2,7 V, e.g. ZIMO MINIGOLD); thus slow driving, reduction of light flickering and sound disturbances.
For all decoders: with ZIMOs "StayAlive-Controller" (STACO1), or additional components like diodes and resistors, energy storage devices (mostly electrolytic capacitors, at the level of the driving voltage, preferably 25 V) can be connected to all decoders, even those without special precautions. The efficiency (energy yield) is lower than in the cases mentioned above.

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