Velleman K8003 Dc Controlled Dimmer User Manual

Velleman K8003 Dc Controlled Dimmer User Manual

This small but handy circuit is ideal for replacing an existing dimmer or switch, in order to be able to control a lamp, set of lamps or even a moter via an adjustable DC voltage. One obvious application is control via the K8000 interface board, thanks to its optically isolated input.

Specifications :

• Operating voltages : 24, 110-125 or 220-240VAC 50/60Hz
• Max. load : 3.5A (750W/220V; 380W/110V; 80W/24V)
• Control voltage : 0 to 10VDC
• Max. control current : 2.25mA at 12VDC
• Control voltage and load are optically isolated
• Isolated triac
• Dimensions : 48x74mm (1.9”x2.9”) modifications reserved

Applications :

• Control power circuits with a safe DC voltage
• Ideal for computer interfacing projects (with K8000)
• Adjust lighting, speed of collector motors, …
• Your own unique application

COLOUR CODE

• Black
• Brown
• Red
• Orange
• Yellow
• Green
• Blue
• Purple
• Grey
• White
• Silver
• Gold

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.

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.

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.

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

RESISTORS

• R1 : 4K7 (4 – 7 – 2 – B)
• R2 : 100K (1 – 0 – 4 – B)
• R3 : 100K (1 – 0 – 4 – B)
• R4 : 470K (4 – 7 – 4 – B)
• R5 : 1M (1 – 0 – 5 – B)

Choose operating voltage : For 24VAC :

• R6 : 15K (1 – 5 – 3 – B)
• R7 : 39K (3 – 9 – 3 – B)

For 110-125VAC :

• R6 : 100K (1 – 0 – 4 – B)
• R7 : 220K (2 – 2 – 4 – B)

For 220-240VAC:

• R6 : 220K (2 – 2 – 4 – B)
• R7 : 470K (4 – 7 – 4 – B)

DIODES (Watch the polarity!)

• D1 : 1N4148
• D2 : 1N4148
• D3 : 1N4007

CAPACITORS

• C1 : 4n7 (472)
• C3 : 100nF/250VAC (104 – µ1)
• C4 : 100nF (104 – µ1)

ELECTROLYTIC CAPACITORS (Watch the polarity!)

IC SOCKETS

• IC1 : 6P
• IC2 : 8P

TRIM POTENTIOMETERS

• RV1 : 220K (250K)
• RV2 : 2M (2M5)

SCREW TERMINALS

• J1 : 2P
• J2 : 2 x 2P

POWER RESISTOR

24VAC :

• R8 : 1K5 (1 – 5 – 2 – B)

110-240VAC :

• R8 : 15K

MOUNTING OF THE TRIAC

COIL

• L1 : 50µH/6A

IC’s (Watch the position of the notch)

• IC1 : 4N27 or eq.
• IC2 : TEA1007 or eq.

SET UP

• Connect a digital voltmeter to the PCB in parallel with the load.
• Set both trimpots to the middle of the range of adjustment.
• Switch in the control voltage and the supply voltage.
• Set the control voltage to 0V.
• Adjust RV1 (Min) until the voltmeter reads 0V.
• Set the control voltage to maximum.
• Adjust RV2 (Max) until the voltmeter reads the maximum voltage.
• Repeat both adjustments once again.
• The circuit is now ready for use.

NOTE: In some cases it can be useful to set the minimum level such that
there is a small pre-voltage present, such as for example with stage and
theatre lighting.

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