Velleman POWER BLOCK K8081 User manual

Total solder points: 383

Difficulty level: beginner 123 4 5⌧advanced

POWERBLOCK - POWER AMPLIFIER

ILLUSTRATED ASSEMBLY MANUAL H8081IP-1

Thisamplifierisanidealset-upforactivespeakeruse.

K8081

Features & specifications

This power amplifier is an ideal set-up for active speaker use.

Build a high-quality system, using two (stereo) or more (surround) amplifiers.

Due to its auto switch-on, through input signal sensing, the unit can be installed

at almost any place.

Comes complete with enclosure and transformer.

Features :

 fully discrete design using Epitaxial Darlington transistors

 includes all connectors, transformer and enclosure

 overload and short-circuit protection

 DC error protection with LED indication

 automatic switch-on upon input signal sensing (automatic switch-off)

Specifications

• 200W music power @ 4 ohm load

• 100W rms power @ 4 ohm load @ 10%THD

• distortion: 0.02% @ 1KHz/10W

• damping factor: >800

• frequency response: 3Hz to 200KHz (-3dB)

• sensitivity: 0.6V rms

• signal to noise ratio: 115dB

• power supply: 235 or 115 Vac

• Auto sensing on time : 15min.

• dimensions: 195 x 180 x 60mm (7.7" x 7" x 2.4")

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 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 compo-

nents 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*

0.000

⇒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 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 !

Assembly hints

AXIAL COMPONENTS ARE TAPED IN

THE CORRECT MOUNTING SEQUENCE !

Construction

 R1 : 330 (3 - 3 - 1 - B)

 R2 : 220 (2 - 2 - 1 - B)

 R3 : 47 (4 - 7 - 0 - B)

 R4 : 3K3 (3 - 3 - 2 - B)

 R5 : 100 (1 - 0 - 1 - B)

 R6 : 22K (2 - 2 - 3 - B)

 R7 : 120 (1 - 2 - 1 - B)

 R8 : 2K2 (2 - 2 - 2 - B)

 R9 : 680 (6 - 8 - 1 - B)

 R10 : 3K3 (3 - 3 - 2 - B)

 R11 : 3K3 (3 - 3 - 2 - B)

 R12 : 10 (1 - 0 - 0 - B)

 R13 : 18K (1 - 8 - 3 - B - 9)

 R14 : 2K7 (2 - 7 - 2 - B - 9)

 R15 : 1K5 (1 - 5 - 2 - B)

 R16 : 47 (4 - 7 - 0 - B)

 R17 : 3K3 (3 - 3 - 2 - B)

 R18 : 680 (6 - 8 - 1 - B)

 R19 : 1K (1 - 0 - 2 - B)

 R20 : 220 (2 - 2 - 1 - B)

 R21 : 470 (4 - 7 - 1 - B)

 R22 : 470K (4 - 7 - 4 - B)

 R23 : 100K (1 - 0 - 4 - B)

 R24 : 1K (1 - 0 - 2 - B)

 R25 : 1M (1 - 0 - 5 - B)

 R26 : 470K (4 - 7 - 4 - B)

 R27 : 100 (1 - 0 - 1 - B)

 R28 : 15K (1 - 5 - 3 - B)

 R29 : 470K (4 - 7 - 4 - B)

 R30 : 100K (1 - 0 - 4 - B)

 R31 : 47K (4 - 7 - 3 - B)

 R32 : 2K7 (2 - 7 - 2 - B - 9)

4. 1/4W resistors.

R...

 J

1. Jump wires.

 D1 : 1N4148

 D2 : 1N4148

 D3 : 1N4148

 D4 : 1N4148

 D5 : 1N4148

 D6 : 1N4148

 D7 : 1N4148

 D8 : 1N4148

 D9 : 1N4007

 D10 : 1N4007

Mounting Diode D11 :

 D11 : 1N4007

 Mount D11.

2. Diodes (check the polarity)

CATHODE

D...

 ZD1 : 5V1

 ZD2 : 9V1

3. Zener diodes (check the polarity)

CATHODE

ZD...

Construction

 IC1 : 8p

 IC2 : 8p

 IC3 : 6p

5. IC sockets. Watch the position

of the notch!

 RV1 : 1K

Bias adjustment

6. Trim potentiometer

 T1 : BC640

 T2 : BC640

 T3 : BC639

 T4 : BC547

 T5 : BC557

 T6 : BC547

 T7 : BC547

8. Transistors

 Make sure that transistor T7 is

bent towards diode D11.

 Make sure that the transistor and

diode leads do not touch each

other.

 C1 : 47pF (47)

 C2 : 47pF (47)

 C3 : 1nF (102)

 C4 : 680pF (680)

 C5 : 680pF (680)

 C6 : 10nF (103)

 C7 : 10nF (103)

 C8 : 47nF (473)

 C9 : 100nF (104)

 C10 : 100nF (104)

 C11 : 100nF (104)

 C12 : 100nF (104)

7. Capacitors

c...

 R33 : 3K3 (3 - 3 - 2 - B)

 R34 : 560 (5 - 6 - 1 - B - 9)

 R35 : 10K (1 - 0 - 3 - B)

 R36 : 47K (4 - 7 - 3 - B)

 R37 : 1K (1 - 0 - 2 - B)

 R38 : 10K (1 - 0 - 3 - B)

 R39 : 1K (1 - 0 - 2 - B)

 R40 : 2K2 (2 - 2 - 2 - B)

 R41 : 10K (1 - 0 - 3 - B)

 LD4 : Power (red)

9. LEDs. Watch the polarity!

LD1

CATHODE

Construction

 GND : 1 pin

 TEST : 1 pin

 +40V : 1 pin

 T8 : 6 pins

 T9 : 6 pins

10. Pinheaders

 R42 : 0,47

 R43 : 0,47

12. 5W resistors

R...

2mm

 LS+

 LS-

 AC RED

 AC GREY

 AC YELLOW

 AC BLUE

13. Flat receptacles

SK...

 SK5 : IN

11. Male board wire connector

 LD1 : yellow (standby)

 LD2 : Blue (on)

 LD3 : red (check)

CATHODE

IMPORTANT

Mount these LED's exactly like in the

drawing, otherwise some LED's will

not fit correctly in the front panel.

 C13 : 10µF

 C14 : 10µF

 C15 : 10µF

 C16 : 47µF / 16V

 C17 : 100µF / 50V

 C18 : 100µF / 50V

 C19 : 220µF / 16V

 C20 : 220µF / 16V

 C21 : 220µF / 16V

 C22 : 470µF / 16V

14. Electrolytic capacitors.

Watch the polarity !

C...

7mm

CATHODE

+/-3mm

LD...

construction

Mount following diodes 15mm

above the PCB :

 D14 : 1N5404

 D15 : 1N5404

Mount following diodes 10mm

above the PCB :

 D12 : 1N5404

 D13 : 1N5404

15. Power diodes

(check the polarity)

CATHODE

D...

 RY1 : VR5V242C

( 24VDC - 5A - 2C)

16. Relay

 C23 : 3300µF / 50V

 C24 : 3300µF / 50V

17. Electrolytic capacitors.

Watch the polarity !

C...

Mount all 4 brackets,

fasten them using 6mm

M3 bolt + M3 nut

19.Brackets

brackets

 IC1 : LM258P

 IC2 : VK8081 (programmed PIC10F200-I/PG)

 IC3 : TIL111 or 4N27

18. IC's. Watch the position of the

notch!

20. ASSEMBLY OF THE UNIT

Assembly

• cut all connections to 1.5mm

 Make sure that the solder connections don't

touch the housing.

• fix rubber foot in center of PCB

Use the colour pictures on packaging as guideline

Max. 1.5mm

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