User manual

tams elektronik
English LKS-1
 Cut the wires after soldering directly above the soldering joint with a
side cutter.
 After placing the parts, please double check for correct polarity.
Check the PCB tracks for solder bridges and short circuits created by
accident. This would cause faulty operation or, in the worst case,
damage. You can remove excess solder by putting a clean soldering
tip on the spot. The solder will become liquid again and flow from
the soldering spot to the soldering tip.
4. Operation overview
LEDs are most suitable as a lighting for locomotives and carriages. But
there are some snags with this apparently simple solution:
 On analoque layouts the LEDs light the brighter the higher the
voltage is (i.e. the faster the locomotive is driving).
 With digital layouts this problem does not occur as there is a
constant voltage at the rails. But LEDs with series resistors figured
up for 18 V d.c. voltage light in layouts supplied with 12 V too dark
and with 24 V too bright.
By use of the LED constant current source LKS-1 you can solve these
problems. A transistor ensures, that during operation a constant current
of approximately 25 mA is available.
This allows LEDs to be connected directly without series resistors. They
have a constant brightness after reaching the required minimum voltage,
independent from the voltage supplied. The minimum voltage for blue
and white LEDs is approx. 4 V, for different-coloured LEDs approx. 3 V.
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