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Ac signal amplifier**strong text**

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In the above schematic I have reduced my negative voltage in the op amp , so that I get output voltage from 0 to 5v, otherwise I am getting the voltage from negative side. please suggest me the right solution for this circuit. As I was confusing for a long period.as also ringing waveform is occuring. I need output waveform starting from 0 to 5V.(input is 3.3VAC)

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    \$\begingroup\$ The output's capacitor, C4, isn't a coupling capacitor. It forms a low-pass filter with R7. \$\endgroup\$ – TonyM Sep 12 at 6:23
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    \$\begingroup\$ Do you really need to use an amplifier, or do you just need to convert a 3.3V digital signal to a 5V digital signal? A single transistor will do the job if all you need is to convert a digital signal. \$\endgroup\$ – JRE Sep 12 at 6:26
  • \$\begingroup\$ yes, if i place the coupling capacitor at the output terminal, there is no proper output. it came as irregular circuit. please suggest me the proper circuit. \$\endgroup\$ – kavi.krishna Sep 12 at 6:27
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    \$\begingroup\$ Look up "level shifter" for a simple solution. Ac signal implies sinusoidals, whereas your fpga is likely digital ... Yes? \$\endgroup\$ – Soldersmoke Sep 12 at 6:41
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    \$\begingroup\$ Your whole system will fall apart if the signal frequency gets lower and definitely will not work for static signals. As others have stated above: look for level snifters. Also (I was a long time ago I looked at this) check your levels. A 3V3 CMOS output can often still drive a 5V input if the input has TTL levels. That was the main reason why 3V3 was chosen in the past: it could work with the, then established, TTL I/O levels. \$\endgroup\$ – Oldfart Sep 12 at 6:53

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