beier USM-RC-2 Operating Manual page 16

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In order to receive the right cable colors, the ribbon cable must be put on correctly to
the connector. Theoretically it could be put on rotated by 180°; however, the
configuration would be changed in this case. To put the cable on correctly the brown
wire must face upwards (board middle), the black wire downwards (board edge).
The switched voltage at the outputs (if 100% intensity) is always as high, as the
supply voltage of the sound module. For example if the sound module is supplied
with 12V, only lamps with 12V should be connected. If you want to connect LEDs,
series resistors are always required. In addition attention must be paid at LEDs to the
correct polarity. The series resistors for the LED's are depended on the supply
voltage, the LED-color and the LED-current. Modellers familiar with electronics will
certainly be able to calculate the ideal value for the models' LEDs, but everyone else
should refer to the table below, which shows the resistance values required for
standard LEDs (approx. 15mA rating):
Supply voltage
7,2V
8,4V
9,6V
If multiple LEDs are connected to one output (e.g. front and rear direction indicators),
it is always better to use separate dropping resistors than to wire the LEDs in series.
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brown
red
orange
yellow
green
blue
violet
grey
white
black
6V
12V
BEIER-Electronic
Sound module USM-RC-2
Series resistor
270 Ohm
330 Ohm
470 Ohm
510 Ohm
680 Ohm
03.02.2014