Actually, I note the following idea for a long time. But again it's on me that I overlooked: The wiring of switches (whether analog or digital) you can actually save quite nice, if you think about it, which logically points related.
The figure below shows the top left (switch 116 a and b) the obvious version: With a track change, both switches must be set to either straight on or turnoff. It therefore makes sense they want with a switch (or a decoder address).
obviously not quite so - and therefore easily overlooked - is the other variant, as shown in the picture in giving 131 and 104. In these cases, the course always want to against same : Does a straight W 104, 104 may then lead b not straight. 104 is switched on but a branch, must be 104 b on straight. Analog at 131 a and b.
If it can be saved in the digital system has a decoder, the not insignificant financially from!
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