almost a year passed by since my last post, that must be a record!
Sorry, but I had a few other project with higher priority in the meantime, for example my second daughter ...
Unfortunately, my softstart circuit still does not work. I measured again and I think I can imagine where the problem is. I have round about 30V AC between R9 and Neutral, but only 15,6V DC across DZ1. I wonder, why K1 is even switching? The specs of this kind of relays require between 17,5 and 36 Volts to work. Across D4 there are only 12V, so it is clear that K2 is not switching.
The question is: why do I have only 15,6V after B1 rectifying the voltage? How can I increase the AV Voltage before B1? I think I should have at least 40V AC to get 20V DC after B1. I desoldered C1 (220nF) to see what happens, but the voltage stayed the same.
Do you have an idea?