Yet another problem solved. I did many things with current transformer as now without any opto isolator wich are working really great. But i guess it's still a good practice... safer but not cheaper
Many more turn on te secondary will cure the problem but you can also use an opamp to raise the voltage and filter the signal in the same package too. Voltage comparator could be another way and will act as a buffer.
As always... endless possibility are in your hands]
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