Velleman K2637 SUPER MINI 2.5W AUDIO POWER AMPLIFIER

Manual

Total solder points: 44

Skill level: Beginner [1] [2] [3] [4] [5] Advanced

Specifications:

☑ Max. output power: 2.5W (4Ω/12V)
☑ Frequency response: 60Hz - 15KHz
☑ Input sensitivity: 20-150mV selectable
☑ Thermal and short circuit protection
☑ Power supply: 4.5 - 15VDC /400mA
☑ Quiescent current: 12mA
☑ Dimensions: 42x32mm (1.65"x1.25")

modifications reserved

Applications:

☑ Small but powerful multi-purpose amplifier
☑ For use with portable audio equipment
☑ Power amplifier for audio projects
☑ In-car use
☑ Your own unique application

MANUAL H2637-ED1

Resistor Color Code Chart

Resistor code example: 4K7 = (4 - 7 - 2 - B) [5% tolerance]

Resistor code example: 4K7 = (4 - 7 - 0 - 1 - 1) [1% tolerance]

Resistor tolerance bands: COLOR = 2... 5

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

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 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.

Diagram showing essential tools for assembly: a soldering iron with a small tip, a wet sponge for cleaning the tip, a spool of thin raisin-core solder, diagonal wire cutters, needle-nose pliers, and small blade and Phillips screwdrivers. A multimeter is also shown as potentially useful.

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.

1.3 Soldering Hints:

Diagrams illustrating correct soldering techniques: 1. A component lead being soldered to a PCB surface, showing the component mounted close to the board. 2. A correctly formed solder joint, described as cone-shaped and shiny. 3. Excess component leads being trimmed close to the solder joint.

Component List:

1. RESISTORS

R1: 330K (3-3-4-B)
R2: 5K6 (5-6-2-B)
R3: 4E7 (4-7-B-B)

Illustrations of axial lead resistors with color bands.

2. ELECTROLYTIC CAPACITORS (Check the polarity)

C1: 1µF
C2: 1µF
C7: 100µF
C9: 10µF
C10: 1000µF

3. CAPACITORS

C3: 100pF (101)
C4: 100nF (0.1µF; μ1; 104)
C5: 1.8nF (182; 1800)
C6: 220nF (224; 0.22µ; µ22)
C8: 100nF (0.1µF; μ1; 104)

4. IC

IC1: TDA1015

Illustration of an integrated circuit (IC) with multiple pins, identified as TDA1015.

6. PCB TERMINALS

Illustration of PCB terminal connectors.

Connection Examples:

7. CONNECTION EXAMPLE LOW LEVEL INPUT

Diagram showing a dynamic microphone connected to the audio input (INL), a 4/8 Ohm speaker connected to the output (LS), a 4.5-15VDC power supply connected, and a jumper in place. The input is labeled 'Dynamic microphone'.

8. CONNECTION EXAMPLE HIGH LEVEL INPUT

Audio Sources: CD PLAYER, TAPE RECORDER, VIDEO RECORDER, COMPUTER

Diagram showing an audio source (CD Player, Tape Recorder, Video Recorder, Computer) connected to the audio input (INP), a 4/8 Ohm speaker connected to the output (LS), a 4.5-15VDC power supply connected, and no jumper in place. A volume control knob (47K ohm log) is shown connected to the input.

Volume Control: 47K ohm log

Diagrams:

9. PCB LAYOUT

Diagram showing the physical layout of components on the Printed Circuit Board (PCB) for the Velleman P2637. Component designators (R1, R2, R3, C1-C10, IC1, J1) are shown in their respective positions on the board.

10. DIAGRAM

Schematic diagram of the audio power amplifier circuit. It shows the integrated circuit (IC1, TDA1015) as the central component, connected to various resistors (R1, R2, R3), capacitors (C1-C10), input (INL, INP), output (LS), power supply (4.5...15VDC, GND), and a jumper (J1).

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