Thank You Mark. In fact a "filtering" capacitor could be a buffer (that's approximately what happens with Your Rokuhan controllers). With the Kato system, the capacitor is charged directly through the coil. The only solution, as You wrote, would be a BIG filtering capacitor connected to the output of the power supply, charged through a resistor. But it's not necessary : a 7.5V, 6A switching power supply costs less than 19 Euro (less than a CHEAP freight car). So, where would be the advantage ? And I would have to wait several seconds before I could flip other turnouts ; this will not happen with "direct" power supply, I think I can flip turnouts every 0.5sec.
Last Edit: Jul 8, 2017 17:40:41 GMT -5 by alberich