Velleman-Kit K8031 User manual

Total solder points: 625
Difficulty level: beginner 1 234 5 ⌧advanced
DIGITAL PC SCOPE
ILLUSTRATED ASSEMBLY MANUAL H8031P-1
K8031
K8031
Digitalstorageoscilloscoop,usingacomputer
anditsmonitortodisplaywaveforms.All
standardoscilloscopefunctionsareavailablein
theWindowsprogramsupplied.

2
Features & specifications
Features :
 1 channel
 input impedance: 1Mohm / 30pF
 frequency response: 0Hz to 12MHz (± 3dB)
 step markers for voltage, time and frequency
 vertical resolution: 8 bit
 auto setup function
 optically isolated from computer
 record and display of screens & data
 supply voltage: 9 - 10Vdc / 500mA
 dimensions: 230 x 165 x 45mm (9" x 6.5" x 1.8")
 weight: 400g (14oz)
Minimum system requirements:
• IBM compatible PC
• Windows 95, 98, ME, (Win2000 or NT possible)
• SVGA display card (min. 800x600)
• mouse
• free printer port LPT1, LPT2 or LPT3
• CD Rom player
Specifications
oscilloscope:
• timebase: 0.1µs to 100ms per division
• trigger source: CH1 or free run
• trigger level: adjustable per ½ division
• input sensitivity: 10mV to 3V per division
• record length: 4079 samples
• sampling frequency: 800Hz to 32MHz (Real time)
• true RMS readout (only AC component)
transient recorder:
• timescale: 20ms/div to 2000s/div
• max record time: 9.4hour/screen
• automatic storage of data
• automatic recording for more than 1 year
• markers for time and amplitude
• zoom function
spectrum analyser:
• frequency range: 0 .. 400Hz to 16MHz
• linear or logarithmic timescale
• zoom function

3
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

4
⇒ 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 !

5
Construction
The unit consists out of one main PCB with all the components
 Tip: The pictures on the packaging can be used as a guideline.
However, due to possible changes it is not 100% reliable.
Mount the components in the order described:
1. Diodes (check the polarity)
CATHODE
D...
 R1 : 150R (1-5-1)
 R2 : 470R (4-7-1)
 R3 : 150R (1-5-1)
 R4 : 47R (4-7-0)
 R5 : 150R (1-5-1)
 R6 : 91K (9-1-0-2) 1%
 R7 : 10K (1-0-3) 1%
2. Resistors (check the color code)
R...
 D1: BAS45A
 D2: BAS45A
 D3: 1N4148
 D4: 1N4148
 D5: 1N4148
 D6: 1N4148
 D7: 1N4148
 D8: 1N4148
 D9 : 1N4148
 D10: 1N4148
 D11: 1N4148
 D12: 1N4148
 D13: 1N4148
 D14: 1N4148
 D15: 1N4148
 D16: 1N4007
 R8 : 91K (9-1-0-2) 1%
 R9 : 3R3 (3-3)
 R10 : 910K (9-1-0-3) 1%
 R11 : 820R (8-2-0-0) 1%
 R12 : 2K2 (2-2-2)
 R13 : 820R (8-2-0-0) 1%
 R14 : 820R (8-2-0-0) 1%
 R15 : 820R (8-2-0-0) 1%
 R16 : 1K8 (1-8-2)
 R17 : 2K2 (2-2-2)
 R18 : 820R (8-2-0-0) 1%
 R19 : 10K (1-0-3) 1%
 R20 : 10K (1-0-3) 1%
 R21 : 10K (1-0-3) 1%
 R22 : 10K (1-0-3) 1%
 R23 : 10K (1-0-3) 1%
 R24 : 10K (1-0-3) 1%
 R25 : 10K (1-0-3) 1%
 R26 : 20K (2-0-0-2) 1%
 R27 : 20K (2-0-0-2) 1%
 R28 : 20K (2-0-0-2) 1%
 R29 : 20K (2-0-0-2) 1%
 R30 : 20K (2-0-0-2) 1%
 R31 : 20K (2-0-0-2) 1%
 R32 : 20K (2-0-0-2) 1%
 R33 : 20K (2-0-0-2) 1%
 R34 : 20K (2-0-0-2) 1%
 R35 : 470R (4-7-1)
 R36 : 2K2 (2-2-2)
 R37 : 2K2 (2-2-2)
 R38 : 2K2 (2-2-2)
 R39 : 100R (1-0-1)
 R40 : 150R (1-5-1)
 R41 : 2K2 (2-2-2)
 R42 : 2K2 (2-2-2)
 R43 : 10K (1-0-0-2)1%

6
Construction
 C1 : 100n (104, 0.1, u1)
 C3 : 100n (104, 0.1, u1)
 C6 : 100n (104, 0.1, u1)
 C8 : 100n (104, 0.1, u1)
 C9 : 100n (104, 0.1, u1)
 C12 : 100n (104, 0.1, u1)
 C13 : 100n (104, 0.1, u1)
 C18 : 100n (104, 0.1, u1)
 C19 : 100n (104, 0.1, u1)
 C21 : 100n (104, 0.1, u1)
 C24 : 100n (104, 0.1, u1)
 C25 : 100n (104, 0.1, u1)
 C27 : 100n (104, 0.1, u1)
 C28 : 100n (104, 0.1, u1)
 C29 : 100n (104, 0.1, u1)
 C30 : 100n (104, 0.1, u1)
 C31 : 100n (104, 0.1, u1)
 C32 : 100n (104, 0.1, u1)
 C33 : 100n (104, 0.1, u1)
 C34 : 100n (104, 0.1, u1)
 C36 : 100n (104, 0.1, u1)
 C38 : 100n (104, 0.1, u1)
 C39 : 100n (104, 0.1, u1)
 C40 : 100n (104, 0.1, u1)
 C41 : 100n (104, 0.1, u1)
 C45 : 100n (104, 0.1, u1)
3. Capacitors
c...
5. IC sockets
 C17 : 100p (101)
 C26 : 100p (101)
 C10 : 220p (221)
 C15 : 22p
 C16 : 22p
 C22 : 22p
 C42 : 22p
 C4 : 2n2 /100V (222, 2200)
 C20 : 2n2 / 100V (222, 2200)
 C14 : 2n7 (272, 2700)
 C5 : 47n/250V (0.047, 473)
4. Capacitors
C...
 IC1: 16P
 IC3: 8P
 IC4: 24P
 IC5: 28P
 IC6: 16P
 IC7: 16P
 IC8: 16P
 IC9: 16P
 IC10: 16P
 IC11: 16P
 IC12: 16P
 IC13: 24P
 IC16: 14P
 IC17: 16P
 IC18: 8P
 IC19: 8P
 IC20: 8P
 IC21: 8P
 IC14: 16P
 IC22: 8P
 R44 : 2K2 (2-2-2)
 R45 : 820R (8-2-0-0) 1%
 R46 : 1K8 (1-8-2)
 R47 : 100R (1-0-1)
 R48 : 100R (1-0-1)
 R49 : 100R (1-0-1)
 R50 : 470R (4-7-1)
 R51 : 470R (4-7-1)
 R52 : 470R (4-7-1)
 R53 : 3R3 (3-3) / 1W
 C47 : 100n (104, 0.1, u1)
 C48 : 100n (104, 0.1, u1)

7
Construction
 C2 : 4µ7
 C7 : 4µ7
 C11 : 4µ7
 C35 : 4µ7
 C37 : 4µ7
 C44 : 4µ7
 C23 : 100µF
 C43 : 100µF
 C46 : 100µF
6. Electrolytic capacitors. Check
the polarity !
C...
 T1 : BC327
7. Transistor
 RV1: 50R (R50, W500)
 RV2: 500R (R500, W501)
In doubt, measure using an ohm meter
between the two outer connections.
8. Multiturn trimmer
RV...
 CV1 : 22p (small type)
 CV2 : 50p
9. Trimmer capacitors
CV...
 X1: 32MHz
Check the position, refer to the PCB
lay out.
10. Oscillator
X...
 FS1: 1A pico
One spare fuse is also supplied
11. Pico fuse
FS...

8
 RY1 : VR05R051AS
 RY2 : VR05R051AS
 RY3 : VR05R051AS
 RY4 : VR05R051AS
 RY5 : VR05R051AS
12. Reed relays (check the posi-
tion of the notch)
RY...
 J4 : PCB tab
This tab serves as square wave out-
put test signal.
13. PCB tab
SK...
J4
 IC15 : UA7805
Mount the regulator like in the
drawing.
 First fix the regulator, then solder
the connections.
14. Voltage regulator.
M3 NUT
LOCK WASHER
M3 BOLT
 J2 : DJ-005
15. DC jack
-
SK... +
SW
 LD: 3mm LED
16. Power indication LED, comes
later through the front panel
LD...
CATHODE
3mm
 J1 : BNC
Carefully solder the connections.
17. BNC connector
Construction
IMPORTANT
Mount this LED exactly like
in the drawing, otherwise
the LED will not fit correctly
in the front panel.

9
 J6 : 25P sub D male
18. 25P sub D connector
R...
5mm
 IC1 : 74F161
 IC3 : OPA2350PA
 IC4 : TDA8703
 IC5 : 6264 ; CY7C199.....EQ
 IC6 : 74HC153
 IC7 : 74F161
 IC8 : 74F161
 IC9 : 74HC595
 IC10 : 74HC85
 IC11 : 74HC595
 IC12 : 74HC595
 IC13 : VK8031 (PAL22V10)
 IC14 : 74HC390
 IC16 : 74HC14
 IC17 : 74HC390
 IC18 : 6N136
 IC19 : 6N136
 IC20 : 6N136
 IC21 : 6N136
 IC22 : 6N136
19. IC’s check the position !
Construction

10
Construction
Cut the screening foil like in the drawing.
 Make sure the conductive side is faced downwards !!
Position the screen foil into the bottom enclosure.
Use some adhesive tape to fix the screen foil
Make sure the conductive side is faced downwards !!
20. Screen foil preparation
Fig. 1.0
80mm
10mm
20mm
Fig. 2.0