The 60905 decoder is about the same size as a normal 6090x decoder, a bit wider at the bottom though... Have you considered a LokPilot as an alternative? The 60905 is a decoder developed for DC can motors, and especially Faulhaber-type of motors. It is possible that you would do just as fine with a 60902, LokPilot or such. Those who have done this conversion can maybe tell us more...

However, the "Leiterplatte" also houses the diode logic for the Swiss lighting scheme as I understand, so you will have to make your own diode bridge if you wish the lighting to be prototypical by default. The tail light can of course be controlled by a function if you wish to do it that way...

Has anyone made their own "Swiss lighting" diode circuit when digitizing a loco of Swiss prototype? If so, a schematic would certainly be very welcome here...

Nice addition to your rolling stock! Railcars are always fun ... they don't need much space. Usually they go in both directions and don't even need switching. And in this case it even looks good!

/K-G

Hi Peter, all,
I´ve got your loco´s sister, the Blauer Pfeil (3127). I gave her a lokpilot, and believe me, it works really fine. It´s just another option. I conected it straight to the can motor but, sorry, I´ve got no answer to achieve the Swiss lighting scheme[V]. I´m very interested in this question too.

Hi all,
Did it work?

Hi all,
Here is a straightforward scheme for Swiss lighting.



It is quite simple to understand: starting at the left lower corner, when the grey wire is switched to (-) by the decoder, current will flow from orange (+) through all 3 leds at the front, but also through the single right led at the rear, via "y" and "z".
If one would omit the diode at the right side, current would now also flow through the rear top and left led, down via 'x' and then upward and via "z", to the grey wire. This explains the function of the diode.


The scheme posted by Gregor earlier is a dedicated scheme for the exceptional event of using double traction with 2 Swiss locs.
Basically, in that scheme, only the rear lights (L2 and L3) are switched by the grey and yellow wires, and, as usual, they may be switched off by F0.
The front lights have to be switched on and off manually, by F1 (front) or F2 (rear).
As you may see, the red & brown F1 wire draws current through both the right light (L2) and through L1, which represents the top and left light. (Older Swiss Mä locs have a single light bulb for the top and left light, and a separate one for the right light).
Thus, the front lights have to be switched on and off manually while changing direction. However, the advantage is that all lighting combinations for double traction may be made.

The diodes connected to the grey and yellow wires prevent other lights to go on (as described for the simple scheme above). To me, it appears that the diodes near L1 and L4 are not required; they probably have been added to cause a similar voltage reduction for all light bulbs, so that the brightness does not differ.

Thanks all for your contribution in this old thread, I plan to try Bart's schema. However, I have a few questions about the components required:

With reference to http://www.elfa.se , which diodes are appropriate? The 1N4001 or 1N4001G or something else?

How about the "1k" and "1.2k" components in the scheme, are these resistors? Which article N.o. would be approporiate?

Peter

Thanks, Perz!

Peter