English
Locomotive decoders of the series 30 plus
6.14. Connecting a loudspeaker
Use a loudspeaker with an impedance of at least 4 Ohm. When
connecting a loudspeaker with a lower impedance, the output for the
loudspeaker will be damaged. As a rule the playback quality increases
with the loudspeaker´s size. For that reason you should choose a
loudspeaker as large as possible.
In addition, the correct mounting of the loudspeaker is decisive for the
sound reproduction. The loudspeaker membrane should emit directly to
the outside, the other side into the inside of the vehicle which should
be as airtight as possible. The larger the volume in the inside, the
better is the reproduction quality. Suitable for the mounting are e.g. the
bottom of the vehicle or the back of the driver´s cab.
Clearing disturbances of the sound reproduction
As a matter of principle the sound playback can be distorted or
disturbed by a high whistling noise. In this case you should solder a
suppression choke (> 470 µH / 90 mA) into one of the supply wires of
the loudspeaker (except with the LD-G-36 plus).
Disturbing noises can occur with a bad current draw (e.g due to dirty
rails or at points) and with RailCom switched on. You can remedy these
disturbances by mounting a buffer capacitor.
6.15. Connecting a buffer capacitor
In sections with bad contact to the rails the power supply of the
decoder can be interrupted. Possible consequences are e.g. flickering
lighting or disturbing noises from the loudspeaker. In these and similar
cases you can find a remedy by connecting a buffer capacitor.
The electrolytic capacitor should have a capacity of minimum 100 µF
(LD-G-31 plus) or 220 µF and a proof voltage of minimum 25 V. When
used in analogue a.c. layouts, a voltage of minimum 35 V is required.
Observe the correct polarity when connecting the capacitor!
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