Motorola FD-1 - Manual (Page 11)

FD-1 English
Page 25
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!
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! Caution:
The current consumption of all connected accessories may not exceed
1.000 mA!
You can connect the second side of the lamps and the accessories either
to the return conductor of the corresponding output or to ground. If
connecting the accessory to ground you must solder in a diode.
Caution:
The return conductors must under no circumstances be connected to
ground. Possible short circuit! The decoder will be damaged in
operation.
Tip: If the second side of the lamps is connected to ground the lamps
often flicker in operation. You can avoid the flickering of the lamps if
you connect the second side to the return conductor of the
corresponding output instead of ground.
Caution:
If you connect the load to the return conductor the load must be
insulated. The loads must not make contact with metal parts of the
locomotive or the carriage. Possible short circuit! The decoder will be
damaged in operation.
Connecting the LEDs
The function outputs of the decoder switch against decoder ground. For
that reason you must connect the cathode (-) of the LED to the output
of the relevant function.
Caution:
If you use light-emitting diodes (LEDs) you must always operate them
via a series resistor.
LEDs are available in many different models. There are LEDs with 2-5
mA, but also LEDs with 15-30 mA power consumption. The series
resistor limits the current flow of the LED and will need to be calculated
for each model. Ask for the max current rating when buying your LEDs.