Locomotive Decoders

Locomotives on DCC layouts require a decoder to be fitted to control the motor direction and speed. Additional functions are available on most decoders, usually function 0 being used for directional lighting. DCC Ready locomotives are fitted with a plug-in socket for a decoder, check which type is needed for your locomotive, usually this is shown on the end of the box and operators leaflet. Locomotives without a socket can be fitted with decoders by direct wiring or by fitting a socket on a harness. Reference to Peco decoder installation Shows You How 20 booklet is recommended for guidance.
Bachmann DCC Decoder Adapter 8-Pin Decoder Socket with 21-Pin Decoder Plug 36-559
This adaptor plate is an alternative to fitting 21-pin decoders, allowing the 8-pin connector of a standard decoder harness to be adapted to fit the 21-pin connection used on many recent OO diesel locomotive models.
£3.95
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(Product Ref 63611)
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DCC Concepts Zen 218 4 Function Decoder with Stay Alive

The Dcc Concepts Zen 218 decoder is a versatile decoder which  provides both 21 and 8 pin connections and includes a separate stay alive unit. Due to its size will fit in most OO/HO scale locomotives.
£29.95
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(Product Ref 103032)
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A 5 inch long harness with plugs to connect a T series decoder with a standard NMRA 8-pin socket. This allows you to select the a length of wiring harness best suited to each model.
£4.99
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(Product Ref 51679)
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E-Z Command 21-Pin Decoder Blanking Plate 36-058
Pack of 10 21-pin DCC decoder mounting blanking plates for setting locomotives to DC only operation.
£10.95
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(Product Ref 69607)
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Bachmanns 36-556RA decoder is a Soundtraxx product fitted with a 6-pin plug-in connector mounted at right angles to the decoder board and projecting at one end. This allows the chassis designers a much wider choice of mounting locations, for example the decoder can be fitted vertically inside the cab of a steam locomotive
Decoder measures 14.5mm x 9.5mm x 3.5mm

Based on the high quality and highly capable Soundtraxx MC1 decoder a wide range of user configurable CVs allow the decoder to be tuned and matched to most model railway locomotive motors. A continuous rating of 1 amp is available, making the decoder suitable for N, OO/HO and even small O gauge locomotives. Two function outputs are available with a 100mA maximum load on each.
Supports 14, 28 and 128 speed steps with back EMF regulation and 15.6kHz PWM speed control, short and long (extended) addressing, advanced consist addressing (for double-heading and multiple units) , adjustable acceleration/deceleration rates. The decoder has 15 pre-set speed curves, allowing fine control speed ranges to be adjusted and supports user-defined speed curves with 28 reference points.

£19.95
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(Product Ref 77473)
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Bachmann DCC Decoder Adapter 6-Pin Decoder Socket with 8-Pin Decoder Plug Pack of 3 36-563
A useful adapter from Bachmann, providing the option to fit a 6-pin decoder to a model with an 8-pin socket.
This can be useful on models with restricted space for the decoder, as on many steam locomotives, providing�the option of fitting a small footprint 6-pin decoder, designed to fit inside the body of an N gauge model.
£18.95
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(Product Ref 78061)
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A 8 Pin (NEM652) DCC Decoder suitable for models fitted with a 8 Pin DCC decoder socket.

Dual-mode DCC/DC decoder with Back EMF function
4 powered function outputs
0.9A continuous load
RailComPlus® for automatic registration when used with selected DCC systems
Suitable for models equipped with DC motors (including coreless motors)

£35.95
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Bachmann Plux22 decoder with 1.2A continuous 2.5A peak motor power rating, 11 function outputs.
£44.95
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(Product Ref 121688)
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A Plux22 (NEM658) DCC Decoder suitable for models fitted with a Plux22 DCC decoder socket. This decoder replaces item Nos. 36-570 and 36-570A and can be used in any model for which item Nos. 36-570 or 36-570A are recommended
£46.95
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(Product Ref 123705)
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A 6 Pin (NEM651) DCC Decoder suitable for models fitted with a 6 Pin DCC decoder socket and where minimal space is available for the decoder, for instance the Graham Farish Class N Scale 03 and 04 Diesel Shunters and the Bachmann Narrow Gauge OO9 Scale Quarry Hunslets.
£54.95
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(Product Ref 7468)
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AE Model 21-Pin Direct 6 Function Decoder – Quality decoders at a sensible price.

All AE decoders conform to NMRA and NEM standards. They are produced to the highest quality standards. They also include many unique features and are tailored to give best performance straight from the box.

£21.95
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(Product Ref 116002)
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AE Model 6-Pin Direct 2 Function Decoder – Quality decoders at a sensible price.

All AE decoders conform to NMRA and NEM standards. They are produced to the highest quality standards. They also include many unique features and are tailored to give best performance straight from the box.

£19.95
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(Product Ref 116000)
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AE Model 8-Pin Harness 4 Function Mini Decoder – Quality decoders at a sensible price.

All AE decoders conform to NMRA and NEM standards. They are produced to the highest quality standards. They also include many unique features and are tailored to give best performance straight from the box.

£21.95
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£54.95
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£17.95
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DCC adapter plate with a socket for 8 pin decoders and connector 'plug' for 21 pin connection.
This allow 8 pin decoders (eg. Hornby TTS sound decoder) to be connected to locomotives with 21 pin decoder 'sockets'. Additional solder pads are provided to allow for up to 6 function channels.
Photo shows pack of 50 for illustration only
Only 1
£4.50
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The DCC90 is a large 8 pin decoder which is fitted with a removable 25mm harness including 2 function wires. Fitted in the decoder is a small 2 pin socket which can have the PowerPal inserted into it (sold separately), This helps keep the locomotive moving in dirty or dead track sections.
Length 27mm, Width 17mm, Thickness 7mm, Harness Length 25mm.
£25.50
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(Product Ref 123186)
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The DCC93 is a 6 pin direct plug decoder which is most suited to N Scale locomotives. It can also be used in some HO/OO locomotives.
Length 10mm, Width 11mm, Thickness 3mm.

£29.50
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(Product Ref 73285)
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Zen decoder software has always been smooth, clever and easy to use but our new BLACK decoder range takes this to a new level, with extended and improved automatic braking and shuttle abilities, simple-to-use ONE step locomotive set-up and advanced brown-out protection.
All of our decoders are tested at least 3 times before we package them for sale, so we know that they all work perfectly when we sell them and you can be quite confident that reliability is assured.
£79.95
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(Product Ref 96485)
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Zen decoder software has always been smooth, clever and easy to use but our new decoder range takes this to a new level, with super-advanced brown-out protection, nano size and stay-alive connection wire attached.
All of our decoders are tested at least 3 times before we package them for sale, so we know that they all work perfectly when we sell them and you can be quite confident that reliability is assured.
£29.95
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(Product Ref 88604)
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The ZN8H is remarkably small! DCC Concepts started off with the world’s smallest, then shrunk it even more!
Fitting the same footprint as Nano Direct this Nano has a wire harness and is even thinner! A super-small go-anywhere wired decoder with 2 x 100mA light functions and wired ready for the Stay-Alive to be fitted(Not Provided)
ZN8H is only 15x7x2.7mm and has a 750mA / 1 amp motor drive.
£29.95
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(Product Ref 87616)
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Exclusive to DCCconcepts, this pack now includes all 11 “standards defined” decoder wire colours including Pink! Each is 6 metres long. With Pink now included, for the first time ever, you can wire all 6 functions with the correct standards colour code!
£29.95
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(Product Ref 116014)
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Train Control Systems DP5 Board Mounted Decoder DP5
A very simple to install decoder, you plug the actual decoder board into the 8-pin DCC decoder socket!
This board provides 5 function outputs through direct socket connections and solder pads. Ideal for locomotives with extra accessories or custom wiring to allow head and tail lights to be separately controlled.
Rated at 1.3amps continuous with 2 amps peak for motor drive there are five function outputs available. Two functions can provide 250ma, the remaining three outputs are 100ma. some connections needing to be made using solder pads on the decoder board.
Board measures 0.845in/21.5mm length, 0.680in/17.3mm width and 0.165in/6mm height.
£34.50
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(Product Ref 56281)
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Train Control Systems 21-pin 6 Function BEMF Decoder EU621
This full featured BEMF, 6-function decoder is designed for HO-Scale locomotives equipped with a 21-pin connector, as fitted on many new OO diesel locomotive models. The availaibility of 6 function controls provides control over the extra lighting functions fitted to recent models, from switchable tail lamps to cab interior lighting.
Suggested decoder for Murphy Models class 201 locomotives which use 5 function controls.
Included is TCS auto-adjusting BEMF for outstanding slow speed performance and hassle free set up. Also includes Quiet Drive for super quiet engine performance.
Motor output : 1Amp continuous, 2Amps peak
Function outputs : 6 functions at 100mA.
Dimensions:  .797” x .614” x .185”  or  20.24mm x 15.58mm x 4.73mm
£33.95
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(Product Ref 51678)
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Train Control Systems OO/HO 8 Function 21 Pin Locomotive Decoder EU821
This full featured BEMF, 8-function decoder is designed specifically to meet the needs of HO-Scale modelers who are converting their HO-Scale locomotives equipped with a MTC 21-pin inline socket to DCC. We have included our next generation BEMF for outstanding slow speed performance, quiet drive for super quiet engine performance, and auto adjusting motor control for hassle free set-up.
NOTE:
The EU821 is compatible with the MTC 21-Pin and NMRA 21-Pin Standards.
Dimensions:
.797” x .614” x .198” or 20.24mm x 15.58mm x 5mm
£37.95
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(Product Ref 57021)
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Train Control Systems 6 Pin 2 Function Decoder EUN651
This full featured 2 function BEMF decoder is designed for N-Scale locomotives equipped with a six pin inline socket. Included is our auto-adjusting BEMF for outstanding slow speed performance and hassle free set up. Also includes Quiet Drive for super quiet engine performance.
£33.95
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(Product Ref 88324)
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New Imperium decoder with 8 function control outputs, switchable between logic and non-logic.

imperium decoders are compatible with NMRA and MOROP DCC standards. RailCom is not supported.
£29.00
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(Product Ref 83033)
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£21.35
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(Product Ref 41643)
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Dapol Imperium5 6-pin micro decoder with 4 function outputs designed for use with N gauge and small OO gauge locomotives.
Measures 10 x 8.34 x 2.8mm
£25.60
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(Product Ref 94285)
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Dapols Imperium 6 decoder is the Plux22 connection version of the Imperium series of small size 8 function MTC decoders offering a 1amp rating, 2amp peak and 100mA function output.
Decoder size to be confirmed.

£28.10
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(Product Ref 119980)
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The Dapol Imperium decoder is a small size 21 pin 6 function decoder with 1amp rating, 2amp peak and 100mA function output.
Decoder measures 15mm across the connector, 17mm length. 10 years warranty against failure in normal use.
£26.15
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(Product Ref 121733)
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Train Control Systems MC6 Micro Decoder "X Series" MC6
1A continuous 2A peak motor output. Six 100mA function outputs. Board measures 18mmx10mmx4mm height
Designed to fit N gauge locomotives this decoder supplies enough power for an average OO/HO locomotive and still features six function outputs! Ideal for small diesel locomotives with lighting circuits, this decoder will fit restricted spaces without losing any weight. Fitted with a miniature 7-pin harness connector and wiring harness.
£25.85
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(Product Ref 51672)
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Train Control Systems Long Harness for MC Series Decoder 7" MC-LH
A 7-inch long harness with plugs to connect a MC series decoder with a standard NMRA 8-pin socket. This allows you to select the a length of wiring harness best suited to each model.
£4.99
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(Product Ref 56301)
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Small decoder with 6 pin connection on a short flylead.
The 6 pin connection is used in N gauge and many smaller OO gauge locomotive models.
£31.49
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(Product Ref 107644)
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This adapter allows you to use an existing power supply with the HM7000 system.
£7.99
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(Product Ref 120861)
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Contains a Hornby P9300 4amp power supply with power adapter lead to supply 15VAC to the track as a permanent supply for Hornby HM7000 DCC/Bluetooth decoder equipped locomotives
£56.00
MRP £59.99
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(Product Ref 120865)
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Hornby Sapphire DCC Digital Locomotive Decoder R8245
A high specification decoder with a wide range of configuration options the sapphire has a 21-pin socket connection and is supplied with a wire harness to an 8-pin plug. Decoder measures 23 x 16.5 x 6.5mm.

Supports 1 Amp continuous current with 1.5 Amp stall. low speed "gear" for shunting operations. Size: 23mm x 16.5mm x 6.5mm. Set amounts of "water" and "fuel" can be stored in the Sapphire providing real time fuel consumption. Burn rates can be selected.
£39.99
MRP £42.99
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(Product Ref 63643)
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A small-size 4-function DCC locomotive decoder delivering up to 1 amp peak motor current, 0.5 amps continuous and four 100mA function outputs. The small size makes this decoder a good choice for smaller locomotives where the standard-size decoders are awkward to accomodate.
We have found that the Hornby decoders do not always survive soldering, use of a harness (eg Bachmann 36-564) is suggested for hard-wired installations.
8-pin harness connection.
Supports extended addressing and back-EMF feedback motor control.
Decoder measures 17mm x 10mm x 3.mm
£26.75
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(Product Ref 73564)
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Train Control Systems 1.5 Volt Regulator Board VR1.5-H
A 1.5-volt volttage regulator add-on for use with many TCS DCC decoders to permit existing 1.5-volt lighting circuits to be retained. Max input voltage 13v. Output 1.5v, 120ma.
£8.50
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(Product Ref 58544)
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Bachmann 21-Pin DCC Decoder with Back EMF and 4 Function Outputs 36-557
Bachmann 36-557 provides a basic technology decoder with the 21-pin socket type connection, ready to fit onto the 21 pin connectors. These are becoming more widely used, especially in OO diesel locomotives from Bachmann and Dapol. The decoder has one blank hole (the missing 22nd pin), ensuring correct orientation every time. Usually the decoder will fit flat just above the main control board, no wires to be tucked away during as the body is refitted!
This decoder provides a 1 amp power output with configurable high-frequency pulse-width modulation back-EMF motor control for smooth running and configurable speed curves. Shunting speed fucntionality allows the maximum speed to be halved for accurate speed control during slow running and shunting. Four function controls are available with a maximum 350mA combined output.
Decoder measures 25mm long, 15.5mm wide with socket at one end.
£27.95

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(Product Ref 92870)
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Bachmann Wiring Harness with NEM651 Socket for 6-Pin DCC Decoder Pack of 3 36-562
Ideal for fitting decoders to older locomotives not equiped with sockets without the risk of accidental damage to the decoder during soldering.
This wiring harness has fittings to connect a NEM651 6-pin decoder, commonly used with N gauge models. Many of these decoders have a power rating easily able to drive OO model locomotives and ths small size makes these decoders a good choice for small engines.
£15.95

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(Product Ref 78060)
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Bachmann 4 Function 8 Pin 0.9 Amp Locomotive Decoder with RailComPlus 36-566
Bachmann 36-566 0.9 Amp 4 Function 8 Pin DCC Decoder featuring RailComPlus
Bachmanns 36-566 decoder is an ESU-based decoder offering advanced and highly configurable back-EMF motor control functionality and RailComPlus communications.
Maximum motor output is limited to 900mA continuous, plenty for all modern OO model locomotives. Four function control lines are available, one as usual being set up for control of directional lighting. Function ouputs can deliver up to 500mA, with a maximum 250mA per output.
Length 26mm, Width 15mm, Height 6mm. Wire length 80mm. 8 pin plug.
£27.95

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(Product Ref 45691)
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Bachmann Next18 Locomotive DCC Decoder 36-567
Miniature NMRA Next18 connection 4 function DCC decoder produced for Bachmann by Zimo of Austria.
Decoder delivers 0.7A motor current, wiht a total current peak capability of 1.5 amps. Features 4 function outputs with 4 logic level outputs. RailCom supported.
Measures 15 x 9.5 x 2.8mm
£46.95

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(Product Ref 52879)
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£36.95

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(Product Ref 100274)
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Wiring harnesses allow decoder sockets to be fitted to models without built-in sockets. This allows the necessary soldered connections to be made before an expensive and damage-sensative decoder is attached. The 200mm length harness also allows the wiring to be arranged to reach a convenient place for the decoder to be situated inside the model.
£13.95

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(Product Ref 100744)
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8 pin blanking plate for fitting into a DCC locomotive that has had the DCC chip removed. This will convert a DCC locomotive back to analogue (DC) use. These plugs should allow power to the motor from the track and may allow any lighting to work. It requires the locomotive to be fitted with an 8 pin socket. Comes as a pack of 2 for convenience. Designed in red, so more difficult to lose on the workbench!
£4.99

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(Product Ref 125662)
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The Dapol Imperium decoder is a small size 21 pin 6 function MTC decoder with 1amp rating, 2amp peak and 100mA function output.
Decoder measures 15mm across the connector, 17mm length. 10 years warranty against failure in normal use.
£27.40

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(Product Ref 82011)
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Dapols Imperium 2 decoder is the Next18 connection version of the Imperium series of small size 6 function MTC decoders offering a 1amp rating, 2amp peak and 100mA function output.
Decoder size to be confirmed. The 21 pin version measures 15mm across the connector, 17mm length. 10 years warranty against failure in normal use.

£27.40

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(Product Ref 89446)
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Antics can supply and instal decoders to new DCC Ready OO gauge locomotives! For just £15.00 we can fit a decoder, leaving only final identity programming to be done. Add the DCC Ready OO gauge locomotive of choice to the basket, then add a decoder installation to the order, either select a decoder or request us to supply a suitable decoder (use the other instructions box of the checkout screen).
We will deliver the DCC locomotive, which must be supplied by Antics, with a plug equipped decoder fitted and tested. Allow a few extra days for delivery.
We cannot fit decoders to non-DCC Ready locomotives or N gauge models at this time.
Terms and Conditions Apply. Service normally available to web customers and at some shops. Please ask staff in store.
£15.00
Available to buy.
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4 pin decoder for DCC fitted 0-6-0 locomotives and the new Sentinel. A unique decoder for smaller locos with restricted space.
R7274 replaces the previous X9659 'spare' code for the Hornby 4-pin decoder.
£20.49

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(Product Ref 1945)
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DCC decoder for Bachmann class 90 electric locomotives with functions programmed to operate the servo-controlled pantograph.
£44.95

Must be ordered - delivery as soon as possible.
(Product Ref 30906)
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Bachmann 36-557 provides a basic technology decoder with the 21-pin socket type connection, ready to fit onto the 21 pin connectors. These are becoming more widely used, especially in OO diesel locomotives from Bachmann and Dapol. The decoder has one blank hole (the missing 22nd pin), ensuring correct orientation every time. Usually the decoder will fit flat just above the main control board, no wires to be tucked away during as the body is refitted!
This decoder provides a 1 amp power output with configurable high-frequency pulse-width modulation back-EMF motor control for smooth running and configurable speed curves. Shunting speed fucntionality allows the maximum speed to be halved for accurate speed control during slow running and shunting. Four function controls are available with a maximum 350mA combined output.
Decoder measures 25mm long, 15.5mm wide with socket at one end.
£39.95

Must be ordered - delivery as soon as possible.
(Product Ref 123724)
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Bachmann Wiring Harness with Socket for 8-Pin DCC Decoder 36-564
Ideal for fitting decoder sockets to older locomotives not equiped with a socket without the risk of accidentally blowing the decoder during soldering.
This wiring harness has fittings to connect an 8-pin decoder.
£8.95

Must be ordered - delivery as soon as possible.
(Product Ref 78062)
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The DCC90 is a large 8 pin decoder which is fitted with a removable 25mm harness including 2 function wires. Fitted in the decoder is a small 2 pin socket which can have the PowerPal inserted into it (sold separately), This helps keep the locomotive moving in dirty or dead track sections.
Length 21mm, Width 16mm, Thickness 4mm.
£26.00

Must be ordered - delivery as soon as possible.
(Product Ref 125536)
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The DCC92 is a 8 pin decoder with a fitted 45mm harness between the pins and the decoder. An ideal decoder for retrofitting into non DCC Ready locomotives.

Length 12mm, Width 10mm, Thickness 3mm Harness Length 45mm.
£26.00

Must be ordered - delivery as soon as possible.
(Product Ref 125537)
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The DCC95 is a direct plug 21 pin decoder. Fitted in the decoder is a small 2 pin socket which can have the PowerPal inserted into it (sold seperately), This helps keep the locomotive moving in dirty or dead track sections.
Length 21mm, Width 16mm, Thickness 4mm.
£37.50

Must be ordered - delivery as soon as possible.
(Product Ref 117868)
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The DCC99 is the PowerPal and is designed to keep your locomotives running through dirty or dead track sections. Once a bad bit of track is detected the capacitors kick in and keep the motion, lights and sounds alive until power is restored. The time period can change depending on the decoder that the PowerPal is fitted to.
Length 40mm, Width 14mm, Thickness 8mm, Harness Length 110mm.

£27.50

Must be ordered - delivery as soon as possible.
(Product Ref 125304)
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Part of the innovative new HM7000 range, this 6-pin Bluetooth® and DCC decoder is perfect for getting smaller locomotives working on the HM7000 system.

HM7000 decoders use the Bluetooth data communications system available on most mobile telephones and similar 'smart devices' to receive control signals. The decoders can be powered by track AC power from a DCC system or from a straight 15V AC power supply transformer unit.
NB Hornby have encountered issues with running HM7000 decoders from DC power supplies so currently the use of a DC supply is not recommended.
£31.99

Must be ordered - delivery as soon as possible.
(Product Ref 120854)
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The HM7040 Bluetooth® Legacy Dongle allows the HM | DCC app to work with older DCC Controllers from Hornby.
Add Bluetooth and Smartphone/tablet control to your existing Hornby DCC Controllers! The dongle works with all Hornby DCC decoders - including the Elite, Select and Railmaster. This will allow the HM | DCC app to control of all your previous non-Bluetooth decoders.
The Legacy Dongle works via the XpressNet socket - this is a common socket included in many other brands of DCC Controller, however, Hornby are unable to confirm if the Dongle will work seamlessly with other brands of controller.

£39.99

Must be ordered - delivery as soon as possible.
(Product Ref 120862)
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This module functions as a HM7000 compliant version of the reverse loop module, allowing layouts with single track sections to be built, such as a figure of 8 style layout.
£35.99

Must be ordered - delivery as soon as possible.
(Product Ref 120863)
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Part of the innovative new HM7000 range, this 8-pin Bluetooth® and DCC decoder is perfect for 8-pin DCC ready locomotives, to get them working on the HM7000 system.

HM7000 decoders use the Bluetooth data communications system available on most mobile telephones and similar 'smart devices' to receive control signals. The decoders can be powered by track AC power from a DCC system or from a straight 15V AC power supply transformer unit.
NB Hornby have encountered issues with running HM7000 decoders from DC power supplies so currently the use of a DC supply is not recommended.
£39.99

Must be ordered - delivery as soon as possible.
(Product Ref 120855)
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Functioning as a stay-alive, the HM7070 power bank will keep locomotives running over any potential dead spots.
Offers up to 9 seconds of backup power.
£15.99

Next Warehouse Delivery: Dec 24
Must be ordered - delivery as soon as possible.
(Product Ref 120864)
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Part of the innovative new HM7000 range, this Next18-pin Bluetooth and DCC decoder is perfect for Next18-pin DCC ready locomotives, to get them working on the HM7000 system.


HM7000 decoders use the Bluetooth data communications system available on most mobile telephones and similar 'smart devices' to receive control signals. The decoders can be powered by track AC power from a DCC system or from a straight 15V AC power supply transformer unit.
NB Hornby have encountered issues with running HM7000 decoders from DC power supplies so currently the use of a DC supply is not recommended.
£44.99

Must be ordered - delivery as soon as possible.
(Product Ref 120857)
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To place an order please call 01453 377030
Part of the innovative new HM7000 range, this 21-pin Bluetooth and DCC decoder is perfect for getting newer 21-pin locomotives working on the HM7000 system.

HM7000 decoders use the Bluetooth data communications system available on most mobile telephones and similar 'smart devices' to receive control signals. The decoders can be powered by track AC power from a DCC system or from a straight 15V AC power supply transformer unit.
NB Hornby have encountered issues with running HM7000 decoders from DC power supplies so currently the use of a DC supply is not recommended.
£44.99

Must be ordered - delivery as soon as possible.
(Product Ref 120859)
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To place an order please call 01453 377030
Have a question? Contact us
Locomotives on DCC layouts require a decoder to be fitted to control the motor direction and speed. Additional functions are available on most decoders, usually function 0 being used for directional lighting.
DCC Ready locomotives are fitted with a plug-in socket for a decoder, check which type is needed for your locomotive, usually this is shown on the end of the box and operators leaflet.

Sockets for 8 pin decoders were commonly fitted to OO and HO gauge models. Heljan and Hornby models still currently use this socket.
For N gauge a smaller 6-pin socket was designed, along with a small-sized decoder. Bachmann Graham Farish and Dapol N gauge models have 6-pin decoder sockets. Recently Bachmann have designed small OO locomtoives (eg the BR 03 shunter) with sockets for 6 pin decoders.
21-pin connectors are increasingly common in OO models by Bachmann and Dapol

Locomotives without a socket can be fitted with decoders or fitted with a socket by re-wiring the locomotive and soldering the decoder wires in the circuit. Reference to the Peco Shows You How booklet is recommended for guidance.

Sound decoders have their own section - click to transfer.