Velleman K8021 User Manual
Total solder points: 500
Difficulty level:
beginner 1o 2o 3o 4o 5þ advanced
HIGH-END CONTROL AMPLIFIER
K8021
ILLUSTRATED ASSEMBLY MANUAL H8021IP-1
VELLEMAN KIT NV
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
DE
CODIGO
COLORE
DE
CORES
CODIGO
CODICE
COLORE
C
O
D
S
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 Blue 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
CONSTRUCTION
The unit consists out of two PCB’s, one is the main PCB, P8021B and the other
is the left channel input section P8021L.
First we will start with the small P8021L, then we assemble the P8021B.
FTip: The pictures on the packaging can be
used as a guideline.
However, due to possible changes it is not
100% reliable.
1. Diodes (check the polarity)
D...
CATHODE
q D1: 1N4148
q D2: 1N4148
q D3: 1N4148
q D4: 1N4148
q D5: 1N4148
q D6: 1N4148
6
P8021L
2. Resistors (check the color code)
R...
q R1: 10K (1-0-3)
q R2: 10K (1-0-3)
q R3: 10K (1-0-3)
q R4: 10K (1-0-3)
q R5: 10K 1-0-3)
q R6: 10K (1-0-3)
q R7: 1K (1-0-2)
q R8: 330R (3-3-1)
Construction
3. Capacitors
C...
q C1: 220p (221)
q C2: 220p (221)
q C3: 220p (221)
q C4: 220p (221)
q C5: 220p (221)
q C6: 220p (221)
4- Reed relays (check the position
of the notch)
RY...
q RY1: VR05051AS or eq.
q RY2: VR05051AS or eq
q RY3: VR05051AS or eq
q RY4: VR05051AS or eq
q RY5: VR05051AS or eq
q RY6: VR05051AS or eq.
6. RCA connectors.
Mount them straight and
against the PCB
q SK1: MJ-523AG/B BLACK
q SK2: MJ-523AG/B BLACK
q SK3: MJ-523AG/B BLACK
q SK4: MJ-523AG/B BLACK
q SK5: MJ-523AG/B BLACK
q SK6: MJ-523AG/B BLACK
7. Pin connector. Mount it exactly
as indicated
5. transistors
q T1: BC557
q T2: BC557
q T3: BC557
q T4: BC557
q T5: BC557
q T6: BC557
q SK7: HDR20/26
7
Construction
P8021B Assembly
8
Construction
1. Jump wires
q J1... J25
2. Diodes (check the polarity)
D...
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
q D9: 1N4007
q D10: 1N4007
q D11: 1N4007
q D12: 1N4007
q D13: 1N4007
q D14: 1N4007
q D15: 1N4007
q D16: 1N4007
3. Zener diode (check the polarity)
ZD...
CATHODE
q ZD1: 20V / 0.6W
4. Resistors (check the color code)
R...
q R1: 10K (1-0-3)
q R2: 10K (1-0-3)
q R3: 10K (1-0-3)
q R4: 10K (1-0-3)
q R5: 10K (1-0-3)
q R6: 10K (1-0-3)
q R7: 10K (1-0-3)
q R8: 10K (1-0-3)
q R9: 47K (4-7-3)
q R10: 470R (4-7-1)
q R11: 620R/1% (6-2-0-0)
q R12: 33R (3-3-0)
q R13: 33R (3-3-0)
q R14: 390K/1% (3-9-0-3)
q R15: 33K/1% (3-3-0-2)
q R16: 1K (1-0-2)
q R17: 47K (4-7-3)
q R18: 470R (4-7-1)
q R19: 620R/1% (6-2-0-0)
q R20: 390K/1% (3-9-0-3)
q R21: 33K/1% (3-3-0-2)
9
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