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A comment on System separation in the Continental Europe Synchronous Area on 8 January 2021. Parent comment

Re:System separation in the Continental Europe Synchronous A... by klodolph on Tuesday January 26, 2021 @02:03PM (#25919825)
You don’t need an optocoupler to measure grid frequency. You can just use a resistor. Dirt cheap, cheaper than a crystal.
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Re:System separation in the Continental Europe Synchronous A... by garaetjjte on Tuesday January 26, 2021 @03:34PM (#25920724)
Yes, but OP talked about isolated circuits. It's likely that most appliances don't need to be isolated though.
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Re:System separation in the Continental Europe Synchronous A... by klodolph on Tuesday January 26, 2021 @10:51PM (#25924028)
OP was talking about consumer circuits, I think they were mistaken about how likely they are to be isolated.
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