>I'm all for safety, don't get me wrong. But if someone is building
something that 
>controls line power, such as the triac control mentioned in AN521, he/she
needs to 
>take precautions building it and fiddling around with it. It doesn't matter
whether 
>there's a PIC in it or not. You don't need to stop designing it when you
decide to put a 
>PIC in it.

But AN521 does not mention a word on safety. And the worst thing is that it 
claims to be more reliable than previously published methods. This is 
really misleading.

"This application note describes a simple method for
measuring parameters from the AC power line.
Parameters such as zero crossing, frequency, and
relative phase can be measured. This method is useful
for measurements on 50, 60, and 400 Hz power
systems with voltages up to several hundred volts. The
method requires only one external component, a
resistor, and is more reliable than previously published
methods using capacitors or bulky, expensive
transformers."

Regards,
Xiaofan
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