Velleman K4001 User manual

7W mono amplifier
K4001
ILLUSTRATED ASSEMBLY MANUAL H4001IP-1
Total solder points: 33
Difficulty level: beginner 12345 advanced
Smallbutpowerful
multipurposeamplifier.

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Features:
This small amplifier is constructed around the TDA2003 IC, capable of delivering 4Wrms at 4ohms. The IC is completely
thermally and short-circuit protected. A conventional direct current can be connected as supply.
Specifications :
 Music output power : 7W/4ohm
 RMS output power : 3.5W/4ohm or 2W/8ohm
 Total harmonic distortion : 0.05% (1W/1KHz)
 Frequency response : 20Hz-20KHz (-3dB)
 Input sensitivity : 40mV/150Kohm
 Signal/noise ratio : 86dB (A weighted)
 Power supply : 8-18VDC/0.5A
 Dimensions : 55x35mm (2.2” x 1.4”)
Features & Specifications

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Assembly hints
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 oftenon a wet sponge or cloth, to keep it clean; then apply solder to the tip, togive it a wet look. This is called ‘thinning’ and will
protect the tip, and enables you to make goodconnections. When solder 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
cannot 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 :
⇒ Make sure the skill level matches your experience, to avoid disappointments.
⇒ Follow the instructions carefully. Read and understand the entire step before you perform each operation.
⇒ Perform the assembly in the correct order as stated in this manual
⇒ Position all parts on the PCB (Printed Circuit Board) as shown on the drawings.
⇒ Values on the circuit diagram are subject to changes.
⇒ Values in this assembly guide are correct*
⇒ Use the check-boxes to mark your progress.
⇒ Please 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.
0.000

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Assembly hints
1.3 Soldering Hints :
1- Mount the component against the PCB surface and carefully solder the leads
2- Make sure the solder joints are cone-shaped and shiny
3- Trim excess leads as close as possible to the solder joint
REMOVE THEM FROM THE TAPE ONE AT A TIME !
AXIAL COMPONENTS ARE TAPED IN THE CORRECT
MOUNTING SEQUENCE !
You will find the colour code for the resistances and the LEDs in the HALG
(general manual) and on our website: http://www.velleman.be/common/service.aspx

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 R1 : 470 (4 - 7 - 1 - B)
 R2 : 4,7 (4 - 7 - B - B)
 R3 : 100 (1 - 0 - 1 - B)
1. Resistors. R...
Construction
 C1 : 8n2 (822)

C2 : 100nF (104)
 C3 : 100nF (104)
3. Capacitors.
 C4 : 10µF

C5 : 470µF
 C6 : 1000µF

C7 : 1000µF
5. Electrolytic Capacitors.
Watch the polarity !
C...
 IN
 GND
 LS
 GND
 +V
 GND
4. PCB tabs
 R4 : 1 (1 - 0 - B - B - 9)
2. Metal film resistor.
R...
 IC1 : TDA2003!
6. IC.

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Supply connection
7. Supply connection
Fig. 1.0
Figure 1 is an example of a suitable mains supply for this circuit. Naturally, you can also use batteries to
power the circuit.
FUSE 1A T
FUSEHOLDER
TRANSFORMER
POWER SWITCH 240V 3A
MAINS
STRAIN RELIEF
12V AC 6VA
RECTIFIER BRIDGE
+-
1.5A 50V
ELECTROLYTIC CAPACITOR 2200µF 25V

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Volume control
Fig. 2.0
47K OHM LOG
GND
Signal IN
TO AMPLIFIER
SHIELDED CABLE
POTENTIOMETER
FROM SOURCE
GND
SIGNAL (+)
Adjust the volume by connecting a 47K logarithmic potentiometer as indicated in figure 2.0.
8. Volume control

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Connection example
Figure 3.0 is an example of a connection diagram of a 4 or 8 ohm speaker that is connected to the pins LS
and GND. The input signal should be connected with the IN and GND pins.
9. Connection example
4/8 OHM SPEAKER
+
-
8..18VDC / 0.5A
47K LOG POTENTIOMETER
+
-
-
+
FROM AUDIO SOURCE
Fig. 3.0

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10. PCB layout.
PCB

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11. Diagram
Diagram

Modifications and typographical errors reserved
© Velleman Components nv.
H4001IP - 2004 - ED1
VELLEMAN Components NV
Legen Heirweg 33
9890 Gavere
Belgium Europe
www.velleman.be
www.velleman-kit.com
5410329 289003