LDT DigitalBooster DB-4 User manual

L ittfinski D aten T echnik ( LDT )
Multi-Digital
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.
Schraube
screw
DB-4-Basis
Distanzbolzen
distance spacer
DB4-Power
Schraube
screw
DB4-Power
Rev. 1.4
Littfinski DatenTechnik (LDT)
IC4 IC5
ST1
C3
R6
R5
D7
D5
C11
R1
D3
D2
IC1 R3
C4
C7 C8
C1 C2
C10 IC3 C9
D6
C6
R2 IC2
D1
D4
R4
C5
T1
T3 T4
T2
13 5 7 9 11 13 15 17 19
2 4 6810 12 14 16 18 20
JP5
2,5 4,5
ShortReport
RailCom
GoAuto
ON OFF
JP4 JP3 JP2 JP1
MMDCC
BU1
DB-4
Rev. 1.4
JK
Littfinski DatenTechnik (LDT)
+
STOPGO
LED2LED1
red brown
S1
+
KL3KL4KL2
STOP/GO
EDC
BU2 BU3
ST2ST1
IN OUT
Feedback
A
T
KL1
Picture 1 Picture 2
DigitalBooster DB-4
from the Digital-Professional-Series !
DB-4-B Part-No.: 080071
>> kit <<
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,
mfx
®
, M4 and DCC.
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.
CE Part-No.:
1370364
Made in Europe by
Littfinski DatenTechnik (LDT)
Bühler electronic GmbH
Ulmenstraße 43
15370 Fredersdorf / Germany
Phone: [phone] / 867-0
Internet: www.ldt-infocenter.com
Subject to technical changes and errors. 07/2019 by LDT
Märklin, Motorola and mfx are registered trademarks.
Assembly Instruction

Introduction:
You have purchased a kit for your model railway supplied within the assortment of
Littfinski DatenTechnik (LDT). These kits are of high quality and easy to assemble.
We are wishing you having a good time for assembling and application of this
product!
General:
Tools required for the assembly
Please assure that the following tools are available:
•a small side cutter
•a mini soldering iron with a small tip
•solder tin (if possible 0.5mm diameter)
Safety Instructions
•All electrical and electronic components included in this kit shall be used on low voltage
only by using a tested and approved voltage transducer (transformer). All components
are sensitive to heat. During soldering the heat shall be applied for a very short period
only.
•The soldering iron develops a heat up to 400°C. Please keep continual attention to this
tool. Keep sufficient distance to combustible material. Use a heat resistant pad for this
work.
•This kit contains small parts which can possibly be swallowed from children. Children
(especially under 3 years) shall not participate on the assembly without supervision.
Assembly List:
Pos. Qty. Components Remarks Ref. Done
1 1 Printed circuit board DB-4 Rev. 1.4
2 2 Resistors 0,1 Ohm Marked: "R10" R1, R2
3 1 Resistor 10 Ohm brown-black-black-gold R3
4 1 Resistor 100 Ohm brown-black-black-black R4
5 1 Resistor 180 Ohm brown-gray-black-black R5
6 2 Resistors 220 Ohm red-red-black-black R6, R7
7 1 Resistor 330 Ohm orange-orange-black-black R8
8 1 Resistor 470 Ohm yellow-violet-black-black R9
9 1 Resistor 1 KOhm brown-black-black-brown R10
10 1 Resistor 2,2 KOhm red-red-black-brown R12
11 2 Resistors 3,3 KOhm orange-orange-black-brown R13, R14
12 2 Resistors 4,7 KOhm yellow-violet-black-brown R15, R16
13 4 Resistors 10 KOhm brown-black-black-red R11,R18...R20
14 1 Resistor 12 KOhm brown-red-black-red R21
15 1 Resistor 27 KOhm red-violet-black-red R22
16 3 Resistors 47 KOhm yellow-violet-black-red R17,R23,R24
17 1 Resistor 1 MOhm brown-black-black-yellow R25
18 1 Network 5*10 KOhm attend to polarity! RN1
19 10 Diodes 1N4003 attend to polarity! D1...4, D6...11
20 3 Diodes 1N5819 attend to polarity! D5, D12, D13
21 1 Z-Diode BZX ... 5V1 attend to polarity! D14
22 1 Z-Diode BZX ... 30V attend to polarity! D15
23 1 IC-socket 28poles attend to polarity marking! IC1
24 3 IC-sockets 8poles attend to polarity marking! IC2, 3, 5
25 1 IC-socket 16poles attend to polarity marking! IC7
26 1 IC: LTV814 attend to polarity! IC6
27 1 DC-DC Converter attend to polarity! IC4
28 1 Resonator 8MHz CR1
29 5 Capacitor 100nF 100nF = 104 C1...C5
30 1 Tantalum cap. 1uF/35V 1uF = 105; attend to polarity! C6
31 3 Tantalum cap. 10uF/10V 10uF = 106; attend to polarity! C7...C9
32 4 Electrolytic cap. 470uF/35V attend to polarity! C10...C13
33 1 Storage choke L1
34 1 DC-socket BU1
35 2 Sockets 4poles BU2, BU3
36 1 Socket bar 2x10poles BU4
37 1 Pin bar 2x5poles JP1 ... JP5
38 5 Jumpers set on pin bar 2x5poles JP1 ... JP5
39 2 Pin bars 5poles ST1, ST2
40 1 Push button S1
41 1 LED green plus distance sleeve attend to polarity! LED1
42 1 LED red plus distance sleeve attend to polarity! LED2
43 1 Clamp 2poles KL1
44 3 Clamps 2poles and 3poles build block prior to assembly KL2 ... KL4
45 1 IC: ATMEGA168-20 attend to polarity! IC1
46 1 IC: LM2574HVN-5 attend to polarity! IC2
47 1 IC: LM393 attend to polarity! IC3
48 1 IC: HCPL2631 attend to polarity! IC5
49 1 IC: LTV847 attend to polarity! IC7
50 4 Cross headed screws M3x6 for assembly "DB4-Power"
51 2 Distance spacer 18mm for assembly "DB4-Power"
52 1 DB4-Power assembly acc. instruction
53 final control
Set-Up:
For the board assembly please follow exact the sequence of the above assembly list.
Cross each line off as done after completing the insertion and the soldering of the
respective part.
For the diodes please keep special attention the correct polarity (marked line for the
cathode).
With reason to different makes of electrolytic capacitors you will find different markings
of the polarity. Some are marked with "+" and some are marked with "-". Each capacitor
has to be assembled to the board that the marking on the capacitor is in correspondence
with the marking on the pc-board.
For tantalum capacitors please attend to the connection wire marked "+". This wire has
to correspond to the printed mark on the pc-board.