@Paul_B : I really don't know what a snubber is...
However, I think I've learned some things from this thread (thanks again to you all):
-
I have to insert a decoupling ceramic capacitor (100nF) for every shift register close to the vcc of the IC; and I have to leave where it is the electrolytic 10uF capacitor
-
to avoid ssr leakage that lights on the led strip I have two chance:
a) insert a resistor between the AC outputs (correct? which kind?) in parallel with the led strip
b) choose a led strip that requires more corrent draw
Correct?
Thanks for your patience.
Ciao,
Giuseppe