Velleman K8089 User manual

Total solder points: 263
Difficulty level: beginner 1 2 3 4 5 ⌧advanced
57mm 7-SEGMENT DIGITAL CLOCK
ILLUSTRATED ASSEMBLY MANUAL H8089IP-1
Large57mmclock&temperaturedisplaywith extra
uniquefeature
K8089
K8089

3
Features & specifications
Features :
 12/24h clock system
 min temp readout:
• celsius: -20°C
• fahrenheit: -4°F
 max temp readout:
• celsius: 70°C
• fahrenheit: 158°F
 auto toggle function
 easy time setting
 easy wall mounting
 back-up battery
 automatic frequency detection
 unique extra feature: auto toggle between time/temp and scrolling sign
'OPEN' or 'CLOSED'
Specifications
• power supply: 12VAC (e.g. PS1205AC)
• power consumption: 250mA max. (incl. temp. sensor*)
• backup battery: 3V (CR2032)
• power consumption on backup battery: +/-1mA
• dimensions: 230x74x32mm / 9 x 2.9 x 1.25"
* optional : temperature sensor K8067 or VM132

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
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*
0.000

5
⇒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
surface 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 !

6
Construction
 R1 : 100K (1 - 0 - 4 - B)
 R2 : 10 (1 - 0 - 0 - B)
 R3 : 22K (2 - 2 - 3 - B)
 R4 : 22K (2 - 2 - 3 - B)
 R5 : 240 (2 - 4 - 0 - 0 - 1)
 R6 ... R37 : 220 (2 - 2 - 1 - B) !
 R38 : 1K (1 - 0 - 2 - B)
 R39 ... R42 : 10K (1 - 0 - 3 - B) !
 R44 : 220 (2 - 2 - 1 - B)
 R45 : 2K2 (2 - 2 - 2 - B)
 R46 : 10K (1 - 0 - 3 - B)
1. Resistors.
R...
Hint: if you want the mount the clock against a wall, you can use the unstuffed
PCB as a template to mark the drill holes.
 D1 : 1N4007
 D2 : 1N4007
 D3 : 1N4007
 D4 : 1N4007
 D5 : BAT85
 D6 : BAT85
 D7 : 1N4148
2. Diodes (check the polarity)
CATHODE
D...
 ZD1 : 4V3
 ZD2 : 4V3
 ZD2 : 4V3
 ZD3 : 4V3
3. Zener diodes (check the polarity)
CATHODE
ZD...
Hint: resistors can be soldered at
component side of the board.
 IC1 : 14p
 IC2 : 16p
 IC3 : 16p
 IC4 : 16p
 IC5 : 16p
4. IC sockets. Watch the position
of the notch!
IC...
1
 C1 ... C11 : 100nF (104)
 C13 : 100nF (104)
5. Capacitors
c...
 SW1 : Open / closed
6. Switches
SW1.
Hint: mount a screw connector if remote
selection is needed, see step 12.

7
Construction
 T1 : BC547
 T2 : BC547
7. Transistors
T1
 VR1: UA7808
 VR2: UA78L05
8. Voltage regulator
 SW2 : Sign on/off
 SW3 : Hours +
 SW4 : Minutes +
10. Push buttons
 E1 : CR2032 (3V)
9. Battery holder

SK1 : 2p power 12VAC
 SK2 : 3p Temp. sensor
! If remote selection is needed :

SW1 :2p Open/closed
12. Terminal blocks
 C12 : 470µF / 25V
13. Electrolytic capacitor.
Watch the polarity !
C...
-
VR...
 IC1 : VK8089
(programmed PIC16F630-I/P)
 IC2 : 74HC595
 IC3 : 74HC595
 IC4 : 74HC595
 IC5 : 74HC595
15. IC's. Watch the position of the
notch!
2pins:
 SK3 : 12h/24h
 SK4 : °C/°F
 SK5 : Clock/clock+temp
3pins:
 hh:mm / hh.mm
11. Pinheaders
Make sure that the heat sink does
not touch C12 !
14. Heat sink

8
Construction
 DY1 : 2 x 5pins
 DY2 : 2 x 5pins
 DY3 : 2 x 5pins
 DY4 : 2 x 5pins
1. Tulip pin headers
MOUNT THESE COMPONENTS ON THE PCB SOLDERSIDE, SOLDER
THEM ON THE COMPONENTS SIDE
DY1DY2DY3DY4
5pins
Cut8x5pins
SOLDER SIDE

9
construction
CATHODE
 DY1
 DY2
 DY3
 DY4
Make sure that all displays are
correctly mounted !
2. Digit displays
ATTENTION: mount the displays so that the
dot is mounted towards the push button.
DY1DY2DY3DY4
Side with push buttons
3. Assembly of the enclosure
1 Mount the leds, watch the polarity.
display display

10
Construction
4. Test and connection
1. Power supply:
Supply 9-12VAC to the inputs marked '12VAC'.
 Make sure supply can deliver 300mA
 Make sure to use an AC power supply. If you supply a DC voltage, the
accuracy of the clock will be 5% worst case.
2. Back-up battery:
Insert a 3V CR2032 battery in the battery holder. If power
fails, unit will retain the clock. Display will remain blank.
Note: Accuracy when running on backup battery: 5%
worst case. Consumption: +/- 1mA
 CHECK IF THE CLOCK IS WORKING CORRECTLY (see page 13)
5. Optional temperature sensor
If you have ordered an additional temperature sensor K8067
or VM132 then you can let the temperature automatic toggle
with the time and sign.
Connect the terminals marked GND, V+ and IN to the corresponding terminals of
the temperature sensor. As this is a current loop sensor, you can run several
meters of wire between the sensor and the clock.
Optional temperature sensor