LDT Digital-Professional Series Assembly Instruction

Light emitting diodes have to be assembled that the long wire of the diode corresponds
to the mark "+" of the pc-board. Before assembly please slip the distance spacer onto
the connection wires.
The resistor-network RN1 is marked at one end for the assembly position with "...103..."
and additionally with a printed circle or a square. Assemble this component that way that
the marking corresponds with the marking at the first bore of the pc-board. Additionally is
the first bore marked with "1".
Integrated circuits (IC`s) are either marked with a half round notch on one end or a
printed point for the correct mounting position. Push the IC`s into the correct socket
assuring that the notch or the printed point is corresponding to the half-rounded marking
on the pc-board. The 4-poles integrated circuit LTV814 (IC6) shall be soldered directly
onto the pc-board.
Please attend to the sensitivity of the ICs to electrostatic discharge, which will cause
immediate damage of the IC. Before touching those components please discharge
yourself by contacting an earthed metal (e.g. earthed radiator) or work with an
electrostatic safety pad.
Assembly of the DB4-Power PC-Board:
After completing the DB-4 basic pc-board you can assemble the SMD-pre-assembled
and tested DB4-Power PC-Board.
Firstly please tighten the two distance spacer to the basic pc-board with two of the four
cross section screws.
Apply now the DB4-Power PC-Board into the socket bar BU4 of the basic pc-board. Pay
attention that there is no offset of the DB4-Power PC-Board to the socket. The DB4-
Power PC-Board is in correct position at the socket bar BU4 of the basic pc board if you
can screw the DB-Power PC Board to the distance bolts.
The following picture 1 show the assembly procedure from the side view and the picture
2 show the assembled DB4-Power-PC Board onto the basic PC-Board with sight from
the top.
Picture 1
Schraube
screw
2 4 6 8 10 12 14 16 18 20
IC4 IC5
C1
DB4-Power
D7
1 3 5 7 9 11 13 15 17 19
C7 C8
C3
C10 IC3
T1
D5 T2
D6
R6
C6
C11
R5
R1
R2
D3
D4
D2
Distanzbolzen R4
R3
IC1
distance spacer
DB4-Power
C5
C4
Rev. 1.4
T3 T4
Littfinski DatenTechnik (LDT)
DB-4-Basis
KL2 KL4 KL3
DB-4
Rev. 1.4
ST1 ST2
A C D E STOP/GO IN OUT
Feedback
Schraube
screw
Picture 2
L D
ittfinski aten
Assembly Instruction
The DigitalBooster DB-4 is a short-circuit-proofed power
amplifier (booster) for digital model railway layouts.
It provides a maximum digital current of 2.5 or 4.5 Ampere.
The DB-4 amplifies the digital formats of Märklin-Motorola,
The DB-4 can operate on several digital command stations by
using the 5-poles booster bus, the CDE-booster bus or the
Roco-booster bus.
The DigitalBooster DB-4 receives the power supply not from a
classical model railway transformer but from the switched
mode mains power supply DB-4 PowerSupply. On this unit is
the stabilized digital track voltage adjustable between 15 and
24 Volt, suitable for all track gauges.
This product is not a toy! Not suitable for children under 14 years. Improper use will imply danger or injuries due
to sharp edges and tips! Please store this instruction carefully.
C2
C9
Multi-Digital
IC2
D1
T LDT
echnik ( )
DigitalBooster DB-4
from the Digital-Professional-Series !
DB-4-B 080071
Part-No.:
>> kit <<
®
mfx , M4 and DCC.
CE Part-No.:
1370364
Subject to technical changes and errors. © 07/2019 by LDT
Märklin, Motorola and mfx are registered trademarks.
Made in Europe by
Littfinski DatenTechnik (LDT)
Bühler electronic GmbH
Ulmenstraße 43
15370 Fredersdorf / Germany
Phone: +49 (0) 33439 / 867-0
Internet: www.ldt-infocenter.com