Connecting Universal Motors With Hamo-Conversions; Connecting The Speaker; Connecting Several Speakers; Connecting Additional Functions - Esu LokSound micro V4.0 Instruction Manual

Installing the Decoder

6.7.4.2. Connecting Universal Motors with HAMO-Conversions

Do not wire universal motors installed in many older Märklin®
locomotives (also known as AC motors) directly to LokSound de-
coders. You must modify the motor by first installing permanent
magnets – so called HAMO magnets. You may purchase these
magnets from your ESU dealer.
We supply three types of magnets. Please refer to chapter 18.2.
for more information regarding motor conversions with perma-
nent magnets.

6.8. Connecting the Speaker

Every LokSound V4.0 decoder is shipped with an appropriate
loudspeaker that is connected with both the dark brown braids.
Firstly, you need to unsolder the speaker before you install it into
the locomotive. It must be installed in such a way that the sound
waves are not unduly blocked.
Please handle speakers with extreme care: don't apply pressure
or touch the membrane! The speaker's magnets are very pow-
erful! Keep all metal items away and secure the speaker firmly
when soldering. The soldering iron may pull the speaker due
the magnetic field and destroy it.
For LokSound V4.0 decoders you can use loudspeakers (also com-
binations) with a total impendance of 4 – 16 Ohms. We recom-
mend to use the 4 Ohms impendance by ESU as they are tuned to
LokSound V4.0 decoders. However, we advise against using the
previous 100 Ohm impedance speakers since the sound volume
would be too low.
Make sure that you use a small soldering iron (max. 20W) and
only heat the marked contact spots of the speaker. Polarity is not
important. The correct position of the speaker is crucial to achieve
high quality sound. A speaker that is installed without a sound
chamber will not generate good sound. Therefore carefully select
the location and sound chamber for the speaker.

6.8.1. Connecting several speakers

When wiring several speakers, the speaker polarity is important.
If a speaker is wired "backwards" compared to another speaker,
each speaker´s membrane will move in phase opposition. This will
lead to a sound wave cancellation resulting in a very poor and
extremely low sound volume!
As some speakers do not provide any polarity mark, you need
to test the phase position before the final installation of the
speaker!
brown
brown
speaker +
loudspeaker #1
( 8 Ohms )
total impedance resulting in 4 ohms
Figure 9: Parallel wiring of two speakers

6.9. Connecting Additional Functions

You can wire any kind of load such as light bulbs, LEDs (light emit-
ting diodes), smoke generators or similar devices to the function
outputs provided the maximum current draw is less than that of
the decoder output.
The permitted maximum current draw per function output is listed
in chapter 20 under „Technical Data."
speaker - speaker + speaker -
loudspeaker #2
( 8 Ohms)
17