Velleman K4003 User manual

Total solder points: 45
Skill level :
Beginner 1þ2o3o4o5oAdvanced
ILLUSTRATED MANUAL H4003P-ED1
2x30W STEREO AMPLIFIER K4003
Features:
þThe easy way to add quality stereo amplification to your project
þExcellent sound quality
þLow noise, low distortion
þShort circuit and overload protected (1h max.)
þOn-board rectifier and smoothing capacitor
þJust add a center tap transformer
þComplete with heatsink
Specifications :
þMax. output power : 2 x 15W/4 ohm -2 x 10W/8 ohm
þHarmonic distortion : 0.07% (1W/1kHz)
þChannel separation : 70dB
þFreq. response : 7Hz to 60kHz (-3dB)
þSignal/noise ratio : 98dB (A weight)
þInput sensitivity : 300mV / 20Kohm
þPower supply : 2 x 12V / 2A (50W centertap transformer)
þDimensions : 69 x 51mm / 2.7” x 2”
modifications reserved

5%
4K7= ( 4 - 7 - 2 - B )
1%
4K7= ( 4 - 7 - 0 - 1 - 1 )
COLOR= 2… 5
IPESF SDK NDGB FNL
C
O
D
E
CODICE
COLORE
CODIGO
DE
CORES
CODIGO
DE COL-
ORES
VÄRI
KOODI FÄRG
SCHEMA
FARVE
KODE FARGE KODE FARB KODE
COLOUR
CODE CODIFI-
CATION
DES
COU-
LEURS
KLEUR
KODE
C
O
D
E
0
Nero Preto Negro Musta Svart Sort Sort Schwarz Black Noir Zwart 0
1
Marrone Castanho Marrón Ruskea Brun Brun Brun Braun Brown Brun Bruin 1
2
Rosso Encarnado Rojo Punainen Röd Rød Rød Rot Red Rouge Rood 2
3
Aranciato Laranja Naranjado Oranssi Orange Orange Orange Orange Orange Orange Oranje
3
4
Giallo Amarelo Amarillo Keltainen Gul Gul Gul Gelb Yellow Jaune Geel 4
5
Verde Verde Verde Vihreä Grön Grøn Grønn Grün Green Vert Groen 5
6
Blu Azul Azul Sininen Blå Blå Blå Blau Blue Blue Blauw 6
7
Viola Violeta Morado Purppura Lila Violet Violet Violet Purple Violet Paars 7
8
Grigio Cinzento Gris Harmaa Grå Grå Grå Grau Grey Gris Grijs 8
9
Bianco Branco Blanco Valkoinen Vit Hvid Hvidt Weiss White Blanc Wit 9
A
Argento Prateado Plata Hopea Silver Sølv Sølv Silber Silver Argent Zilver A
B
Oro Dourado Oro Kulta Guld Guld Guldl Gold Gold Or Goud B

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3
1. Assembly (Skipping this can lead to troubles ! )
Ok, so we have your attention. These hints will help you to make this project successful.
Read them carefully.
1.1 Make sure you have the right tools:
•A good quality soldering iron (25-40W) with a
small tip.
•Wipe it often on a wet sponge or cloth, to keep
it clean; then apply solder to the tip, to give it a
wet look. This is called ‘thinning’ and will protect the tip, and enables you to make good connections. When sol-
der rolls off the tip, it needs cleaning.
•Thin raisin-core solder. Do not use any flux or grease.
•A diagonal cutter to trim excess wires. To avoid injury
when cutting excess leads, hold the lead so they can-
not fly towards the eyes.
•Needle nose pliers, for bending leads, or to hold components in place.
•Small blade and phillips screwdrivers. A basic range is fine.
For some projects, a basic multi-meter is required, or might be
handy
1.2 Assembly Hints :
þMake sure the skill level matches your experience, to avoid disappointments.
þFollow the instructions carefully. Read and understand the entire step before you perform each operation.
þPerform the assembly in the correct order as stated in this manual
þPosition all parts on the PCB (Printed Circuit Board) as shown on the drawings.
þValues on the circuit diagram are subject to changes.
þValues in this assembly guide are correct*
þUse the check-boxes to mark your progress.
þPlease read the included information on safety and customer service
* Typographical inaccuracies excluded. Always look for possible last minute manual updates, indicated as ‘NOTE’
on a separate leaflet.
1.3 Soldering Hints :
Mount the component against the
PCB surface and carefully solder the
leads
Make sure the solder joints are
cone-shaped and shiny Trim excess leads as close as pos- sible to the solder joint
0.000

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4
1. RESISTORS R...
qR1 : 8.2 (8 -2 -B -B)
qR2 : 8.2 (8 -2 -B -B)
2. DIODES (Watch the polarity !)
CATHODE
D...
qD1 : 1N5400 … 5408
qD2 : 1N5400 … 5408
qD3 : 1N5400 … 5408
qD4 : 1N5400 … 5408
3. PCB PINS
q5xGND, 2xLS, 2xIN, VA, VB
4. CAPACITORS
C...
qC1 : 22nF (223)
qC2 : 22nF (223)
qC3 : 100nF (104, µ1)
qC4 : 1µF (105)
qC5 : 1µF (105)
5. ELECTROLYTIC CAPACITORS
(Watch the polarity!)
C...
qC6 : 4700µF
qC7 : 4700µF
6. IC (Watch the position !)
25mm
1"
SILICON
GREASE
INSULATING MICA WASHER
qIC1 : TDA1521 or eq.

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5
7. CONNECTION EXAMPLE
+
+
+
+
-
-
-
-
0
12V
12V
L
R
RIGHT
INPUT
FROM
AUDIO
SOURCE
LEFT
INPUT
FROM
AUDIO
SOURCE
8. HOW TO CONNECT A VOLUME CONTROL POTENTIOMETER
47K ohm log
FROM CD-PLAYER, TUNER, MIXER, ... TO K4003 AMPLIFIER IN
GND

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9. POWER SUPPLY OPTIONS
VA
VA
VA
GND
GND
GND
GND
VB
VB
VB
12V
+
-
12V
+
-
MAINS
MAINS
TRANSFORMER : 2 x 12V 50VA
TRANSFORMER : 2 x 12V 50VA
RED
YELLOW
BLUE
GRAY
10. PCB LAYOUT

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11. DIAGRAM