how to measure peak volt of 5v ac cycle?

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s0y

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sir i am new in pic programming i want measure a peak volt value by pic 16f72 adc with 20 mhz crystel without zero crossing interrupt
full bridge rectifier with 100hz. 104pf peak hold cap in circuit
adc volt 2 to 4 volt
i have some questions
1.how to set adc hi-speed for it.
2.how much sample need for it
3.what process is good for it
sir if possible please post here a c code sample
thank you
 

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