DigitalBooster (for 2.5 or 4.5 Ampere) from the Digital-Professional-Series!

Amplification of the data formats Märklin-Motorola, mfx®, M4 and DCC.

The DigitalBooster DB-4 is a short circuit protected Power-Amplifier (Booster) for digital model railway layouts. It provides a digital current of up to 2.5 or 4.5 Ampere.

With the galvanic separated booster connections is it possible to connect the DigitalBooster DB-4 to several command stations.

The sample connection shows how to connect the DB-4 to the Central Station 2 with the “Kabel Booster 1m” via the 5-poles booster bus. An own isolated track section will be provided with up to 2.5 or 4.5 Ampere digital current.

Features of the DB-4

  • The DigitalBooster DB-4 amplifies the data formats Märklin-Motorola, mfx®, M4 and DCC.
  • The galvanic separated booster connections enables the application of the DigitalBooster DB-4 in connection with several command stations by using the 5-poles Boosterbus, the CDE-Boosterbus or the Roco-Boosterbus:
5-poles booster bus CDE-booster bus Roco-booster bus
Control Unit X
Central Station 1 X X
Central Station 2 X
Central Station 3 und 3 plus X
Mobile Station 2 with Track Box X
ECoS 1 (50000) X X
ECoS 2 (50200) X X
Intellibox 1 X X
IB-Basic X
Intellibox 2 X X
EasyControl / RedBox X X
DiCoStation X
KeyCommander X
Roco 10761 (multiMAUS) X
Roco 10764 (multiMAUS) X
Fleischmann 680801 (multiMAUS) X
Roco / Fleischmann multiZENTRALEpro X
Roco / Fleischmann z21 and Z21 X
Digikeijs Digicentral DR5000 X
PIKO SmartControl X
Lenz Digital plus LZ100 X
Lenz Digital plus LZV200 X
Viessmann Commander X X

  • The DigitalBooster DB-4 will not get the power supply from a common model railway transformer but from the DB-4 PowerSupply. This power supply provides a stabilized digital track current of 15, 16, 18, 20, 22, 24 Volt as required to the relevant track gauge. The 120VA DB-4-PowerSupply is suitable for the operation on mains voltage of 110 to 240 VAC and a frequency of 50 to 60 Hertz.

Further special features will provide a smooth operation not only for PC and Model Railway Software controlled Model railway layouts:

  • With a jumper (“Short Report”) can be the DigitalBooster DB-4 set to the function that a short circuit will be reported to the command station to initiate a switch-off of all boosters or switching off the single track section where the short circuit was reported from.
  • With the jumper (“Auto Go”) can be the DigitalBooster DB-4 set to the function that the unit will continuous check every 5 sec. if a short circuit will be present. If the short circuit will be solved the DigitalBooster DB-4 will supply the relevant track section with current again.
  • With a further Jumper is it possible to set the maximum digital output current of the DigitalBooster DB-4 to 2.5 or 4.5 Ampere.
  • The DigitalBooster DB-4 provides the possibility to switch-OFF and -ON the current at the tracks of the layout by external push buttons. This can be helpful if the stop button of the command station will be at a far distance by a critical situation.
  • If the model railway layout will be controlled by a PC-Model Railway Software is it possible to switch the track digital current ON or Off via the Digital Booster DB-4 if required with the Märklin-Motorola- or DCC-Commands.
  • Integrated WatchDog-Function: If the WatchDog-Function will be activated by the model railway software, the DB-4 will control additionally the PC and the command station. If the PC or the model railway software will not get in contact to the DB-4 every 5 seconds with a switch command is the software of the PC- or the command station crashed and the model railway software has no longer control about the model railway layout. To avoid that trains will travel non-controlled the DB-4 will switch in this case the rails off from power supply and all trains will be stopped.
  • The DigitalBooster-DB-4 provides a Feedback-Output for the Booster Management of the Model Railway Software to provide a report to the model railway software if presently a current will be supplied to the tracks or if the tracks at the booster section will be current free.
  • The DigitalBooster DB-4 is able to create the RailCom®-cutout within the DCC-Operation provided that the jumper “RailCom” has been inserted.
  • LDT-Components from the Digital-Professional-Series can operate on your digital layout without any problems.
  • The finished module in a case comes with 24 month warranty.
  • Each DigitalBooster DB-4 will be supplied with a detailed operating-/respectively assembly-instruction. Those instructions can be found within the next section.
  • You can purchase the DigitalBooster DB-4 as a kit (-B) or as a tested finished module in a case (-G). Suitable assembly material is available under Accessories.


Instructions regarding this article can be found here: Downloads DB-4.
Instructions for all LDT-Components can be found here: Overview Downloads.


Sample-connections regarding this article can be found here: Sample-Connections DB-4.
Sample-connections for all LDT-Components can be found here: Overview Sample-Connections.

Add to Wish List / Prices

Attention: Products can only be added to the Wish List, if you are registered as customer at the LDT WebShop or if you are initially registered by interest of our products.

Add to Wish List: DB-4-B (Part-No.: 080071): Short circuit protected DigitalBooster (2.5 / 4.5 Ampere) as a kit (84,90 €*).
Add to Wish List: DB-4-G (Part-No.: 080073): Short circuit protected DigitalBooster (2.5 / 4.5 Ampere) as a
finished module in a case (129,90 €*).

Add to Wish List: DB-4 PowerSupply (Part-No.: 000135): Power Supply for the Digital Booster DB-4 as a
finished module in a case (49,90 €*).

* All prices incl. VAT, plus Shipping.

To assure a good connection: Booster Bus Cable!

  • We supply the DigitalBooster DB-4 without booster bus cable. Please select a suitable cable from the below table.
For a connection via the 5-poles Booster bus e.g. with Märklin Control Unit, Central Station 1 and 2, DiCoStation, KeyCom and Intellibox, TWIN-CENTER, EasyControl, ECoS, Commander and further DigitalBooster DB-4 to each other.
Kabel Booster 1m
For a connection via the CDE-Booster bus e.g. Lenz Digital plus, Intellibox, IB-BASIC, IB-COM, TWIN-CENTER, EasyControl, ECoS and Commander.
There is no special booster bus cable required because the connection will be made individual by three single wires via the CDE clamps.
For a connection via the Roco-Booster bus with Roco 10761/10764, Fleischmann 680801, multiZENTRALEpro, z21/Z21, Digikeijs Digicentral DR5000 and several DigitalBooster DB-4 between each other.
Kabel Roco 1m

Subject to technical changes and errors.
Märklin and Motorola are registered trade marks.
**RailCom® is a registered trademark of Firma Lenz Elektronik, Giessen/Germany.
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