All of the PIC inputs have protection diodes so all you need is a current limiting resistor. Look at the Microchip AN236 (p3& p20) which uses just a 5meg resistor to get ZC from the 120VAC powerline.
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Re: Zero cross detect - switching audio
All of the PIC inputs have protection diodes so all you need is a current limiting resistor. Look at the Microchip AN236 (p3& p20) which uses just a 5meg resistor to get ZC from the 120VAC powerline.
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