Velleman K8040 User Manual

Total solder points: 299
Difficulty level:

beginner 1o 2o 3o 4o 5þ advanced

HIGH-END mono mosfet power

amplifier

K8040

8040

Mosfet Power Amplifier

On

Temp. error

Clip/Auto power

ILLUSTRATED ASSEMBLY MANUAL H8040IP-1

VELLEMAN COMPONENTS

Legen Heirweg 33

9890 Gavere

Belgium

http://www.velleman.be

Assembly hints

0.000

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

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 draw-

ings.

⇒ Values on the circuit diagram are subject to changes.
⇒ Values in this assembly guide are correct*

3

Assembly hints

⇒ 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 :

1- Mount the component against the PCB sur-

face and carefully solder the leads

2- Make sure the solder joints are cone­shaped and shiny

3- Trim excess leads as close as possible to the
solder joint

AXIAL COMPONENTS ARE TAPED IN

THE CORRECT MOUNTING SEQUENCE !

REMOVE THEM FROM THE TAPE ONE AT A

TIME !

4

5%

4K7= ( 4 - 7 - 2 - B )

1%

4K7= ( 4 - 7 - 0 - 1 - 1 )

COLOR= 2… 5

C

O

D

KODE

KLEUR

CODIFI-

CATION

DES

CODE

COLOUR

FARB

KODE

KODE

FARGE-

KODE

FARVE-

Color code table

E

COU-

I P E SF S DK N D GB F NL

FÄRG

SCHEMA

VÄRI

KOODI

ORES

CODIGO

DE COL-

DE

CORES

CODIGO

CODICE

COLORE

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 Encar- Rojo Punainen Röd Rød Rød Rot Red Rouge Rood 2

3 Aran- Laranja Naran- 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 Bleu 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

5

Construction

CATHODE

ZD...

CONSTRUCTION

The unit consists of one main PCB with all the components including trans­former and power supply.

FTip: The pictures on the packaging can be used as a guideline.

However, due to possible modifications they are not 100% reliable.

Mount the components in the order described:

1. Jump wire

q J1
q J2
q J3
q J4
q J5
q J6
q J7
q J8

2. Diodes (check the polarity)

CATHODE

q D1: 1N4148
q D2: 1N4148
q D3: 1N4148
q D4: 1N4148
q D5: 1N4148
q D6: 1N4148
q D7: 1N4148
q D8: 1N4148

D...

3. Zener diode (check the polarity)

q ZD1: 20V / 1.3W (Mount 5mm

above the PCB)

4. Resistors (check the color code)

R...

q R1: 1K (1-0-2)
q R2: 1K (1-0-2)
q R3: 15K (1-5-3)
q R4: 1K (1-0-2)
q R5: 470R (4-7-1)
q R6: 100R (1-0-1)
q R7: 15K (1-5-3)
q R8: 15K (1-5-3)

6

Construction

q R9: 15K (1-5-3)
q R10: 15K (1-5-3)
q R11: 470R (4-7-1)
q R12: 15K (1-5-3)
q R13: 15K (1-5-3)
q R14: 100R (1-0-1)
q R15: 15K (1-5-3)
q R16: 2K2 0.6W (2-2-2-9)
q R17: 100R (1-0-1)
q R18: 1K (1-0-2)
q R19: 470R (4-7-1)
q R20: 2K2 0.6W (2-2-2-9)
q R21: 1M (1-0-5)
q R22: 470R (4-7-1)
q R23: 1K (1-0-2)
q R24: 470K (4-7-4)
q R25: 470K (4-7-4)
q R26: 470K (4-7-4)
q R27: 100K (1-0-4)
q R28: 2K2 0.6W (2-2-2-9)
q R29: 2K2 0.6W (2-2-2-9)
q R30: 0R (-0-)
q R31: 15K (1-5-3)
q R32: 100K (1-0-4)
q R33: 100R (1-0-1)
q R34: 0R (-0-)
q R35: 680R (6-8-1)
q R36: 15K (1-5-3)
q R37: 100K (1-0-4)
q R38: 470R (4-7-1)
q R39: 10R / 1W (1-0-0)
q JGND: 0R (-0-)

If long input signal wires are used a
low input impedance can be useful.
In this case mount for RX a 680R (6­8-1) resistor. Check if your pre­amplifier can drive low impedance!
Our K8021 is OK for low impedance.
Our K8020 is not suited for low im­pedance driving.

Rx is normally left open.

5. Multilayer capacitors

c...

q C1: 100n (104, 0.1, u1)
q C2: 100n (104, 0.1, u1)
q C3: 100n (104, 0.1, u1)
q C4: 100n (104, 0.1, u1)
q C5: 100n (104, 0.1, u1)
q C6: 100n (104, 0.1, u1)
q C7: 100n (104, 0.1, u1)
q C8: 100n (104, 0.1, u1)

6. IC sockets (check the position)

q IC1: 8P
q IC2: 8P
q IC3: 6P

7. 10W resistor

R...

5mm

q R40: 4R7 (4.7, 4R7)

7

Construction

8. Capacitors

q C9: 2n2 (222, 2200)
q C10: 220n (.22, u22, 224)
q C11: 1uF
q C12: 1uF
q C13: 2.2uF
q C14: 2.2uF
q C15: 100n / 250V (104, 0.1, u1)
q C16: 100n / 250V (104, 0.1, u1)

9. Transistors

q T1: BC547
q T2: BC547

10. RCA connectors.
Mount them straight and
against the PCB

q SK1: MJ-523AG/R
q SK2: MJ-523AG/B

Tip:
A red and a black type are delivered
with the kit, if you bought two amplifi­ers for stereo then one amplifier can
be built with red connectors (right
amp.) and one with the black connec­tors.

11. Push button
Mount them straight against
the PCB surface !

q SW1: TS-04PV

q SW2: KRS1243

8

Construction

12. Terminal blocks

q SK3: 3 pole Mains in
q SK4: 3 pole Mains transformer

q SK5+SK6: 2x 2 pole Transformer

output

F First slide these two connec-

tors in each other.

13. Terminal connectors

Check that the position corresponds
with the PCB silk printing.

q SK7: 2 pole Temp sensor
q SK8: 2 pole Power meter

q SK9: LS+
q SK10: LS-

SK...

9