Velleman VM151 - Manual (Page 4)

4
Connection
CONNECTION
LED-strip with common anode (+) :
Connect the common anode to the (+) of the 12VDC
power supply.
Connect the cathode (-) of each colour to the (-) of
R,G or B on the VM151.
Max. current consumption is 3A/channel.
12VDC
- +
12VDC
- +
COM R G B
Incandescent lightbulb or halogen lightbulb:
connect the lightbulb to the output R, G or B.
Polarity is not important. 3A /channel max (36W@12V).
LED
LEDs require a series resistor
Determine led voltage drop (Check manufacturer datasheet).
Rule of thumb: red: 1.7V, green: 2V, blue: 3..4V).
Next, check required LED current.
Example: Red LED, 1.7V drop, required current: 20mA
Resistor calculation: (12V-1.7V) / 0.020 = 515 ohm (choose nearest value, e.g. 560 ohm)
Resistor power rating calculation: (12V-1.7V) x (12V-1.7V) / 560 = 0.19W (choose a 0.25W resistor)
C (-)
A (+)
12VDC
- + + +
HVM151G'1_rev2.pub
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Wednesday, April 15, 2009 11:08