Velleman K3400 Dual Electronic Dice - Illustrated Assembly Manual

Model: K3400

Features & Specifications

Features:

Two independent dice.
Use a single or both dice at the same time.
Display auto shut-off saves battery power.
Low power consumption.

Specifications:

Power supply: 8-12VDC or 6VAC.
Idle power consumption: 1mA.
Power consumption both dice on: 60mA.
PCB dimensions: 76 x 70mm (3.0" x 2.8")

Assembly Hints

1. Assembly (Skipping this can lead to troubles !)

Read these hints carefully to make this project successful.

1.1 Make sure you have the right tools:

A good quality soldering iron (25-40W) with a small tip.
Wipe the soldering iron tip 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, enabling 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 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:

Mount the component against the PCB surface and carefully solder the leads.
Make sure the solder joints are cone-shaped and shiny.
Trim excess leads as close as possible to the solder joint.

REMOVE THEM FROM THE TAPE ONE AT A TIME!

AXIAL COMPONENTS ARE TAPED IN THE CORRECT MOUNTING SEQUENCE !

Construction

1. Jumpers

J: 2x

2. Diodes. Watch the polarity!

D1: 1N4148
D2: 1N4007

3. 1/4W Resistors

R1: 4K7 (4 - 7 - 2 - B)
R2: 470K (4 - 7 - 4 - B)
R3: 47K (4 - 7 - 3 - B)
R4: 47K (4 - 7 - 3 - B)
R5: 47K (4 - 7 - 3 - B)
R6: 47K (4 - 7 - 3 - B)
R7: 47K (4 - 7 - 3 - B)
R8: 47K (4 - 7 - 3 - B)
R9: 47K (4 - 7 - 3 - B)
R10: 47K (4 - 7 - 3 - B)
R11: 47K (4 - 7 - 3 - B)
R12: 47K (4 - 7 - 3 - B)
R13: 47K (4 - 7 - 3 - B)
R14: 47K (4 - 7 - 3 - B)
R15: 47K (4 - 7 - 3 - B)
R16: 47K (4 - 7 - 3 - B)
R17: 47K (4 - 7 - 3 - B)
R18: 47K (4 - 7 - 3 - B)
R19: 47K (4 - 7 - 3 - B)
R20: 47K (4 - 7 - 3 - B)
R21: 47K (4 - 7 - 3 - B)
R22: 47K (4 - 7 - 3 - B)
R23: 47K (4 - 7 - 3 - B)
R24: 47K (4 - 7 - 3 - B)
R25: 47K (4 - 7 - 3 - B)
R26: 47K (4 - 7 - 3 - B)
R27: 47K (4 - 7 - 3 - B)
R28: 47K (4 - 7 - 3 - B)
R29: 47K (4 - 7 - 3 - B)
R30: 680 (6 - 8 - 1 - B)
R31: 680 (6 - 8 - 1 - B)
R32: 470 (4 - 7 - 1 - B)
R33: 470 (4 - 7 - 1 - B)
R34: 470 (4 - 7 - 1 - B)
R35: 470 (4 - 7 - 1 - B)
R36: 470 (4 - 7 - 1 - B)
R37: 470 (4 - 7 - 1 - B)

4. IC sockets. Pay attention to the position of the notch!

IC1: 16p
IC2: 16P
IC3: 14P

5. Capacitors

C1: 390pF (391)
C2: 470pF (471)

6. Transistors

T1: BC547B
T2: BC547B
T3: BC547B
T4: BC547B
T5: BC547B
T6: BC547B
T7: BC547B
T8: BC547B
T9: BC557B

7. PCB pins

+: Pin
VD: Pin
- : Pin
PB (2x): Pin
VD1: Pin
VD2: Pin

8. Electrolytic capacitors. Watch the polarity!

C3: 100μF
C4: 100μF

Pay attention to the polarity! As to the height of the leds, take into account the housing that will be used.

Mount them high enough anyway to make them overtop all other components. The leds must all stand upright and be at the same height.

9. LED's. Watch the polarity!

LD1: 3mm red
LD2: 3mm red
LD3: 3mm red
LD4: 3mm red
LD5: 3mm red
LD6: 3mm red
LD7: 3mm red
LD8: 3mm red
LD9: 3mm red
LD10: 3mm red
LD11: 3mm red
LD12: 3mm red
LD13: 3mm red
LD14: 3mm red

10. IC's. Pay attention to the notch!

IC1: 4022
IC2: 4022
IC3: 4093

Pay attention to the position of the notch!

Connection & test

11. Connection & test

The push button (single pole normally open contact) has to be connected to the points PB.

Display selection is done by connecting VD1 respectively VD2 to VD.

You can make these connections permanent, or use a bipolar three position slide switch as shown in the connections diagram. In this case the slide switch functions as selector and on/off- switch at the same time.

The power supply has to be connected to the points + and -. At choice you can use a 9V battery, a 8 to 12V power supply, or a 6V transformer.

For testing you select both displays.

Push the button. As long as you push, the leds all burn feebly. This is because the dice are 'rolling'. Cheating is out of the question, thanks to the very high and different speeds of both dice.

The result appears as soon as you release the button.

After about half a minute displays are switched off, so that current consumption is reduced to less than 1mA.

Connection example

A diagram shows the connection of a 9V battery to the PCB, along with a push button and a slide switch. The PCB has various components labeled, including IC1, IC2, IC3, transistors (T1-T8), resistors (R1-R37), capacitors (C1-C4), diodes (D1-D2), and LEDs (LD1-LD14). The diagram illustrates how to connect the power supply, the push button, and a slide switch for selecting displays and on/off functionality.

USE A SLIDE SWITCH (ON OFF ON)

Schematic diagram

The schematic diagram shows the electronic circuit for the dual electronic dice. It includes integrated circuits (IC1, IC2, IC3), transistors (T1-T9), resistors (R1-R37), capacitors (C1-C4), diodes (D1-D2), and LEDs (LD1-LD14). The diagram details the connections between these components, including power supply (+V), ground (EOSC), push button (PB), and display selection points (VD, VD1, VD2).

PCB Layout

The PCB layout diagram illustrates the physical placement of all components on the printed circuit board. It shows the positions of LEDs (LD1-LD14), transistors (T1-T8), resistors (R1-R37), IC sockets (IC1-IC3), capacitors (C1-C4), diodes (D1-D2), jumpers (J), and connection points (PB, VD, VD1, VD2, +).

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