57mm 7-SEGMENT DIGITAL CLOCK mperature display Large 57mm clock & te re with extra unique featu Total solder points: 263 Difficulty level: beginner 1 2 3 4 5 advanced K8089 ILLUSTRATED ASSEMBLY MANUAL H8089IP-1
VELLEMAN NV Legen Heirweg 33 9890 Gavere Belgium Europe www.velleman.be www.velleman-kit.
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.
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. apply • Wipe it often on a wet sponge or cloth, to keep it clean; then 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.
REMOVE THEM FROM THE TAPE ONE AT A TIME ! DO NOT BLINDLY FOLLOW THE ORDER OF THE COMPONENTS ONTO THE TAPE.
Construction 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. 1. Resistors. 3. Zener diodes (check the polarity) ZD1 : 4V3 ZD2 : 4V3 ZD2 : 4V3 ZD3 : 4V3 R... Hint: resistors can be soldered at component side of the board. R1 R2 R3 R4 R5 : 100K : 10 : 22K : 22K : 240 (1 - 0 - 4 - B) (1 - 0 - 0 - B) (2 - 2 - 3 - B) (2 - 2 - 3 - B) (2 - 4 - 0 - 0 - 1) R6 ...
Construction 7. Transistors 12. Terminal blocks T1 : BC547 T2 : BC547 T1 SK1 : SK2 : 2p power 12VAC 3p Temp. sensor 8. Voltage regulator ! If remote selection is needed : VR1 : SW1 : 2p UA7808 Open/closed 13. Electrolytic capacitor. Watch the polarity ! C... C12 : 470µF / 25V - VR2 : UA78L05 VR... 14. Heat sink Make sure that the heat sink does not touch C12 ! 9. Battery holder E1 : CR2032 (3V) 10.
Construction MOUNT THESE COMPONENTS ON THE PCB SOLDERSIDE, SOLDER THEM ON THE COMPONENTS SIDE 1.
construction 2. Digit displays DY1 DY2 DY3 DY4 ATTENTION: mount the displays so that the dot is mounted towards the push button. Side with push buttons 1 DY 2 DY 3 DY 4 DY Make sure that all displays are correctly mounted ! 3. Assembly of the enclosure 1 Mount the leds, watch the polarity.
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.
Optional sensor K8067/VM132 K8089 Adjusting the temperature sensor (Skip this if there is no temp. sensor connected. In this case, make sure jumper is set to 'clock'). Put a reliable thermometer next to the temperature sensor and leave it there for a while. Press and hold 'Min'-button and apply power to the unit. The unit will display the temperature only (Make sure back-up battery is removed) Adjust the multiturn pot.
Jumper setting jumper, to select how seconds are indicated. hh.mm hh:mm hh mm 7. Assembly in enclosure 1 Assemble the 4 individual housing together. 2 Turn the PCB around with the displays on top, place the enclosure on the PCB.
Use 8. Use Minute 'Min' Hour 'Hrs' Mode Message select 1. Use as thermometer only (no clock): Hold 'Min'-button and apply power. Unit will display temperature only. If required, you can permanently bridge the 'Min'-button. 2. Setting the time: Select 12h or 24h readout by means of the jumper. Press 'Hrs' to set the hours, press 'Min' to set minutes. At release, seconds will start from zero. 3. Turning on/off the 'OPEN'/'CLOSED' display.
PCB PCB 14
R6 R7 R8 R9 R10 R11 R12 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 R30 R31 R32 R33 R34 R35 R36 Schematic diagram Schematic diagram
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