velleman K4003 2 X 30W Stereo Amplifier User Manual

: June 8, 2024
: Velleman

Table of Contents

Features & Specifications
Assembly (Skipping this can lead to troubles
Construction
References
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velleman K4003 2 X 30W Stereo Amplifier User Manual

Features & Specifications

Features:
This small amplifier is constructed with the TDA2616 IC, with a maximum supply capability of 2 x 15Wrms (4ohm) of 2 x 10Wrms (8ohm). The IC is thermally and short-circuit protected. Additional rectifier and smoothing filter are unnecessary, as alternating current can be directly connected to the unit.

Specifications :

Music power output: 2 x 30W / 4ohm
RMS output: 2 x 15Wrms / 4ohm or 2 x 10Wrms / 8ohm
Total harmonic distortion: 0.07% (1W / 1kHz)
Channel separation: 70dB
Frequency response: 7Hz to 60kHz (-3dB)
Signal-to-noise ratio: 98dB (A weighted)
Input sensitivity: 300mV / 150Kohm
Transient suppression on/off switch
Overload and short-circuit protection: max. 1h
Supply voltage: 2 x 12Vac / 2A (50W transfo recommended)
Dimensions: 70 x 50mm
Recommended transformer: 212048 or 8012

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.
Assembly

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 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

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.

Soldering Hint

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 possible to the solder joint

REMOVE THEM FROM THE TAPE ONE AT A TIME !

DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE. ALWAYS CHECK THEIR VALUE ON THE PARTS LIST!

Construction

Resistors
R1 : 8,2 (8 – 2 – B – B)
R2 : 8,2 (8 – 2 – B – B)
Diodes. Watch the polarity
D1 : 1N5404
D2 : 1N5404
D3 : 1N5404
D4 : 1N5404
Capacitors.
C1 : 22nF (223)
C2 : 22nF (223)
C3 : 100nF (104)
PCB tabs
GND: Left
IN: Right
GND
LS (2x) : LS
GND (2x)
VA
ND : Mains
VB
Capacitors.
C4 : 1µF
C5 : 1µF
Electrolytic Capacitors. Watch the polarity
C6 : 2200µF
C7 : 2200µF
IC
IC1 : TDA2616

Mount the IC with the metal back pointing at the edge of the circuitboard. Mount it sufficiently high, so that the pins do NOT need to be pruned. Then mount the IC against the heatsink, as indicated in the diagram 1.0. The insulation (covered on both sides with some optional heat conductive paste, ordernr.: therm20) mica must be inserted between the IC and the heatsink.
PRODUCT OVERAWE

Connection
Make the connections as indicated in figure 2.0 & fig 3.0. Watch the polarity of the loudspeakers. If a ring-core transformer is used, it is possible that the OV (GND) connection consists of two leads. Finish all connections before switching on the power.

HOW TO CONNECT A VOLUME CONTROL HOE EEN VOLUMEREGELING AANSLUITEN OOMMENT ER ANCHER UN REGLAGE VOLUME
PCB layout
Diagram