Hi Henrik.

You are right about the power mosfet, but the schematic was ready from another project. I mentioned that, so one can of course select a lower amp one.

I just needed the low Rds for my project. P-Mosfets with low Rds, are hard to find.

The idea of optocoupler is great! Vishay SFH619A is 125mA capable and sure there must be stronger devices.

Ioannis