tams elektronik LC Series Manual page 29

LC modules
Example: Connection of 2 blue and 3 red LEDs with using a 18 V a.c.
transformer. Designated current: 20 mA:
nec. R = (25 V – 4 V x 2 – 2 V x 3) / (20 mA x 0,001) = 550 Ohm
V
We choose the next resistor´s value which is provided as a standard,
which means a resistor of 560 Ohm. If using a resistor with a higher
value the current of the LEDs would be reduced and the LEDs would
light less brightly.
Tip: Connecting many LEDs to one LC module
If you want to connect a great number of LEDs to one LC module (e.g.
with advertising lights or funfair lights), best connect them as follows:
Connect so many LEDs in series as possible with the available
operating voltage. When using an a.c. transformer of 18 V you can
connect 7 white or blue or 11 different coloured LEDs in series.
Reduce the current by using a series resistor as far as the LEDs´
brightness still matches your ideas.
Connect further "chains" of LEDs switched in series in parallel to the
same output. Take care not to exceed the max. current of 100 mA.
When limiting the current of each single "chain" to 10 mA, you can
connect 10 chains in parallel to one output.
You can do the same with the other 4 outputs. Based on our example
you can connect:
5 x 10 x 7 = 350 white or blue LEDs or
5 x 10 x 11 = 550 different coloured LEDs to one module!
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Page 29