Hey Everyone,
I need to be able to sample an AC voltage and have a chip determine the peak value from this AC voltage, Say it runs at 40hZ for example.
What is a good IC chip that can read in the AC voltage and output the results to an op-amp for control? I need a chip that can stand at least 8 volts AC. One that ships fast and easy preferably.
You normally build a peak detector with an op amp or two and a capacitor. Just google peak detector and select images, there are lots to chose from.
Normally, we use a diode to select the peak to measure and a capacitor to hold the peak voltage.
A load resistor will discharge the capacitor slowly or you can use a transistor to do that faster.
krackyz:
I need to be able to sample an AC voltage...
You answered your own question.
Sample the AC wave with the Arduino, and let it calculate peak/peak value in software.
You ofcourse need to drop that 8volt AC down to <= 5volt p/p, and bias it mid-voltage.
Leo..