velleman K4003 2X30W Stereo Amplifier Instruction Manual

: October 30, 2023
: Velleman

Table of Contents

velleman K4003 2X30W Stereo Amplifier
Product Information
Product Usage Instructions
Features
Specifications
Assembly hints
Construction
Connection
PCB layout
Diagram
References
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velleman K4003 2X30W Stereo Amplifier

Product Information

The K4003 is a small stereo amplifier kit that uses the TDA2616 IC to provide a maximum power output of 2 x 15Wrms (4ohm) or 2 x 10Wrms (8ohm). The IC is protected against thermal and short-circuit damage, so there is no need for additional rectifier or smoothing filters. The amplifier has a frequency response of 7Hz to 60kHz (-3dB), a total harmonic distortion of 0.07% (1W / 1kHz), and a signal-to-noise ratio of 98dB (A weighted). It has overload and short-circuit protection for up to one hour and requires a supply voltage of 2 x 12Vac/2A (50W transformer recommended).

Product Usage Instructions

Step 1: Ensure that you have all the necessary tools, including a basic multi-meter.
Step 2: Assemble the kit by following the instructions carefully. Note any last-minute updates indicated as “NOTE” on a separate leaflet.
Step 3: Solder the components to the PCB surface, ensuring that the solder joints are cone-shaped and shiny. Trim excess leads as close as possible to the solder joint.
Step 4: Mount the IC with the metal back facing the edge of the circuit board. Insert insulation (covered on both sides with some optional heat-conductive paste, ordernr.: therm20) mica between the IC and the heatsink. Mount it sufficiently high so that the pins do not need to be pruned. Then mount the IC against the heatsink, as indicated in diagram 1.0.
Step 5: Make the connections as indicated in figure 2.0 & fig 3.0. Ensure that you 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.

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 the 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 transfer recommended)
Dimensions: 70 x 50mm
Recommended transformer: 212048 or 8012

Assembly hints

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.

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 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 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

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 circuit board. 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.

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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.

$velleman-K4003-2X30W-Stereo-Amplifier-fig- $14$$