Op-amp problem...please help!!

B

Beyond014

n00b
Joined
Jul 1, 2008
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Does anyone know how to rectify an AC voltage with DC offset (2.5V)? I need to keep the DC offset voltage in order to do the comparison. My input is an AC signal with 2.5 VDC offset, I tried to set the reference voltage at 2.5 Vdc, but I don't know how. Thanks.
 
You can either AC couple the AC signal to remove the DC offset, or you could build a 2.5V reference voltage for your comparator using a Zener diode. I'm assuming you're trying to flip the comparator output when the AC signal is above 2.5V, and vice versa?
 
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